pch.c revision 328147
1246074Sgabor/*- 2246074Sgabor * Copyright 1986, Larry Wall 3246074Sgabor * 4246074Sgabor * Redistribution and use in source and binary forms, with or without 5246074Sgabor * modification, are permitted provided that the following condition is met: 6246074Sgabor * 1. Redistributions of source code must retain the above copyright notice, 7246074Sgabor * this condition and the following disclaimer. 8246074Sgabor * 9246074Sgabor * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10246074Sgabor * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11246074Sgabor * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12246074Sgabor * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13246074Sgabor * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14246074Sgabor * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15246074Sgabor * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16246074Sgabor * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17246074Sgabor * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18246074Sgabor * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19246074Sgabor * SUCH DAMAGE. 20246074Sgabor * 21246074Sgabor * patch - a program to apply diffs to original files 22246074Sgabor * 23246074Sgabor * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24246074Sgabor * behaviour 25246074Sgabor * 26275582Spfg * $OpenBSD: pch.c,v 1.43 2014/11/18 17:03:35 tobias Exp $ 27246091Sdelphij * $FreeBSD: stable/11/usr.bin/patch/pch.c 328147 2018-01-18 21:46:42Z kevans $ 28246074Sgabor */ 29246074Sgabor 30246074Sgabor#include <sys/types.h> 31246074Sgabor#include <sys/stat.h> 32246074Sgabor 33246074Sgabor#include <ctype.h> 34246074Sgabor#include <libgen.h> 35246074Sgabor#include <limits.h> 36281800Spfg#include <stdint.h> 37246074Sgabor#include <stdio.h> 38246074Sgabor#include <stdlib.h> 39246074Sgabor#include <string.h> 40246074Sgabor#include <unistd.h> 41246074Sgabor 42246074Sgabor#include "common.h" 43246074Sgabor#include "util.h" 44246074Sgabor#include "pch.h" 45246074Sgabor#include "pathnames.h" 46246074Sgabor 47246074Sgabor/* Patch (diff listing) abstract type. */ 48246074Sgabor 49275553Spfgstatic off_t p_filesize; /* size of the patch file */ 50246074Sgaborstatic LINENUM p_first; /* 1st line number */ 51246074Sgaborstatic LINENUM p_newfirst; /* 1st line number of replacement */ 52246074Sgaborstatic LINENUM p_ptrn_lines; /* # lines in pattern */ 53246074Sgaborstatic LINENUM p_repl_lines; /* # lines in replacement text */ 54246074Sgaborstatic LINENUM p_end = -1; /* last line in hunk */ 55246074Sgaborstatic LINENUM p_max; /* max allowed value of p_end */ 56246074Sgaborstatic LINENUM p_context = 3; /* # of context lines */ 57246074Sgaborstatic LINENUM p_input_line = 0; /* current line # from patch file */ 58246074Sgaborstatic char **p_line = NULL;/* the text of the hunk */ 59267490Spfgstatic unsigned short *p_len = NULL; /* length of each line */ 60246074Sgaborstatic char *p_char = NULL; /* +, -, and ! */ 61246074Sgaborstatic int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 62246074Sgaborstatic int p_indent; /* indent to patch */ 63275553Spfgstatic off_t p_base; /* where to intuit this time */ 64246074Sgaborstatic LINENUM p_bline; /* line # of p_base */ 65275553Spfgstatic off_t p_start; /* where intuit found a patch */ 66246074Sgaborstatic LINENUM p_sline; /* and the line number for it */ 67246074Sgaborstatic LINENUM p_hunk_beg; /* line number of current hunk */ 68246074Sgaborstatic LINENUM p_efake = -1; /* end of faked up lines--don't free */ 69246074Sgaborstatic LINENUM p_bfake = -1; /* beg of faked up lines */ 70246074Sgaborstatic FILE *pfp = NULL; /* patch file pointer */ 71246074Sgaborstatic char *bestguess = NULL; /* guess at correct filename */ 72246074Sgabor 73246074Sgaborstatic void grow_hunkmax(void); 74246074Sgaborstatic int intuit_diff_type(void); 75275553Spfgstatic void next_intuit_at(off_t, LINENUM); 76275553Spfgstatic void skip_to(off_t, LINENUM); 77246074Sgaborstatic size_t pgets(bool _do_indent); 78246074Sgaborstatic char *best_name(const struct file_name *, bool); 79246074Sgaborstatic char *posix_name(const struct file_name *, bool); 80246074Sgaborstatic size_t num_components(const char *); 81275612Spfgstatic LINENUM strtolinenum(char *, char **); 82246074Sgabor 83246074Sgabor/* 84246074Sgabor * Prepare to look for the next patch in the patch file. 85246074Sgabor */ 86246074Sgaborvoid 87246074Sgaborre_patch(void) 88246074Sgabor{ 89246074Sgabor p_first = 0; 90246074Sgabor p_newfirst = 0; 91246074Sgabor p_ptrn_lines = 0; 92246074Sgabor p_repl_lines = 0; 93246074Sgabor p_end = (LINENUM) - 1; 94246074Sgabor p_max = 0; 95246074Sgabor p_indent = 0; 96246074Sgabor} 97246074Sgabor 98246074Sgabor/* 99246074Sgabor * Open the patch file at the beginning of time. 100246074Sgabor */ 101246074Sgaborvoid 102246074Sgaboropen_patch_file(const char *filename) 103246074Sgabor{ 104246074Sgabor struct stat filestat; 105252636Sobrien int nr, nw; 106246074Sgabor 107246074Sgabor if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 108246074Sgabor pfp = fopen(TMPPATNAME, "w"); 109246074Sgabor if (pfp == NULL) 110246074Sgabor pfatal("can't create %s", TMPPATNAME); 111252636Sobrien while ((nr = fread(buf, 1, buf_size, stdin)) > 0) { 112252636Sobrien nw = fwrite(buf, 1, nr, pfp); 113252636Sobrien if (nr != nw) 114252636Sobrien pfatal("write error to %s", TMPPATNAME); 115252636Sobrien } 116246074Sgabor if (ferror(pfp) || fclose(pfp)) 117246074Sgabor pfatal("can't write %s", TMPPATNAME); 118246074Sgabor filename = TMPPATNAME; 119246074Sgabor } 120246074Sgabor pfp = fopen(filename, "r"); 121246074Sgabor if (pfp == NULL) 122246074Sgabor pfatal("patch file %s not found", filename); 123275553Spfg if (fstat(fileno(pfp), &filestat)) 124275553Spfg pfatal("can't stat %s", filename); 125246074Sgabor p_filesize = filestat.st_size; 126275553Spfg next_intuit_at(0, 1L); /* start at the beginning */ 127246074Sgabor set_hunkmax(); 128246074Sgabor} 129246074Sgabor 130246074Sgabor/* 131246074Sgabor * Make sure our dynamically realloced tables are malloced to begin with. 132246074Sgabor */ 133246074Sgaborvoid 134246074Sgaborset_hunkmax(void) 135246074Sgabor{ 136246074Sgabor if (p_line == NULL) 137267464Spfg p_line = malloc(hunkmax * sizeof(char *)); 138246074Sgabor if (p_len == NULL) 139267490Spfg p_len = malloc(hunkmax * sizeof(unsigned short)); 140246074Sgabor if (p_char == NULL) 141267464Spfg p_char = malloc(hunkmax * sizeof(char)); 142246074Sgabor} 143246074Sgabor 144246074Sgabor/* 145246074Sgabor * Enlarge the arrays containing the current hunk of patch. 146246074Sgabor */ 147246074Sgaborstatic void 148246074Sgaborgrow_hunkmax(void) 149246074Sgabor{ 150267464Spfg int new_hunkmax = hunkmax * 2; 151246074Sgabor 152246074Sgabor if (p_line == NULL || p_len == NULL || p_char == NULL) 153246074Sgabor fatal("Internal memory allocation error\n"); 154246074Sgabor 155267464Spfg p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); 156267490Spfg p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); 157267464Spfg p_char = reallocf(p_char, new_hunkmax * sizeof(char)); 158246074Sgabor 159246074Sgabor if (p_line != NULL && p_len != NULL && p_char != NULL) { 160246074Sgabor hunkmax = new_hunkmax; 161246074Sgabor return; 162246074Sgabor } 163246074Sgabor 164246074Sgabor if (!using_plan_a) 165246074Sgabor fatal("out of memory\n"); 166246074Sgabor out_of_mem = true; /* whatever is null will be allocated again */ 167246074Sgabor /* from within plan_a(), of all places */ 168246074Sgabor} 169246074Sgabor 170246074Sgabor/* True if the remainder of the patch file contains a diff of some sort. */ 171246074Sgabor 172246074Sgaborbool 173246074Sgaborthere_is_another_patch(void) 174246074Sgabor{ 175246074Sgabor bool exists = false; 176246074Sgabor 177275553Spfg if (p_base != 0 && p_base >= p_filesize) { 178246074Sgabor if (verbose) 179246074Sgabor say("done\n"); 180246074Sgabor return false; 181246074Sgabor } 182246074Sgabor if (verbose) 183246074Sgabor say("Hmm..."); 184246074Sgabor diff_type = intuit_diff_type(); 185246074Sgabor if (!diff_type) { 186275553Spfg if (p_base != 0) { 187246074Sgabor if (verbose) 188246074Sgabor say(" Ignoring the trailing garbage.\ndone\n"); 189246074Sgabor } else 190246074Sgabor say(" I can't seem to find a patch in there anywhere.\n"); 191246074Sgabor return false; 192246074Sgabor } 193246074Sgabor if (verbose) 194246074Sgabor say(" %sooks like %s to me...\n", 195275553Spfg (p_base == 0 ? "L" : "The next patch l"), 196246074Sgabor diff_type == UNI_DIFF ? "a unified diff" : 197246074Sgabor diff_type == CONTEXT_DIFF ? "a context diff" : 198246074Sgabor diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 199246074Sgabor diff_type == NORMAL_DIFF ? "a normal diff" : 200246074Sgabor "an ed script"); 201246074Sgabor if (p_indent && verbose) 202246074Sgabor say("(Patch is indented %d space%s.)\n", p_indent, 203246074Sgabor p_indent == 1 ? "" : "s"); 204246074Sgabor skip_to(p_start, p_sline); 205246074Sgabor while (filearg[0] == NULL) { 206246074Sgabor if (force || batch) { 207246074Sgabor say("No file to patch. Skipping...\n"); 208276218Spfg filearg[0] = xstrdup(bestguess); 209246074Sgabor skip_rest_of_patch = true; 210246074Sgabor return true; 211246074Sgabor } 212246074Sgabor ask("File to patch: "); 213246074Sgabor if (*buf != '\n') { 214246074Sgabor free(bestguess); 215276218Spfg bestguess = xstrdup(buf); 216246074Sgabor filearg[0] = fetchname(buf, &exists, 0); 217246074Sgabor } 218246074Sgabor if (!exists) { 219320084Spfg int def_skip = *bestguess == '\0'; 220320084Spfg ask("No file found--skip this patch? [%c] ", 221320084Spfg def_skip ? 'y' : 'n'); 222320084Spfg if (*buf == 'n' || (!def_skip && *buf != 'y')) 223246074Sgabor continue; 224246074Sgabor if (verbose) 225246074Sgabor say("Skipping patch...\n"); 226246074Sgabor free(filearg[0]); 227246074Sgabor filearg[0] = fetchname(bestguess, &exists, 0); 228246074Sgabor skip_rest_of_patch = true; 229246074Sgabor return true; 230246074Sgabor } 231246074Sgabor } 232246074Sgabor return true; 233246074Sgabor} 234246074Sgabor 235246074Sgaborstatic void 236246074Sgaborp4_fetchname(struct file_name *name, char *str) 237246074Sgabor{ 238246074Sgabor char *t, *h; 239246074Sgabor 240246074Sgabor /* Skip leading whitespace. */ 241246074Sgabor while (isspace((unsigned char)*str)) 242246074Sgabor str++; 243246074Sgabor 244246074Sgabor /* Remove the file revision number. */ 245246074Sgabor for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 246246074Sgabor if (*t == '#') 247246074Sgabor h = t; 248246074Sgabor if (h != NULL) 249246074Sgabor *h = '\0'; 250246074Sgabor 251246074Sgabor name->path = fetchname(str, &name->exists, strippath); 252246074Sgabor} 253246074Sgabor 254246074Sgabor/* Determine what kind of diff is in the remaining part of the patch file. */ 255246074Sgabor 256246074Sgaborstatic int 257246074Sgaborintuit_diff_type(void) 258246074Sgabor{ 259275553Spfg off_t this_line = 0, previous_line; 260275553Spfg off_t first_command_line = -1; 261246074Sgabor LINENUM fcl_line = -1; 262246074Sgabor bool last_line_was_command = false, this_is_a_command = false; 263246074Sgabor bool stars_last_line = false, stars_this_line = false; 264246074Sgabor char *s, *t; 265246074Sgabor int indent, retval; 266246074Sgabor struct file_name names[MAX_FILE]; 267246074Sgabor 268246074Sgabor memset(names, 0, sizeof(names)); 269246074Sgabor ok_to_create_file = false; 270275553Spfg fseeko(pfp, p_base, SEEK_SET); 271246074Sgabor p_input_line = p_bline - 1; 272246074Sgabor for (;;) { 273246074Sgabor previous_line = this_line; 274246074Sgabor last_line_was_command = this_is_a_command; 275246074Sgabor stars_last_line = stars_this_line; 276275553Spfg this_line = ftello(pfp); 277246074Sgabor indent = 0; 278246074Sgabor p_input_line++; 279246074Sgabor if (pgets(false) == 0) { 280275553Spfg if (first_command_line >= 0) { 281246074Sgabor /* nothing but deletes!? */ 282246074Sgabor p_start = first_command_line; 283246074Sgabor p_sline = fcl_line; 284246074Sgabor retval = ED_DIFF; 285246074Sgabor goto scan_exit; 286246074Sgabor } else { 287246074Sgabor p_start = this_line; 288246074Sgabor p_sline = p_input_line; 289246074Sgabor retval = 0; 290246074Sgabor goto scan_exit; 291246074Sgabor } 292246074Sgabor } 293246074Sgabor for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 294246074Sgabor if (*s == '\t') 295246074Sgabor indent += 8 - (indent % 8); 296246074Sgabor else 297246074Sgabor indent++; 298246074Sgabor } 299246074Sgabor for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 300246074Sgabor ; 301246074Sgabor this_is_a_command = (isdigit((unsigned char)*s) && 302246074Sgabor (*t == 'd' || *t == 'c' || *t == 'a')); 303275553Spfg if (first_command_line < 0 && this_is_a_command) { 304246074Sgabor first_command_line = this_line; 305246074Sgabor fcl_line = p_input_line; 306246074Sgabor p_indent = indent; /* assume this for now */ 307246074Sgabor } 308246074Sgabor if (!stars_last_line && strnEQ(s, "*** ", 4)) 309246074Sgabor names[OLD_FILE].path = fetchname(s + 4, 310246074Sgabor &names[OLD_FILE].exists, strippath); 311246074Sgabor else if (strnEQ(s, "--- ", 4)) 312246074Sgabor names[NEW_FILE].path = fetchname(s + 4, 313246074Sgabor &names[NEW_FILE].exists, strippath); 314246074Sgabor else if (strnEQ(s, "+++ ", 4)) 315246074Sgabor /* pretend it is the old name */ 316246074Sgabor names[OLD_FILE].path = fetchname(s + 4, 317246074Sgabor &names[OLD_FILE].exists, strippath); 318246074Sgabor else if (strnEQ(s, "Index:", 6)) 319246074Sgabor names[INDEX_FILE].path = fetchname(s + 6, 320246074Sgabor &names[INDEX_FILE].exists, strippath); 321246074Sgabor else if (strnEQ(s, "Prereq:", 7)) { 322246074Sgabor for (t = s + 7; isspace((unsigned char)*t); t++) 323246074Sgabor ; 324276218Spfg revision = xstrdup(t); 325275582Spfg for (t = revision; 326275582Spfg *t && !isspace((unsigned char)*t); t++) 327246074Sgabor ; 328246074Sgabor *t = '\0'; 329246074Sgabor if (*revision == '\0') { 330246074Sgabor free(revision); 331246074Sgabor revision = NULL; 332246074Sgabor } 333246074Sgabor } else if (strnEQ(s, "==== ", 5)) { 334246074Sgabor /* Perforce-style diffs. */ 335246074Sgabor if ((t = strstr(s + 5, " - ")) != NULL) 336246074Sgabor p4_fetchname(&names[NEW_FILE], t + 3); 337246074Sgabor p4_fetchname(&names[OLD_FILE], s + 5); 338246074Sgabor } 339246074Sgabor if ((!diff_type || diff_type == ED_DIFF) && 340275553Spfg first_command_line >= 0 && 341246074Sgabor strEQ(s, ".\n")) { 342246074Sgabor p_indent = indent; 343246074Sgabor p_start = first_command_line; 344246074Sgabor p_sline = fcl_line; 345246074Sgabor retval = ED_DIFF; 346246074Sgabor goto scan_exit; 347246074Sgabor } 348246074Sgabor if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 349246074Sgabor if (strnEQ(s + 4, "0,0", 3)) 350246074Sgabor ok_to_create_file = true; 351246074Sgabor p_indent = indent; 352246074Sgabor p_start = this_line; 353246074Sgabor p_sline = p_input_line; 354246074Sgabor retval = UNI_DIFF; 355246074Sgabor goto scan_exit; 356246074Sgabor } 357246074Sgabor stars_this_line = strnEQ(s, "********", 8); 358246074Sgabor if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 359246074Sgabor strnEQ(s, "*** ", 4)) { 360275612Spfg if (strtolinenum(s + 4, &s) == 0) 361246074Sgabor ok_to_create_file = true; 362246074Sgabor /* 363246074Sgabor * If this is a new context diff the character just 364275553Spfg * at the end of the line is a '*'. 365246074Sgabor */ 366275553Spfg while (*s && *s != '\n') 367246074Sgabor s++; 368246074Sgabor p_indent = indent; 369246074Sgabor p_start = previous_line; 370246074Sgabor p_sline = p_input_line - 1; 371246074Sgabor retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 372246074Sgabor goto scan_exit; 373246074Sgabor } 374246074Sgabor if ((!diff_type || diff_type == NORMAL_DIFF) && 375246074Sgabor last_line_was_command && 376246074Sgabor (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 377246074Sgabor p_start = previous_line; 378246074Sgabor p_sline = p_input_line - 1; 379246074Sgabor p_indent = indent; 380246074Sgabor retval = NORMAL_DIFF; 381246074Sgabor goto scan_exit; 382246074Sgabor } 383246074Sgabor } 384246074Sgaborscan_exit: 385246074Sgabor if (retval == UNI_DIFF) { 386246074Sgabor /* unswap old and new */ 387246074Sgabor struct file_name tmp = names[OLD_FILE]; 388246074Sgabor names[OLD_FILE] = names[NEW_FILE]; 389246074Sgabor names[NEW_FILE] = tmp; 390246074Sgabor } 391246074Sgabor if (filearg[0] == NULL) { 392246074Sgabor if (posix) 393246074Sgabor filearg[0] = posix_name(names, ok_to_create_file); 394246074Sgabor else { 395246074Sgabor /* Ignore the Index: name for context diffs, like GNU */ 396246074Sgabor if (names[OLD_FILE].path != NULL || 397246074Sgabor names[NEW_FILE].path != NULL) { 398246074Sgabor free(names[INDEX_FILE].path); 399246074Sgabor names[INDEX_FILE].path = NULL; 400246074Sgabor } 401246074Sgabor filearg[0] = best_name(names, ok_to_create_file); 402246074Sgabor } 403246074Sgabor } 404246074Sgabor 405246074Sgabor free(bestguess); 406246074Sgabor bestguess = NULL; 407246074Sgabor if (filearg[0] != NULL) 408276218Spfg bestguess = xstrdup(filearg[0]); 409246074Sgabor else if (!ok_to_create_file) { 410246074Sgabor /* 411246074Sgabor * We don't want to create a new file but we need a 412246074Sgabor * filename to set bestguess. Avoid setting filearg[0] 413246074Sgabor * so the file is not created automatically. 414246074Sgabor */ 415246074Sgabor if (posix) 416246074Sgabor bestguess = posix_name(names, true); 417246074Sgabor else 418246074Sgabor bestguess = best_name(names, true); 419246074Sgabor } 420246074Sgabor free(names[OLD_FILE].path); 421246074Sgabor free(names[NEW_FILE].path); 422246074Sgabor free(names[INDEX_FILE].path); 423246074Sgabor return retval; 424246074Sgabor} 425246074Sgabor 426246074Sgabor/* 427246074Sgabor * Remember where this patch ends so we know where to start up again. 428246074Sgabor */ 429246074Sgaborstatic void 430275553Spfgnext_intuit_at(off_t file_pos, LINENUM file_line) 431246074Sgabor{ 432246074Sgabor p_base = file_pos; 433246074Sgabor p_bline = file_line; 434246074Sgabor} 435246074Sgabor 436246074Sgabor/* 437275553Spfg * Basically a verbose fseeko() to the actual diff listing. 438246074Sgabor */ 439246074Sgaborstatic void 440275553Spfgskip_to(off_t file_pos, LINENUM file_line) 441246074Sgabor{ 442246074Sgabor size_t len; 443246074Sgabor 444246074Sgabor if (p_base > file_pos) 445275553Spfg fatal("Internal error: seek %lld>%lld\n", 446275553Spfg (long long)p_base, (long long)file_pos); 447246074Sgabor if (verbose && p_base < file_pos) { 448275553Spfg fseeko(pfp, p_base, SEEK_SET); 449246074Sgabor say("The text leading up to this was:\n--------------------------\n"); 450275553Spfg while (ftello(pfp) < file_pos) { 451246074Sgabor len = pgets(false); 452246074Sgabor if (len == 0) 453246074Sgabor fatal("Unexpected end of file\n"); 454246074Sgabor say("|%s", buf); 455246074Sgabor } 456246074Sgabor say("--------------------------\n"); 457246074Sgabor } else 458275553Spfg fseeko(pfp, file_pos, SEEK_SET); 459246074Sgabor p_input_line = file_line - 1; 460246074Sgabor} 461246074Sgabor 462246074Sgabor/* Make this a function for better debugging. */ 463246074Sgaborstatic void 464246074Sgabormalformed(void) 465246074Sgabor{ 466246074Sgabor fatal("malformed patch at line %ld: %s", p_input_line, buf); 467246074Sgabor /* about as informative as "Syntax error" in C */ 468246074Sgabor} 469246074Sgabor 470246074Sgabor/* 471246074Sgabor * True if the line has been discarded (i.e. it is a line saying 472246074Sgabor * "\ No newline at end of file".) 473246074Sgabor */ 474246074Sgaborstatic bool 475246074Sgaborremove_special_line(void) 476246074Sgabor{ 477246074Sgabor int c; 478246074Sgabor 479246074Sgabor c = fgetc(pfp); 480246074Sgabor if (c == '\\') { 481246074Sgabor do { 482246074Sgabor c = fgetc(pfp); 483246074Sgabor } while (c != EOF && c != '\n'); 484246074Sgabor 485246074Sgabor return true; 486246074Sgabor } 487246074Sgabor if (c != EOF) 488275553Spfg fseeko(pfp, -1, SEEK_CUR); 489246074Sgabor 490246074Sgabor return false; 491246074Sgabor} 492246074Sgabor 493246074Sgabor/* 494246074Sgabor * True if there is more of the current diff listing to process. 495246074Sgabor */ 496246074Sgaborbool 497246074Sgaboranother_hunk(void) 498246074Sgabor{ 499275553Spfg off_t line_beginning; /* file pos of the current line */ 500246074Sgabor LINENUM repl_beginning; /* index of --- line */ 501246074Sgabor LINENUM fillcnt; /* #lines of missing ptrn or repl */ 502246074Sgabor LINENUM fillsrc; /* index of first line to copy */ 503246074Sgabor LINENUM filldst; /* index of first missing line */ 504289677Seadler bool ptrn_spaces_eaten; /* ptrn was slightly malformed */ 505246074Sgabor bool repl_could_be_missing; /* no + or ! lines in this hunk */ 506246074Sgabor bool repl_missing; /* we are now backtracking */ 507275553Spfg off_t repl_backtrack_position; /* file pos of first repl line */ 508246074Sgabor LINENUM repl_patch_line; /* input line number for same */ 509246074Sgabor LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 510246074Sgabor char *s; 511246074Sgabor size_t len; 512246074Sgabor int context = 0; 513246074Sgabor 514246074Sgabor while (p_end >= 0) { 515246074Sgabor if (p_end == p_efake) 516246074Sgabor p_end = p_bfake; /* don't free twice */ 517246074Sgabor else 518246074Sgabor free(p_line[p_end]); 519246074Sgabor p_end--; 520246074Sgabor } 521246074Sgabor p_efake = -1; 522246074Sgabor 523246074Sgabor p_max = hunkmax; /* gets reduced when --- found */ 524246074Sgabor if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 525275553Spfg line_beginning = ftello(pfp); 526246074Sgabor repl_beginning = 0; 527246074Sgabor fillcnt = 0; 528246074Sgabor fillsrc = 0; 529246074Sgabor filldst = 0; 530246074Sgabor ptrn_spaces_eaten = false; 531246074Sgabor repl_could_be_missing = true; 532246074Sgabor repl_missing = false; 533246074Sgabor repl_backtrack_position = 0; 534246074Sgabor repl_patch_line = 0; 535246074Sgabor ptrn_copiable = 0; 536246074Sgabor 537246074Sgabor len = pgets(true); 538246074Sgabor p_input_line++; 539246074Sgabor if (len == 0 || strnNE(buf, "********", 8)) { 540246074Sgabor next_intuit_at(line_beginning, p_input_line); 541246074Sgabor return false; 542246074Sgabor } 543246074Sgabor p_context = 100; 544246074Sgabor p_hunk_beg = p_input_line + 1; 545246074Sgabor while (p_end < p_max) { 546275553Spfg line_beginning = ftello(pfp); 547246074Sgabor len = pgets(true); 548246074Sgabor p_input_line++; 549246074Sgabor if (len == 0) { 550246074Sgabor if (p_max - p_end < 4) { 551246074Sgabor /* assume blank lines got chopped */ 552246074Sgabor strlcpy(buf, " \n", buf_size); 553246074Sgabor } else { 554246074Sgabor if (repl_beginning && repl_could_be_missing) { 555246074Sgabor repl_missing = true; 556246074Sgabor goto hunk_done; 557246074Sgabor } 558246074Sgabor fatal("unexpected end of file in patch\n"); 559246074Sgabor } 560246074Sgabor } 561246074Sgabor p_end++; 562246074Sgabor if (p_end >= hunkmax) 563246074Sgabor fatal("Internal error: hunk larger than hunk " 564246074Sgabor "buffer size"); 565246074Sgabor p_char[p_end] = *buf; 566246074Sgabor p_line[p_end] = NULL; 567246074Sgabor switch (*buf) { 568246074Sgabor case '*': 569246074Sgabor if (strnEQ(buf, "********", 8)) { 570246074Sgabor if (repl_beginning && repl_could_be_missing) { 571246074Sgabor repl_missing = true; 572246074Sgabor goto hunk_done; 573246074Sgabor } else 574246074Sgabor fatal("unexpected end of hunk " 575246074Sgabor "at line %ld\n", 576246074Sgabor p_input_line); 577246074Sgabor } 578246074Sgabor if (p_end != 0) { 579246074Sgabor if (repl_beginning && repl_could_be_missing) { 580246074Sgabor repl_missing = true; 581246074Sgabor goto hunk_done; 582246074Sgabor } 583246074Sgabor fatal("unexpected *** at line %ld: %s", 584246074Sgabor p_input_line, buf); 585246074Sgabor } 586246074Sgabor context = 0; 587246074Sgabor p_line[p_end] = savestr(buf); 588246074Sgabor if (out_of_mem) { 589246074Sgabor p_end--; 590246074Sgabor return false; 591246074Sgabor } 592275582Spfg for (s = buf; 593275582Spfg *s && !isdigit((unsigned char)*s); s++) 594246074Sgabor ; 595246074Sgabor if (!*s) 596246074Sgabor malformed(); 597246074Sgabor if (strnEQ(s, "0,0", 3)) 598246074Sgabor memmove(s, s + 2, strlen(s + 2) + 1); 599275612Spfg p_first = strtolinenum(s, &s); 600246074Sgabor if (*s == ',') { 601275582Spfg for (; 602275582Spfg *s && !isdigit((unsigned char)*s); s++) 603246074Sgabor ; 604246074Sgabor if (!*s) 605246074Sgabor malformed(); 606275612Spfg p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 607275612Spfg if (p_ptrn_lines < 0) 608275612Spfg malformed(); 609246074Sgabor } else if (p_first) 610246074Sgabor p_ptrn_lines = 1; 611246074Sgabor else { 612246074Sgabor p_ptrn_lines = 0; 613246074Sgabor p_first = 1; 614246074Sgabor } 615275612Spfg if (p_first >= LINENUM_MAX - p_ptrn_lines || 616275612Spfg p_ptrn_lines >= LINENUM_MAX - 6) 617275612Spfg malformed(); 618246074Sgabor 619246074Sgabor /* we need this much at least */ 620246074Sgabor p_max = p_ptrn_lines + 6; 621246074Sgabor while (p_max >= hunkmax) 622246074Sgabor grow_hunkmax(); 623246074Sgabor p_max = hunkmax; 624246074Sgabor break; 625246074Sgabor case '-': 626246074Sgabor if (buf[1] == '-') { 627246074Sgabor if (repl_beginning || 628246074Sgabor (p_end != p_ptrn_lines + 1 + 629246074Sgabor (p_char[p_end - 1] == '\n'))) { 630246074Sgabor if (p_end == 1) { 631246074Sgabor /* 632246074Sgabor * `old' lines were omitted; 633246074Sgabor * set up to fill them in 634246074Sgabor * from 'new' context lines. 635246074Sgabor */ 636246074Sgabor p_end = p_ptrn_lines + 1; 637246074Sgabor fillsrc = p_end + 1; 638246074Sgabor filldst = 1; 639246074Sgabor fillcnt = p_ptrn_lines; 640246074Sgabor } else { 641246074Sgabor if (repl_beginning) { 642246074Sgabor if (repl_could_be_missing) { 643246074Sgabor repl_missing = true; 644246074Sgabor goto hunk_done; 645246074Sgabor } 646246074Sgabor fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 647246074Sgabor p_input_line, p_hunk_beg + repl_beginning); 648246074Sgabor } else { 649246074Sgabor fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 650246074Sgabor (p_end <= p_ptrn_lines 651246074Sgabor ? "Premature" 652246074Sgabor : "Overdue"), 653246074Sgabor p_input_line, p_hunk_beg); 654246074Sgabor } 655246074Sgabor } 656246074Sgabor } 657246074Sgabor repl_beginning = p_end; 658275553Spfg repl_backtrack_position = ftello(pfp); 659246074Sgabor repl_patch_line = p_input_line; 660246074Sgabor p_line[p_end] = savestr(buf); 661246074Sgabor if (out_of_mem) { 662246074Sgabor p_end--; 663246074Sgabor return false; 664246074Sgabor } 665246074Sgabor p_char[p_end] = '='; 666246074Sgabor for (s = buf; *s && !isdigit((unsigned char)*s); s++) 667246074Sgabor ; 668246074Sgabor if (!*s) 669246074Sgabor malformed(); 670275612Spfg p_newfirst = strtolinenum(s, &s); 671246074Sgabor if (*s == ',') { 672246074Sgabor for (; *s && !isdigit((unsigned char)*s); s++) 673246074Sgabor ; 674246074Sgabor if (!*s) 675246074Sgabor malformed(); 676275612Spfg p_repl_lines = strtolinenum(s, &s) - 677246074Sgabor p_newfirst + 1; 678275612Spfg if (p_repl_lines < 0) 679275612Spfg malformed(); 680246074Sgabor } else if (p_newfirst) 681246074Sgabor p_repl_lines = 1; 682246074Sgabor else { 683246074Sgabor p_repl_lines = 0; 684246074Sgabor p_newfirst = 1; 685246074Sgabor } 686275612Spfg if (p_newfirst >= LINENUM_MAX - p_repl_lines || 687275612Spfg p_repl_lines >= LINENUM_MAX - p_end) 688275612Spfg malformed(); 689246074Sgabor p_max = p_repl_lines + p_end; 690246074Sgabor if (p_max > MAXHUNKSIZE) 691246074Sgabor fatal("hunk too large (%ld lines) at line %ld: %s", 692246074Sgabor p_max, p_input_line, buf); 693246074Sgabor while (p_max >= hunkmax) 694246074Sgabor grow_hunkmax(); 695246074Sgabor if (p_repl_lines != ptrn_copiable && 696246074Sgabor (p_context != 0 || p_repl_lines != 1)) 697246074Sgabor repl_could_be_missing = false; 698246074Sgabor break; 699246074Sgabor } 700246074Sgabor goto change_line; 701246074Sgabor case '+': 702246074Sgabor case '!': 703246074Sgabor repl_could_be_missing = false; 704246074Sgabor change_line: 705246074Sgabor if (buf[1] == '\n' && canonicalize) 706246074Sgabor strlcpy(buf + 1, " \n", buf_size - 1); 707275582Spfg if (!isspace((unsigned char)buf[1]) && 708275582Spfg buf[1] != '>' && buf[1] != '<' && 709246074Sgabor repl_beginning && repl_could_be_missing) { 710246074Sgabor repl_missing = true; 711246074Sgabor goto hunk_done; 712246074Sgabor } 713246074Sgabor if (context >= 0) { 714246074Sgabor if (context < p_context) 715246074Sgabor p_context = context; 716246074Sgabor context = -1000; 717246074Sgabor } 718246074Sgabor p_line[p_end] = savestr(buf + 2); 719246074Sgabor if (out_of_mem) { 720246074Sgabor p_end--; 721246074Sgabor return false; 722246074Sgabor } 723246074Sgabor if (p_end == p_ptrn_lines) { 724246074Sgabor if (remove_special_line()) { 725246074Sgabor int l; 726246074Sgabor 727246074Sgabor l = strlen(p_line[p_end]) - 1; 728246074Sgabor (p_line[p_end])[l] = 0; 729246074Sgabor } 730246074Sgabor } 731246074Sgabor break; 732246074Sgabor case '\t': 733246074Sgabor case '\n': /* assume the 2 spaces got eaten */ 734246074Sgabor if (repl_beginning && repl_could_be_missing && 735246074Sgabor (!ptrn_spaces_eaten || 736246074Sgabor diff_type == NEW_CONTEXT_DIFF)) { 737246074Sgabor repl_missing = true; 738246074Sgabor goto hunk_done; 739246074Sgabor } 740246074Sgabor p_line[p_end] = savestr(buf); 741246074Sgabor if (out_of_mem) { 742246074Sgabor p_end--; 743246074Sgabor return false; 744246074Sgabor } 745246074Sgabor if (p_end != p_ptrn_lines + 1) { 746246074Sgabor ptrn_spaces_eaten |= (repl_beginning != 0); 747246074Sgabor context++; 748246074Sgabor if (!repl_beginning) 749246074Sgabor ptrn_copiable++; 750246074Sgabor p_char[p_end] = ' '; 751246074Sgabor } 752246074Sgabor break; 753246074Sgabor case ' ': 754246074Sgabor if (!isspace((unsigned char)buf[1]) && 755246074Sgabor repl_beginning && repl_could_be_missing) { 756246074Sgabor repl_missing = true; 757246074Sgabor goto hunk_done; 758246074Sgabor } 759246074Sgabor context++; 760246074Sgabor if (!repl_beginning) 761246074Sgabor ptrn_copiable++; 762246074Sgabor p_line[p_end] = savestr(buf + 2); 763246074Sgabor if (out_of_mem) { 764246074Sgabor p_end--; 765246074Sgabor return false; 766246074Sgabor } 767246074Sgabor break; 768246074Sgabor default: 769246074Sgabor if (repl_beginning && repl_could_be_missing) { 770246074Sgabor repl_missing = true; 771246074Sgabor goto hunk_done; 772246074Sgabor } 773246074Sgabor malformed(); 774246074Sgabor } 775246074Sgabor /* set up p_len for strncmp() so we don't have to */ 776246074Sgabor /* assume null termination */ 777246074Sgabor if (p_line[p_end]) 778246074Sgabor p_len[p_end] = strlen(p_line[p_end]); 779246074Sgabor else 780246074Sgabor p_len[p_end] = 0; 781246074Sgabor } 782246074Sgabor 783246074Sgaborhunk_done: 784246074Sgabor if (p_end >= 0 && !repl_beginning) 785246074Sgabor fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 786246074Sgabor 787246074Sgabor if (repl_missing) { 788246074Sgabor 789246074Sgabor /* reset state back to just after --- */ 790246074Sgabor p_input_line = repl_patch_line; 791246074Sgabor for (p_end--; p_end > repl_beginning; p_end--) 792246074Sgabor free(p_line[p_end]); 793275553Spfg fseeko(pfp, repl_backtrack_position, SEEK_SET); 794246074Sgabor 795246074Sgabor /* redundant 'new' context lines were omitted - set */ 796246074Sgabor /* up to fill them in from the old file context */ 797246074Sgabor if (!p_context && p_repl_lines == 1) { 798246074Sgabor p_repl_lines = 0; 799246074Sgabor p_max--; 800246074Sgabor } 801246074Sgabor fillsrc = 1; 802246074Sgabor filldst = repl_beginning + 1; 803246074Sgabor fillcnt = p_repl_lines; 804246074Sgabor p_end = p_max; 805246074Sgabor } else if (!p_context && fillcnt == 1) { 806246074Sgabor /* the first hunk was a null hunk with no context */ 807246074Sgabor /* and we were expecting one line -- fix it up. */ 808246074Sgabor while (filldst < p_end) { 809246074Sgabor p_line[filldst] = p_line[filldst + 1]; 810246074Sgabor p_char[filldst] = p_char[filldst + 1]; 811246074Sgabor p_len[filldst] = p_len[filldst + 1]; 812246074Sgabor filldst++; 813246074Sgabor } 814246074Sgabor#if 0 815246074Sgabor repl_beginning--; /* this doesn't need to be fixed */ 816246074Sgabor#endif 817246074Sgabor p_end--; 818246074Sgabor p_first++; /* do append rather than insert */ 819246074Sgabor fillcnt = 0; 820246074Sgabor p_ptrn_lines = 0; 821246074Sgabor } 822246074Sgabor if (diff_type == CONTEXT_DIFF && 823246074Sgabor (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 824246074Sgabor if (verbose) 825246074Sgabor say("%s\n%s\n%s\n", 826246074Sgabor "(Fascinating--this is really a new-style context diff but without", 827246074Sgabor "the telltale extra asterisks on the *** line that usually indicate", 828246074Sgabor "the new style...)"); 829246074Sgabor diff_type = NEW_CONTEXT_DIFF; 830246074Sgabor } 831246074Sgabor /* if there were omitted context lines, fill them in now */ 832246074Sgabor if (fillcnt) { 833246074Sgabor p_bfake = filldst; /* remember where not to free() */ 834246074Sgabor p_efake = filldst + fillcnt - 1; 835246074Sgabor while (fillcnt-- > 0) { 836246074Sgabor while (fillsrc <= p_end && p_char[fillsrc] != ' ') 837246074Sgabor fillsrc++; 838246074Sgabor if (fillsrc > p_end) 839246074Sgabor fatal("replacement text or line numbers mangled in hunk at line %ld\n", 840246074Sgabor p_hunk_beg); 841246074Sgabor p_line[filldst] = p_line[fillsrc]; 842246074Sgabor p_char[filldst] = p_char[fillsrc]; 843246074Sgabor p_len[filldst] = p_len[fillsrc]; 844246074Sgabor fillsrc++; 845246074Sgabor filldst++; 846246074Sgabor } 847246074Sgabor while (fillsrc <= p_end && fillsrc != repl_beginning && 848246074Sgabor p_char[fillsrc] != ' ') 849246074Sgabor fillsrc++; 850246074Sgabor#ifdef DEBUGGING 851246074Sgabor if (debug & 64) 852246074Sgabor printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 853246074Sgabor fillsrc, filldst, repl_beginning, p_end + 1); 854246074Sgabor#endif 855246074Sgabor if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 856246074Sgabor malformed(); 857246074Sgabor if (filldst != p_end + 1 && filldst != repl_beginning) 858246074Sgabor malformed(); 859246074Sgabor } 860246074Sgabor if (p_line[p_end] != NULL) { 861246074Sgabor if (remove_special_line()) { 862246074Sgabor p_len[p_end] -= 1; 863246074Sgabor (p_line[p_end])[p_len[p_end]] = 0; 864246074Sgabor } 865246074Sgabor } 866246074Sgabor } else if (diff_type == UNI_DIFF) { 867246074Sgabor LINENUM fillold; /* index of old lines */ 868246074Sgabor LINENUM fillnew; /* index of new lines */ 869246074Sgabor char ch; 870246074Sgabor 871275553Spfg line_beginning = ftello(pfp); /* file pos of the current line */ 872246074Sgabor len = pgets(true); 873246074Sgabor p_input_line++; 874246074Sgabor if (len == 0 || strnNE(buf, "@@ -", 4)) { 875246074Sgabor next_intuit_at(line_beginning, p_input_line); 876246074Sgabor return false; 877246074Sgabor } 878246074Sgabor s = buf + 4; 879246074Sgabor if (!*s) 880246074Sgabor malformed(); 881275612Spfg p_first = strtolinenum(s, &s); 882246074Sgabor if (*s == ',') { 883275612Spfg p_ptrn_lines = strtolinenum(s + 1, &s); 884246074Sgabor } else 885246074Sgabor p_ptrn_lines = 1; 886246074Sgabor if (*s == ' ') 887246074Sgabor s++; 888246074Sgabor if (*s != '+' || !*++s) 889246074Sgabor malformed(); 890275612Spfg p_newfirst = strtolinenum(s, &s); 891246074Sgabor if (*s == ',') { 892275612Spfg p_repl_lines = strtolinenum(s + 1, &s); 893246074Sgabor } else 894246074Sgabor p_repl_lines = 1; 895246074Sgabor if (*s == ' ') 896246074Sgabor s++; 897246074Sgabor if (*s != '@') 898246074Sgabor malformed(); 899275612Spfg if (p_first >= LINENUM_MAX - p_ptrn_lines || 900275612Spfg p_newfirst > LINENUM_MAX - p_repl_lines || 901275612Spfg p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 902275612Spfg malformed(); 903246074Sgabor if (!p_ptrn_lines) 904246074Sgabor p_first++; /* do append rather than insert */ 905246074Sgabor p_max = p_ptrn_lines + p_repl_lines + 1; 906246074Sgabor while (p_max >= hunkmax) 907246074Sgabor grow_hunkmax(); 908246074Sgabor fillold = 1; 909246074Sgabor fillnew = fillold + p_ptrn_lines; 910246074Sgabor p_end = fillnew + p_repl_lines; 911246074Sgabor snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 912246074Sgabor p_first + p_ptrn_lines - 1); 913246074Sgabor p_line[0] = savestr(buf); 914246074Sgabor if (out_of_mem) { 915246074Sgabor p_end = -1; 916246074Sgabor return false; 917246074Sgabor } 918246074Sgabor p_char[0] = '*'; 919246074Sgabor snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 920246074Sgabor p_newfirst + p_repl_lines - 1); 921246074Sgabor p_line[fillnew] = savestr(buf); 922246074Sgabor if (out_of_mem) { 923246074Sgabor p_end = 0; 924246074Sgabor return false; 925246074Sgabor } 926246074Sgabor p_char[fillnew++] = '='; 927246074Sgabor p_context = 100; 928246074Sgabor context = 0; 929246074Sgabor p_hunk_beg = p_input_line + 1; 930246074Sgabor while (fillold <= p_ptrn_lines || fillnew <= p_end) { 931275553Spfg line_beginning = ftello(pfp); 932246074Sgabor len = pgets(true); 933246074Sgabor p_input_line++; 934246074Sgabor if (len == 0) { 935246074Sgabor if (p_max - fillnew < 3) { 936246074Sgabor /* assume blank lines got chopped */ 937246074Sgabor strlcpy(buf, " \n", buf_size); 938246074Sgabor } else { 939246074Sgabor fatal("unexpected end of file in patch\n"); 940246074Sgabor } 941246074Sgabor } 942246074Sgabor if (*buf == '\t' || *buf == '\n') { 943246074Sgabor ch = ' '; /* assume the space got eaten */ 944246074Sgabor s = savestr(buf); 945246074Sgabor } else { 946246074Sgabor ch = *buf; 947246074Sgabor s = savestr(buf + 1); 948246074Sgabor } 949246074Sgabor if (out_of_mem) { 950246074Sgabor while (--fillnew > p_ptrn_lines) 951246074Sgabor free(p_line[fillnew]); 952246074Sgabor p_end = fillold - 1; 953246074Sgabor return false; 954246074Sgabor } 955246074Sgabor switch (ch) { 956246074Sgabor case '-': 957246074Sgabor if (fillold > p_ptrn_lines) { 958246074Sgabor free(s); 959246074Sgabor p_end = fillnew - 1; 960246074Sgabor malformed(); 961246074Sgabor } 962246074Sgabor p_char[fillold] = ch; 963246074Sgabor p_line[fillold] = s; 964246074Sgabor p_len[fillold++] = strlen(s); 965246074Sgabor if (fillold > p_ptrn_lines) { 966246074Sgabor if (remove_special_line()) { 967246074Sgabor p_len[fillold - 1] -= 1; 968246074Sgabor s[p_len[fillold - 1]] = 0; 969246074Sgabor } 970246074Sgabor } 971246074Sgabor break; 972246074Sgabor case '=': 973246074Sgabor ch = ' '; 974246074Sgabor /* FALL THROUGH */ 975246074Sgabor case ' ': 976246074Sgabor if (fillold > p_ptrn_lines) { 977246074Sgabor free(s); 978246074Sgabor while (--fillnew > p_ptrn_lines) 979246074Sgabor free(p_line[fillnew]); 980246074Sgabor p_end = fillold - 1; 981246074Sgabor malformed(); 982246074Sgabor } 983246074Sgabor context++; 984246074Sgabor p_char[fillold] = ch; 985246074Sgabor p_line[fillold] = s; 986246074Sgabor p_len[fillold++] = strlen(s); 987246074Sgabor s = savestr(s); 988246074Sgabor if (out_of_mem) { 989246074Sgabor while (--fillnew > p_ptrn_lines) 990246074Sgabor free(p_line[fillnew]); 991246074Sgabor p_end = fillold - 1; 992246074Sgabor return false; 993246074Sgabor } 994246074Sgabor if (fillold > p_ptrn_lines) { 995246074Sgabor if (remove_special_line()) { 996246074Sgabor p_len[fillold - 1] -= 1; 997246074Sgabor s[p_len[fillold - 1]] = 0; 998246074Sgabor } 999246074Sgabor } 1000246074Sgabor /* FALL THROUGH */ 1001246074Sgabor case '+': 1002246074Sgabor if (fillnew > p_end) { 1003246074Sgabor free(s); 1004246074Sgabor while (--fillnew > p_ptrn_lines) 1005246074Sgabor free(p_line[fillnew]); 1006246074Sgabor p_end = fillold - 1; 1007246074Sgabor malformed(); 1008246074Sgabor } 1009246074Sgabor p_char[fillnew] = ch; 1010246074Sgabor p_line[fillnew] = s; 1011246074Sgabor p_len[fillnew++] = strlen(s); 1012246074Sgabor if (fillold > p_ptrn_lines) { 1013246074Sgabor if (remove_special_line()) { 1014246074Sgabor p_len[fillnew - 1] -= 1; 1015246074Sgabor s[p_len[fillnew - 1]] = 0; 1016246074Sgabor } 1017246074Sgabor } 1018246074Sgabor break; 1019246074Sgabor default: 1020246074Sgabor p_end = fillnew; 1021246074Sgabor malformed(); 1022246074Sgabor } 1023246074Sgabor if (ch != ' ' && context > 0) { 1024246074Sgabor if (context < p_context) 1025246074Sgabor p_context = context; 1026246074Sgabor context = -1000; 1027246074Sgabor } 1028246074Sgabor } /* while */ 1029246074Sgabor } else { /* normal diff--fake it up */ 1030246074Sgabor char hunk_type; 1031246074Sgabor int i; 1032246074Sgabor LINENUM min, max; 1033246074Sgabor 1034275553Spfg line_beginning = ftello(pfp); 1035246074Sgabor p_context = 0; 1036246074Sgabor len = pgets(true); 1037246074Sgabor p_input_line++; 1038246074Sgabor if (len == 0 || !isdigit((unsigned char)*buf)) { 1039246074Sgabor next_intuit_at(line_beginning, p_input_line); 1040246074Sgabor return false; 1041246074Sgabor } 1042275612Spfg p_first = strtolinenum(buf, &s); 1043246074Sgabor if (*s == ',') { 1044275612Spfg p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1045275612Spfg if (p_ptrn_lines < 0) 1046275612Spfg malformed(); 1047246074Sgabor } else 1048246074Sgabor p_ptrn_lines = (*s != 'a'); 1049246074Sgabor hunk_type = *s; 1050246074Sgabor if (hunk_type == 'a') 1051246074Sgabor p_first++; /* do append rather than insert */ 1052275612Spfg min = strtolinenum(s + 1, &s); 1053246074Sgabor if (*s == ',') 1054275612Spfg max = strtolinenum(s + 1, &s); 1055246074Sgabor else 1056246074Sgabor max = min; 1057275612Spfg if (min < 0 || min > max || max - min == LINENUM_MAX) 1058275612Spfg malformed(); 1059246074Sgabor if (hunk_type == 'd') 1060246074Sgabor min++; 1061275612Spfg p_newfirst = min; 1062275612Spfg p_repl_lines = max - min + 1; 1063275612Spfg if (p_newfirst > LINENUM_MAX - p_repl_lines || 1064275612Spfg p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1065275612Spfg malformed(); 1066275612Spfg p_end = p_ptrn_lines + p_repl_lines + 1; 1067246074Sgabor if (p_end > MAXHUNKSIZE) 1068246074Sgabor fatal("hunk too large (%ld lines) at line %ld: %s", 1069246074Sgabor p_end, p_input_line, buf); 1070246074Sgabor while (p_end >= hunkmax) 1071246074Sgabor grow_hunkmax(); 1072246074Sgabor snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1073246074Sgabor p_first + p_ptrn_lines - 1); 1074246074Sgabor p_line[0] = savestr(buf); 1075246074Sgabor if (out_of_mem) { 1076246074Sgabor p_end = -1; 1077246074Sgabor return false; 1078246074Sgabor } 1079246074Sgabor p_char[0] = '*'; 1080246074Sgabor for (i = 1; i <= p_ptrn_lines; i++) { 1081246074Sgabor len = pgets(true); 1082246074Sgabor p_input_line++; 1083246074Sgabor if (len == 0) 1084246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1085246074Sgabor p_input_line); 1086246074Sgabor if (*buf != '<') 1087246074Sgabor fatal("< expected at line %ld of patch\n", 1088246074Sgabor p_input_line); 1089246074Sgabor p_line[i] = savestr(buf + 2); 1090246074Sgabor if (out_of_mem) { 1091246074Sgabor p_end = i - 1; 1092246074Sgabor return false; 1093246074Sgabor } 1094246074Sgabor p_len[i] = strlen(p_line[i]); 1095246074Sgabor p_char[i] = '-'; 1096246074Sgabor } 1097246074Sgabor 1098246074Sgabor if (remove_special_line()) { 1099246074Sgabor p_len[i - 1] -= 1; 1100246074Sgabor (p_line[i - 1])[p_len[i - 1]] = 0; 1101246074Sgabor } 1102246074Sgabor if (hunk_type == 'c') { 1103246074Sgabor len = pgets(true); 1104246074Sgabor p_input_line++; 1105246074Sgabor if (len == 0) 1106246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1107246074Sgabor p_input_line); 1108246074Sgabor if (*buf != '-') 1109246074Sgabor fatal("--- expected at line %ld of patch\n", 1110246074Sgabor p_input_line); 1111246074Sgabor } 1112246074Sgabor snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1113246074Sgabor p_line[i] = savestr(buf); 1114246074Sgabor if (out_of_mem) { 1115246074Sgabor p_end = i - 1; 1116246074Sgabor return false; 1117246074Sgabor } 1118246074Sgabor p_char[i] = '='; 1119246074Sgabor for (i++; i <= p_end; i++) { 1120246074Sgabor len = pgets(true); 1121246074Sgabor p_input_line++; 1122246074Sgabor if (len == 0) 1123246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1124246074Sgabor p_input_line); 1125246074Sgabor if (*buf != '>') 1126246074Sgabor fatal("> expected at line %ld of patch\n", 1127246074Sgabor p_input_line); 1128328147Skevans /* Don't overrun if we don't have enough line */ 1129328147Skevans if (len > 2) 1130328147Skevans p_line[i] = savestr(buf + 2); 1131328147Skevans else 1132328147Skevans p_line[i] = savestr(""); 1133328147Skevans 1134246074Sgabor if (out_of_mem) { 1135246074Sgabor p_end = i - 1; 1136246074Sgabor return false; 1137246074Sgabor } 1138246074Sgabor p_len[i] = strlen(p_line[i]); 1139246074Sgabor p_char[i] = '+'; 1140246074Sgabor } 1141246074Sgabor 1142246074Sgabor if (remove_special_line()) { 1143246074Sgabor p_len[i - 1] -= 1; 1144246074Sgabor (p_line[i - 1])[p_len[i - 1]] = 0; 1145246074Sgabor } 1146246074Sgabor } 1147246074Sgabor if (reverse) /* backwards patch? */ 1148246074Sgabor if (!pch_swap()) 1149246074Sgabor say("Not enough memory to swap next hunk!\n"); 1150246074Sgabor#ifdef DEBUGGING 1151246074Sgabor if (debug & 2) { 1152298530Spfg LINENUM i; 1153246074Sgabor char special; 1154246074Sgabor 1155246074Sgabor for (i = 0; i <= p_end; i++) { 1156246074Sgabor if (i == p_ptrn_lines) 1157246074Sgabor special = '^'; 1158246074Sgabor else 1159246074Sgabor special = ' '; 1160298530Spfg fprintf(stderr, "%3ld %c %c %s", i, p_char[i], 1161246074Sgabor special, p_line[i]); 1162246074Sgabor fflush(stderr); 1163246074Sgabor } 1164246074Sgabor } 1165246074Sgabor#endif 1166246074Sgabor if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1167246074Sgabor p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1168246074Sgabor return true; 1169246074Sgabor} 1170246074Sgabor 1171246074Sgabor/* 1172246074Sgabor * Input a line from the patch file. 1173246074Sgabor * Worry about indentation if do_indent is true. 1174246074Sgabor * The line is read directly into the buf global variable which 1175246074Sgabor * is resized if necessary in order to hold the complete line. 1176246074Sgabor * Returns the number of characters read including the terminating 1177246074Sgabor * '\n', if any. 1178246074Sgabor */ 1179246074Sgaborsize_t 1180246074Sgaborpgets(bool do_indent) 1181246074Sgabor{ 1182246074Sgabor char *line; 1183246074Sgabor size_t len; 1184246074Sgabor int indent = 0, skipped = 0; 1185246074Sgabor 1186246074Sgabor line = fgetln(pfp, &len); 1187246074Sgabor if (line != NULL) { 1188246074Sgabor if (len + 1 > buf_size) { 1189246074Sgabor while (len + 1 > buf_size) 1190246074Sgabor buf_size *= 2; 1191246074Sgabor free(buf); 1192246074Sgabor buf = malloc(buf_size); 1193246074Sgabor if (buf == NULL) 1194246074Sgabor fatal("out of memory\n"); 1195246074Sgabor } 1196246074Sgabor if (do_indent == 1 && p_indent) { 1197246074Sgabor for (; 1198246074Sgabor indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1199246074Sgabor line++, skipped++) { 1200246074Sgabor if (*line == '\t') 1201246074Sgabor indent += 8 - (indent %7); 1202246074Sgabor else 1203246074Sgabor indent++; 1204246074Sgabor } 1205246074Sgabor } 1206252637Sobrien memcpy(buf, line, len - skipped); 1207246074Sgabor buf[len - skipped] = '\0'; 1208246074Sgabor } 1209246074Sgabor return len; 1210246074Sgabor} 1211246074Sgabor 1212246074Sgabor 1213246074Sgabor/* 1214246074Sgabor * Reverse the old and new portions of the current hunk. 1215246074Sgabor */ 1216246074Sgaborbool 1217246074Sgaborpch_swap(void) 1218246074Sgabor{ 1219246074Sgabor char **tp_line; /* the text of the hunk */ 1220267490Spfg unsigned short *tp_len;/* length of each line */ 1221246074Sgabor char *tp_char; /* +, -, and ! */ 1222246074Sgabor LINENUM i; 1223246074Sgabor LINENUM n; 1224246074Sgabor bool blankline = false; 1225246074Sgabor char *s; 1226246074Sgabor 1227246074Sgabor i = p_first; 1228246074Sgabor p_first = p_newfirst; 1229246074Sgabor p_newfirst = i; 1230246074Sgabor 1231246074Sgabor /* make a scratch copy */ 1232246074Sgabor 1233246074Sgabor tp_line = p_line; 1234246074Sgabor tp_len = p_len; 1235246074Sgabor tp_char = p_char; 1236246074Sgabor p_line = NULL; /* force set_hunkmax to allocate again */ 1237246074Sgabor p_len = NULL; 1238246074Sgabor p_char = NULL; 1239246074Sgabor set_hunkmax(); 1240246074Sgabor if (p_line == NULL || p_len == NULL || p_char == NULL) { 1241246074Sgabor 1242246074Sgabor free(p_line); 1243246074Sgabor p_line = tp_line; 1244246074Sgabor free(p_len); 1245246074Sgabor p_len = tp_len; 1246246074Sgabor free(p_char); 1247246074Sgabor p_char = tp_char; 1248246074Sgabor return false; /* not enough memory to swap hunk! */ 1249246074Sgabor } 1250246074Sgabor /* now turn the new into the old */ 1251246074Sgabor 1252246074Sgabor i = p_ptrn_lines + 1; 1253246074Sgabor if (tp_char[i] == '\n') { /* account for possible blank line */ 1254246074Sgabor blankline = true; 1255246074Sgabor i++; 1256246074Sgabor } 1257246074Sgabor if (p_efake >= 0) { /* fix non-freeable ptr range */ 1258246074Sgabor if (p_efake <= i) 1259246074Sgabor n = p_end - i + 1; 1260246074Sgabor else 1261246074Sgabor n = -i; 1262246074Sgabor p_efake += n; 1263246074Sgabor p_bfake += n; 1264246074Sgabor } 1265246074Sgabor for (n = 0; i <= p_end; i++, n++) { 1266246074Sgabor p_line[n] = tp_line[i]; 1267246074Sgabor p_char[n] = tp_char[i]; 1268246074Sgabor if (p_char[n] == '+') 1269246074Sgabor p_char[n] = '-'; 1270246074Sgabor p_len[n] = tp_len[i]; 1271246074Sgabor } 1272246074Sgabor if (blankline) { 1273246074Sgabor i = p_ptrn_lines + 1; 1274246074Sgabor p_line[n] = tp_line[i]; 1275246074Sgabor p_char[n] = tp_char[i]; 1276246074Sgabor p_len[n] = tp_len[i]; 1277246074Sgabor n++; 1278246074Sgabor } 1279246074Sgabor if (p_char[0] != '=') 1280246074Sgabor fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1281246074Sgabor p_input_line, p_char[0]); 1282246074Sgabor p_char[0] = '*'; 1283246074Sgabor for (s = p_line[0]; *s; s++) 1284246074Sgabor if (*s == '-') 1285246074Sgabor *s = '*'; 1286246074Sgabor 1287246074Sgabor /* now turn the old into the new */ 1288246074Sgabor 1289246074Sgabor if (p_char[0] != '*') 1290246074Sgabor fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1291246074Sgabor p_input_line, p_char[0]); 1292246074Sgabor tp_char[0] = '='; 1293246074Sgabor for (s = tp_line[0]; *s; s++) 1294246074Sgabor if (*s == '*') 1295246074Sgabor *s = '-'; 1296246074Sgabor for (i = 0; n <= p_end; i++, n++) { 1297246074Sgabor p_line[n] = tp_line[i]; 1298246074Sgabor p_char[n] = tp_char[i]; 1299246074Sgabor if (p_char[n] == '-') 1300246074Sgabor p_char[n] = '+'; 1301246074Sgabor p_len[n] = tp_len[i]; 1302246074Sgabor } 1303246074Sgabor 1304246074Sgabor if (i != p_ptrn_lines + 1) 1305246074Sgabor fatal("Malformed patch at line %ld: expected %ld lines, " 1306246074Sgabor "got %ld\n", 1307246074Sgabor p_input_line, p_ptrn_lines + 1, i); 1308246074Sgabor 1309246074Sgabor i = p_ptrn_lines; 1310246074Sgabor p_ptrn_lines = p_repl_lines; 1311246074Sgabor p_repl_lines = i; 1312246074Sgabor 1313246074Sgabor free(tp_line); 1314246074Sgabor free(tp_len); 1315246074Sgabor free(tp_char); 1316246074Sgabor 1317246074Sgabor return true; 1318246074Sgabor} 1319246074Sgabor 1320246074Sgabor/* 1321246074Sgabor * Return the specified line position in the old file of the old context. 1322246074Sgabor */ 1323246074SgaborLINENUM 1324246074Sgaborpch_first(void) 1325246074Sgabor{ 1326246074Sgabor return p_first; 1327246074Sgabor} 1328246074Sgabor 1329246074Sgabor/* 1330246074Sgabor * Return the number of lines of old context. 1331246074Sgabor */ 1332246074SgaborLINENUM 1333246074Sgaborpch_ptrn_lines(void) 1334246074Sgabor{ 1335246074Sgabor return p_ptrn_lines; 1336246074Sgabor} 1337246074Sgabor 1338246074Sgabor/* 1339246074Sgabor * Return the probable line position in the new file of the first line. 1340246074Sgabor */ 1341246074SgaborLINENUM 1342246074Sgaborpch_newfirst(void) 1343246074Sgabor{ 1344246074Sgabor return p_newfirst; 1345246074Sgabor} 1346246074Sgabor 1347246074Sgabor/* 1348246074Sgabor * Return the number of lines in the replacement text including context. 1349246074Sgabor */ 1350246074SgaborLINENUM 1351246074Sgaborpch_repl_lines(void) 1352246074Sgabor{ 1353246074Sgabor return p_repl_lines; 1354246074Sgabor} 1355246074Sgabor 1356246074Sgabor/* 1357246074Sgabor * Return the number of lines in the whole hunk. 1358246074Sgabor */ 1359246074SgaborLINENUM 1360246074Sgaborpch_end(void) 1361246074Sgabor{ 1362246074Sgabor return p_end; 1363246074Sgabor} 1364246074Sgabor 1365246074Sgabor/* 1366246074Sgabor * Return the number of context lines before the first changed line. 1367246074Sgabor */ 1368246074SgaborLINENUM 1369246074Sgaborpch_context(void) 1370246074Sgabor{ 1371246074Sgabor return p_context; 1372246074Sgabor} 1373246074Sgabor 1374246074Sgabor/* 1375246074Sgabor * Return the length of a particular patch line. 1376246074Sgabor */ 1377267490Spfgunsigned short 1378246074Sgaborpch_line_len(LINENUM line) 1379246074Sgabor{ 1380246074Sgabor return p_len[line]; 1381246074Sgabor} 1382246074Sgabor 1383246074Sgabor/* 1384246074Sgabor * Return the control character (+, -, *, !, etc) for a patch line. 1385246074Sgabor */ 1386246074Sgaborchar 1387246074Sgaborpch_char(LINENUM line) 1388246074Sgabor{ 1389246074Sgabor return p_char[line]; 1390246074Sgabor} 1391246074Sgabor 1392246074Sgabor/* 1393246074Sgabor * Return a pointer to a particular patch line. 1394246074Sgabor */ 1395246074Sgaborchar * 1396246074Sgaborpfetch(LINENUM line) 1397246074Sgabor{ 1398246074Sgabor return p_line[line]; 1399246074Sgabor} 1400246074Sgabor 1401246074Sgabor/* 1402246074Sgabor * Return where in the patch file this hunk began, for error messages. 1403246074Sgabor */ 1404246074SgaborLINENUM 1405246074Sgaborpch_hunk_beg(void) 1406246074Sgabor{ 1407246074Sgabor return p_hunk_beg; 1408246074Sgabor} 1409246074Sgabor 1410246074Sgabor/* 1411246074Sgabor * Apply an ed script by feeding ed itself. 1412246074Sgabor */ 1413246074Sgaborvoid 1414246074Sgabordo_ed_script(void) 1415246074Sgabor{ 1416246074Sgabor char *t; 1417275553Spfg off_t beginning_of_this_line; 1418246074Sgabor FILE *pipefp = NULL; 1419286346Sdelphij int continuation; 1420246074Sgabor 1421246074Sgabor if (!skip_rest_of_patch) { 1422246074Sgabor if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1423246074Sgabor unlink(TMPOUTNAME); 1424246074Sgabor fatal("can't create temp file %s", TMPOUTNAME); 1425246074Sgabor } 1426286346Sdelphij snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1427246074Sgabor verbose ? " " : " -s ", TMPOUTNAME); 1428246074Sgabor pipefp = popen(buf, "w"); 1429246074Sgabor } 1430246074Sgabor for (;;) { 1431275553Spfg beginning_of_this_line = ftello(pfp); 1432246074Sgabor if (pgets(true) == 0) { 1433246074Sgabor next_intuit_at(beginning_of_this_line, p_input_line); 1434246074Sgabor break; 1435246074Sgabor } 1436246074Sgabor p_input_line++; 1437246074Sgabor for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1438246074Sgabor ; 1439246074Sgabor /* POSIX defines allowed commands as {a,c,d,i,s} */ 1440275582Spfg if (isdigit((unsigned char)*buf) && 1441275582Spfg (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1442246074Sgabor if (pipefp != NULL) 1443246074Sgabor fputs(buf, pipefp); 1444286346Sdelphij if (*t == 's') { 1445286346Sdelphij for (;;) { 1446286346Sdelphij continuation = 0; 1447286346Sdelphij t = strchr(buf, '\0') - 1; 1448286346Sdelphij while (--t >= buf && *t == '\\') 1449286346Sdelphij continuation = !continuation; 1450286346Sdelphij if (!continuation || 1451286346Sdelphij pgets(true) == 0) 1452286346Sdelphij break; 1453286346Sdelphij if (pipefp != NULL) 1454286346Sdelphij fputs(buf, pipefp); 1455286346Sdelphij } 1456286346Sdelphij } else if (*t != 'd') { 1457246074Sgabor while (pgets(true)) { 1458246074Sgabor p_input_line++; 1459246074Sgabor if (pipefp != NULL) 1460246074Sgabor fputs(buf, pipefp); 1461246074Sgabor if (strEQ(buf, ".\n")) 1462246074Sgabor break; 1463246074Sgabor } 1464246074Sgabor } 1465246074Sgabor } else { 1466246074Sgabor next_intuit_at(beginning_of_this_line, p_input_line); 1467246074Sgabor break; 1468246074Sgabor } 1469246074Sgabor } 1470246074Sgabor if (pipefp == NULL) 1471246074Sgabor return; 1472246074Sgabor fprintf(pipefp, "w\n"); 1473246074Sgabor fprintf(pipefp, "q\n"); 1474246074Sgabor fflush(pipefp); 1475246074Sgabor pclose(pipefp); 1476246074Sgabor ignore_signals(); 1477246074Sgabor if (!check_only) { 1478246074Sgabor if (move_file(TMPOUTNAME, outname) < 0) { 1479246074Sgabor toutkeep = true; 1480246074Sgabor chmod(TMPOUTNAME, filemode); 1481246074Sgabor } else 1482246074Sgabor chmod(outname, filemode); 1483246074Sgabor } 1484246074Sgabor set_signals(1); 1485246074Sgabor} 1486246074Sgabor 1487246074Sgabor/* 1488246074Sgabor * Choose the name of the file to be patched based on POSIX rules. 1489246074Sgabor * NOTE: the POSIX rules are amazingly stupid and we only follow them 1490246074Sgabor * if the user specified --posix or set POSIXLY_CORRECT. 1491246074Sgabor */ 1492246074Sgaborstatic char * 1493246074Sgaborposix_name(const struct file_name *names, bool assume_exists) 1494246074Sgabor{ 1495246074Sgabor char *path = NULL; 1496246074Sgabor int i; 1497246074Sgabor 1498246074Sgabor /* 1499246074Sgabor * POSIX states that the filename will be chosen from one 1500246074Sgabor * of the old, new and index names (in that order) if 1501246074Sgabor * the file exists relative to CWD after -p stripping. 1502246074Sgabor */ 1503246074Sgabor for (i = 0; i < MAX_FILE; i++) { 1504246074Sgabor if (names[i].path != NULL && names[i].exists) { 1505246074Sgabor path = names[i].path; 1506246074Sgabor break; 1507246074Sgabor } 1508246074Sgabor } 1509246074Sgabor if (path == NULL && !assume_exists) { 1510246074Sgabor /* 1511286795Sdelphij * No files found, check to see if the diff could be 1512286795Sdelphij * creating a new file. 1513246074Sgabor */ 1514246074Sgabor if (path == NULL && ok_to_create_file && 1515246074Sgabor names[NEW_FILE].path != NULL) 1516246074Sgabor path = names[NEW_FILE].path; 1517246074Sgabor } 1518246074Sgabor 1519276218Spfg return path ? xstrdup(path) : NULL; 1520246074Sgabor} 1521246074Sgabor 1522246074Sgaborstatic char * 1523286795Sdelphijcompare_names(const struct file_name *names, bool assume_exists) 1524246074Sgabor{ 1525246074Sgabor size_t min_components, min_baselen, min_len, tmp; 1526246074Sgabor char *best = NULL; 1527255232Sse char *path; 1528246074Sgabor int i; 1529246074Sgabor 1530246074Sgabor /* 1531246074Sgabor * The "best" name is the one with the fewest number of path 1532246074Sgabor * components, the shortest basename length, and the shortest 1533246074Sgabor * overall length (in that order). We only use the Index: file 1534246074Sgabor * if neither of the old or new files could be intuited from 1535246074Sgabor * the diff header. 1536246074Sgabor */ 1537246074Sgabor min_components = min_baselen = min_len = SIZE_MAX; 1538246074Sgabor for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1539255232Sse path = names[i].path; 1540286795Sdelphij if (path == NULL || (!names[i].exists && !assume_exists)) 1541246074Sgabor continue; 1542255232Sse if ((tmp = num_components(path)) > min_components) 1543246074Sgabor continue; 1544250943Sse if (tmp < min_components) { 1545250943Sse min_components = tmp; 1546255232Sse best = path; 1547250943Sse } 1548255232Sse if ((tmp = strlen(basename(path))) > min_baselen) 1549246074Sgabor continue; 1550250943Sse if (tmp < min_baselen) { 1551250943Sse min_baselen = tmp; 1552255232Sse best = path; 1553250943Sse } 1554255232Sse if ((tmp = strlen(path)) > min_len) 1555246074Sgabor continue; 1556246074Sgabor min_len = tmp; 1557255232Sse best = path; 1558246074Sgabor } 1559255232Sse return best; 1560255232Sse} 1561255232Sse 1562255232Sse/* 1563255232Sse * Choose the name of the file to be patched based the "best" one 1564255232Sse * available. 1565255232Sse */ 1566255232Ssestatic char * 1567255232Ssebest_name(const struct file_name *names, bool assume_exists) 1568255232Sse{ 1569255232Sse char *best; 1570255232Sse 1571286795Sdelphij best = compare_names(names, assume_exists); 1572246074Sgabor 1573286795Sdelphij /* No match? Check to see if the diff could be creating a new file. */ 1574286795Sdelphij if (best == NULL && ok_to_create_file) 1575286795Sdelphij best = names[NEW_FILE].path; 1576286795Sdelphij 1577276218Spfg return best ? xstrdup(best) : NULL; 1578246074Sgabor} 1579246074Sgabor 1580246074Sgaborstatic size_t 1581246074Sgabornum_components(const char *path) 1582246074Sgabor{ 1583246074Sgabor size_t n; 1584246074Sgabor const char *cp; 1585246074Sgabor 1586246074Sgabor for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1587246074Sgabor while (*cp == '/') 1588246074Sgabor cp++; /* skip consecutive slashes */ 1589246074Sgabor } 1590246074Sgabor return n; 1591246074Sgabor} 1592275612Spfg 1593275612Spfg/* 1594275612Spfg * Convert number at NPTR into LINENUM and save address of first 1595275612Spfg * character that is not a digit in ENDPTR. If conversion is not 1596275612Spfg * possible, call fatal. 1597275612Spfg */ 1598275612Spfgstatic LINENUM 1599275612Spfgstrtolinenum(char *nptr, char **endptr) 1600275612Spfg{ 1601275612Spfg LINENUM rv; 1602275612Spfg char c; 1603275612Spfg char *p; 1604275612Spfg const char *errstr; 1605275612Spfg 1606275612Spfg for (p = nptr; isdigit((unsigned char)*p); p++) 1607275612Spfg ; 1608275612Spfg 1609275612Spfg if (p == nptr) 1610275612Spfg malformed(); 1611275612Spfg 1612275612Spfg c = *p; 1613275612Spfg *p = '\0'; 1614275612Spfg 1615275612Spfg rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1616275612Spfg if (errstr != NULL) 1617275612Spfg fatal("invalid line number at line %ld: `%s' is %s\n", 1618275612Spfg p_input_line, nptr, errstr); 1619276218Spfg 1620275612Spfg *p = c; 1621275612Spfg *endptr = p; 1622275612Spfg 1623275612Spfg return rv; 1624275612Spfg} 1625