pch.c revision 298530
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: head/usr.bin/patch/pch.c 298530 2016-04-24 04:08:36Z pfg $ 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) { 219246074Sgabor ask("No file found--skip this patch? [n] "); 220246074Sgabor if (*buf != 'y') 221246074Sgabor continue; 222246074Sgabor if (verbose) 223246074Sgabor say("Skipping patch...\n"); 224246074Sgabor free(filearg[0]); 225246074Sgabor filearg[0] = fetchname(bestguess, &exists, 0); 226246074Sgabor skip_rest_of_patch = true; 227246074Sgabor return true; 228246074Sgabor } 229246074Sgabor } 230246074Sgabor return true; 231246074Sgabor} 232246074Sgabor 233246074Sgaborstatic void 234246074Sgaborp4_fetchname(struct file_name *name, char *str) 235246074Sgabor{ 236246074Sgabor char *t, *h; 237246074Sgabor 238246074Sgabor /* Skip leading whitespace. */ 239246074Sgabor while (isspace((unsigned char)*str)) 240246074Sgabor str++; 241246074Sgabor 242246074Sgabor /* Remove the file revision number. */ 243246074Sgabor for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 244246074Sgabor if (*t == '#') 245246074Sgabor h = t; 246246074Sgabor if (h != NULL) 247246074Sgabor *h = '\0'; 248246074Sgabor 249246074Sgabor name->path = fetchname(str, &name->exists, strippath); 250246074Sgabor} 251246074Sgabor 252246074Sgabor/* Determine what kind of diff is in the remaining part of the patch file. */ 253246074Sgabor 254246074Sgaborstatic int 255246074Sgaborintuit_diff_type(void) 256246074Sgabor{ 257275553Spfg off_t this_line = 0, previous_line; 258275553Spfg off_t first_command_line = -1; 259246074Sgabor LINENUM fcl_line = -1; 260246074Sgabor bool last_line_was_command = false, this_is_a_command = false; 261246074Sgabor bool stars_last_line = false, stars_this_line = false; 262246074Sgabor char *s, *t; 263246074Sgabor int indent, retval; 264246074Sgabor struct file_name names[MAX_FILE]; 265246074Sgabor 266246074Sgabor memset(names, 0, sizeof(names)); 267246074Sgabor ok_to_create_file = false; 268275553Spfg fseeko(pfp, p_base, SEEK_SET); 269246074Sgabor p_input_line = p_bline - 1; 270246074Sgabor for (;;) { 271246074Sgabor previous_line = this_line; 272246074Sgabor last_line_was_command = this_is_a_command; 273246074Sgabor stars_last_line = stars_this_line; 274275553Spfg this_line = ftello(pfp); 275246074Sgabor indent = 0; 276246074Sgabor p_input_line++; 277246074Sgabor if (pgets(false) == 0) { 278275553Spfg if (first_command_line >= 0) { 279246074Sgabor /* nothing but deletes!? */ 280246074Sgabor p_start = first_command_line; 281246074Sgabor p_sline = fcl_line; 282246074Sgabor retval = ED_DIFF; 283246074Sgabor goto scan_exit; 284246074Sgabor } else { 285246074Sgabor p_start = this_line; 286246074Sgabor p_sline = p_input_line; 287246074Sgabor retval = 0; 288246074Sgabor goto scan_exit; 289246074Sgabor } 290246074Sgabor } 291246074Sgabor for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 292246074Sgabor if (*s == '\t') 293246074Sgabor indent += 8 - (indent % 8); 294246074Sgabor else 295246074Sgabor indent++; 296246074Sgabor } 297246074Sgabor for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 298246074Sgabor ; 299246074Sgabor this_is_a_command = (isdigit((unsigned char)*s) && 300246074Sgabor (*t == 'd' || *t == 'c' || *t == 'a')); 301275553Spfg if (first_command_line < 0 && this_is_a_command) { 302246074Sgabor first_command_line = this_line; 303246074Sgabor fcl_line = p_input_line; 304246074Sgabor p_indent = indent; /* assume this for now */ 305246074Sgabor } 306246074Sgabor if (!stars_last_line && strnEQ(s, "*** ", 4)) 307246074Sgabor names[OLD_FILE].path = fetchname(s + 4, 308246074Sgabor &names[OLD_FILE].exists, strippath); 309246074Sgabor else if (strnEQ(s, "--- ", 4)) 310246074Sgabor names[NEW_FILE].path = fetchname(s + 4, 311246074Sgabor &names[NEW_FILE].exists, strippath); 312246074Sgabor else if (strnEQ(s, "+++ ", 4)) 313246074Sgabor /* pretend it is the old name */ 314246074Sgabor names[OLD_FILE].path = fetchname(s + 4, 315246074Sgabor &names[OLD_FILE].exists, strippath); 316246074Sgabor else if (strnEQ(s, "Index:", 6)) 317246074Sgabor names[INDEX_FILE].path = fetchname(s + 6, 318246074Sgabor &names[INDEX_FILE].exists, strippath); 319246074Sgabor else if (strnEQ(s, "Prereq:", 7)) { 320246074Sgabor for (t = s + 7; isspace((unsigned char)*t); t++) 321246074Sgabor ; 322276218Spfg revision = xstrdup(t); 323275582Spfg for (t = revision; 324275582Spfg *t && !isspace((unsigned char)*t); t++) 325246074Sgabor ; 326246074Sgabor *t = '\0'; 327246074Sgabor if (*revision == '\0') { 328246074Sgabor free(revision); 329246074Sgabor revision = NULL; 330246074Sgabor } 331246074Sgabor } else if (strnEQ(s, "==== ", 5)) { 332246074Sgabor /* Perforce-style diffs. */ 333246074Sgabor if ((t = strstr(s + 5, " - ")) != NULL) 334246074Sgabor p4_fetchname(&names[NEW_FILE], t + 3); 335246074Sgabor p4_fetchname(&names[OLD_FILE], s + 5); 336246074Sgabor } 337246074Sgabor if ((!diff_type || diff_type == ED_DIFF) && 338275553Spfg first_command_line >= 0 && 339246074Sgabor strEQ(s, ".\n")) { 340246074Sgabor p_indent = indent; 341246074Sgabor p_start = first_command_line; 342246074Sgabor p_sline = fcl_line; 343246074Sgabor retval = ED_DIFF; 344246074Sgabor goto scan_exit; 345246074Sgabor } 346246074Sgabor if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 347246074Sgabor if (strnEQ(s + 4, "0,0", 3)) 348246074Sgabor ok_to_create_file = true; 349246074Sgabor p_indent = indent; 350246074Sgabor p_start = this_line; 351246074Sgabor p_sline = p_input_line; 352246074Sgabor retval = UNI_DIFF; 353246074Sgabor goto scan_exit; 354246074Sgabor } 355246074Sgabor stars_this_line = strnEQ(s, "********", 8); 356246074Sgabor if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 357246074Sgabor strnEQ(s, "*** ", 4)) { 358275612Spfg if (strtolinenum(s + 4, &s) == 0) 359246074Sgabor ok_to_create_file = true; 360246074Sgabor /* 361246074Sgabor * If this is a new context diff the character just 362275553Spfg * at the end of the line is a '*'. 363246074Sgabor */ 364275553Spfg while (*s && *s != '\n') 365246074Sgabor s++; 366246074Sgabor p_indent = indent; 367246074Sgabor p_start = previous_line; 368246074Sgabor p_sline = p_input_line - 1; 369246074Sgabor retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 370246074Sgabor goto scan_exit; 371246074Sgabor } 372246074Sgabor if ((!diff_type || diff_type == NORMAL_DIFF) && 373246074Sgabor last_line_was_command && 374246074Sgabor (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 375246074Sgabor p_start = previous_line; 376246074Sgabor p_sline = p_input_line - 1; 377246074Sgabor p_indent = indent; 378246074Sgabor retval = NORMAL_DIFF; 379246074Sgabor goto scan_exit; 380246074Sgabor } 381246074Sgabor } 382246074Sgaborscan_exit: 383246074Sgabor if (retval == UNI_DIFF) { 384246074Sgabor /* unswap old and new */ 385246074Sgabor struct file_name tmp = names[OLD_FILE]; 386246074Sgabor names[OLD_FILE] = names[NEW_FILE]; 387246074Sgabor names[NEW_FILE] = tmp; 388246074Sgabor } 389246074Sgabor if (filearg[0] == NULL) { 390246074Sgabor if (posix) 391246074Sgabor filearg[0] = posix_name(names, ok_to_create_file); 392246074Sgabor else { 393246074Sgabor /* Ignore the Index: name for context diffs, like GNU */ 394246074Sgabor if (names[OLD_FILE].path != NULL || 395246074Sgabor names[NEW_FILE].path != NULL) { 396246074Sgabor free(names[INDEX_FILE].path); 397246074Sgabor names[INDEX_FILE].path = NULL; 398246074Sgabor } 399246074Sgabor filearg[0] = best_name(names, ok_to_create_file); 400246074Sgabor } 401246074Sgabor } 402246074Sgabor 403246074Sgabor free(bestguess); 404246074Sgabor bestguess = NULL; 405246074Sgabor if (filearg[0] != NULL) 406276218Spfg bestguess = xstrdup(filearg[0]); 407246074Sgabor else if (!ok_to_create_file) { 408246074Sgabor /* 409246074Sgabor * We don't want to create a new file but we need a 410246074Sgabor * filename to set bestguess. Avoid setting filearg[0] 411246074Sgabor * so the file is not created automatically. 412246074Sgabor */ 413246074Sgabor if (posix) 414246074Sgabor bestguess = posix_name(names, true); 415246074Sgabor else 416246074Sgabor bestguess = best_name(names, true); 417246074Sgabor } 418246074Sgabor free(names[OLD_FILE].path); 419246074Sgabor free(names[NEW_FILE].path); 420246074Sgabor free(names[INDEX_FILE].path); 421246074Sgabor return retval; 422246074Sgabor} 423246074Sgabor 424246074Sgabor/* 425246074Sgabor * Remember where this patch ends so we know where to start up again. 426246074Sgabor */ 427246074Sgaborstatic void 428275553Spfgnext_intuit_at(off_t file_pos, LINENUM file_line) 429246074Sgabor{ 430246074Sgabor p_base = file_pos; 431246074Sgabor p_bline = file_line; 432246074Sgabor} 433246074Sgabor 434246074Sgabor/* 435275553Spfg * Basically a verbose fseeko() to the actual diff listing. 436246074Sgabor */ 437246074Sgaborstatic void 438275553Spfgskip_to(off_t file_pos, LINENUM file_line) 439246074Sgabor{ 440246074Sgabor size_t len; 441246074Sgabor 442246074Sgabor if (p_base > file_pos) 443275553Spfg fatal("Internal error: seek %lld>%lld\n", 444275553Spfg (long long)p_base, (long long)file_pos); 445246074Sgabor if (verbose && p_base < file_pos) { 446275553Spfg fseeko(pfp, p_base, SEEK_SET); 447246074Sgabor say("The text leading up to this was:\n--------------------------\n"); 448275553Spfg while (ftello(pfp) < file_pos) { 449246074Sgabor len = pgets(false); 450246074Sgabor if (len == 0) 451246074Sgabor fatal("Unexpected end of file\n"); 452246074Sgabor say("|%s", buf); 453246074Sgabor } 454246074Sgabor say("--------------------------\n"); 455246074Sgabor } else 456275553Spfg fseeko(pfp, file_pos, SEEK_SET); 457246074Sgabor p_input_line = file_line - 1; 458246074Sgabor} 459246074Sgabor 460246074Sgabor/* Make this a function for better debugging. */ 461246074Sgaborstatic void 462246074Sgabormalformed(void) 463246074Sgabor{ 464246074Sgabor fatal("malformed patch at line %ld: %s", p_input_line, buf); 465246074Sgabor /* about as informative as "Syntax error" in C */ 466246074Sgabor} 467246074Sgabor 468246074Sgabor/* 469246074Sgabor * True if the line has been discarded (i.e. it is a line saying 470246074Sgabor * "\ No newline at end of file".) 471246074Sgabor */ 472246074Sgaborstatic bool 473246074Sgaborremove_special_line(void) 474246074Sgabor{ 475246074Sgabor int c; 476246074Sgabor 477246074Sgabor c = fgetc(pfp); 478246074Sgabor if (c == '\\') { 479246074Sgabor do { 480246074Sgabor c = fgetc(pfp); 481246074Sgabor } while (c != EOF && c != '\n'); 482246074Sgabor 483246074Sgabor return true; 484246074Sgabor } 485246074Sgabor if (c != EOF) 486275553Spfg fseeko(pfp, -1, SEEK_CUR); 487246074Sgabor 488246074Sgabor return false; 489246074Sgabor} 490246074Sgabor 491246074Sgabor/* 492246074Sgabor * True if there is more of the current diff listing to process. 493246074Sgabor */ 494246074Sgaborbool 495246074Sgaboranother_hunk(void) 496246074Sgabor{ 497275553Spfg off_t line_beginning; /* file pos of the current line */ 498246074Sgabor LINENUM repl_beginning; /* index of --- line */ 499246074Sgabor LINENUM fillcnt; /* #lines of missing ptrn or repl */ 500246074Sgabor LINENUM fillsrc; /* index of first line to copy */ 501246074Sgabor LINENUM filldst; /* index of first missing line */ 502289677Seadler bool ptrn_spaces_eaten; /* ptrn was slightly malformed */ 503246074Sgabor bool repl_could_be_missing; /* no + or ! lines in this hunk */ 504246074Sgabor bool repl_missing; /* we are now backtracking */ 505275553Spfg off_t repl_backtrack_position; /* file pos of first repl line */ 506246074Sgabor LINENUM repl_patch_line; /* input line number for same */ 507246074Sgabor LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 508246074Sgabor char *s; 509246074Sgabor size_t len; 510246074Sgabor int context = 0; 511246074Sgabor 512246074Sgabor while (p_end >= 0) { 513246074Sgabor if (p_end == p_efake) 514246074Sgabor p_end = p_bfake; /* don't free twice */ 515246074Sgabor else 516246074Sgabor free(p_line[p_end]); 517246074Sgabor p_end--; 518246074Sgabor } 519246074Sgabor p_efake = -1; 520246074Sgabor 521246074Sgabor p_max = hunkmax; /* gets reduced when --- found */ 522246074Sgabor if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 523275553Spfg line_beginning = ftello(pfp); 524246074Sgabor repl_beginning = 0; 525246074Sgabor fillcnt = 0; 526246074Sgabor fillsrc = 0; 527246074Sgabor filldst = 0; 528246074Sgabor ptrn_spaces_eaten = false; 529246074Sgabor repl_could_be_missing = true; 530246074Sgabor repl_missing = false; 531246074Sgabor repl_backtrack_position = 0; 532246074Sgabor repl_patch_line = 0; 533246074Sgabor ptrn_copiable = 0; 534246074Sgabor 535246074Sgabor len = pgets(true); 536246074Sgabor p_input_line++; 537246074Sgabor if (len == 0 || strnNE(buf, "********", 8)) { 538246074Sgabor next_intuit_at(line_beginning, p_input_line); 539246074Sgabor return false; 540246074Sgabor } 541246074Sgabor p_context = 100; 542246074Sgabor p_hunk_beg = p_input_line + 1; 543246074Sgabor while (p_end < p_max) { 544275553Spfg line_beginning = ftello(pfp); 545246074Sgabor len = pgets(true); 546246074Sgabor p_input_line++; 547246074Sgabor if (len == 0) { 548246074Sgabor if (p_max - p_end < 4) { 549246074Sgabor /* assume blank lines got chopped */ 550246074Sgabor strlcpy(buf, " \n", buf_size); 551246074Sgabor } else { 552246074Sgabor if (repl_beginning && repl_could_be_missing) { 553246074Sgabor repl_missing = true; 554246074Sgabor goto hunk_done; 555246074Sgabor } 556246074Sgabor fatal("unexpected end of file in patch\n"); 557246074Sgabor } 558246074Sgabor } 559246074Sgabor p_end++; 560246074Sgabor if (p_end >= hunkmax) 561246074Sgabor fatal("Internal error: hunk larger than hunk " 562246074Sgabor "buffer size"); 563246074Sgabor p_char[p_end] = *buf; 564246074Sgabor p_line[p_end] = NULL; 565246074Sgabor switch (*buf) { 566246074Sgabor case '*': 567246074Sgabor if (strnEQ(buf, "********", 8)) { 568246074Sgabor if (repl_beginning && repl_could_be_missing) { 569246074Sgabor repl_missing = true; 570246074Sgabor goto hunk_done; 571246074Sgabor } else 572246074Sgabor fatal("unexpected end of hunk " 573246074Sgabor "at line %ld\n", 574246074Sgabor p_input_line); 575246074Sgabor } 576246074Sgabor if (p_end != 0) { 577246074Sgabor if (repl_beginning && repl_could_be_missing) { 578246074Sgabor repl_missing = true; 579246074Sgabor goto hunk_done; 580246074Sgabor } 581246074Sgabor fatal("unexpected *** at line %ld: %s", 582246074Sgabor p_input_line, buf); 583246074Sgabor } 584246074Sgabor context = 0; 585246074Sgabor p_line[p_end] = savestr(buf); 586246074Sgabor if (out_of_mem) { 587246074Sgabor p_end--; 588246074Sgabor return false; 589246074Sgabor } 590275582Spfg for (s = buf; 591275582Spfg *s && !isdigit((unsigned char)*s); s++) 592246074Sgabor ; 593246074Sgabor if (!*s) 594246074Sgabor malformed(); 595246074Sgabor if (strnEQ(s, "0,0", 3)) 596246074Sgabor memmove(s, s + 2, strlen(s + 2) + 1); 597275612Spfg p_first = strtolinenum(s, &s); 598246074Sgabor if (*s == ',') { 599275582Spfg for (; 600275582Spfg *s && !isdigit((unsigned char)*s); s++) 601246074Sgabor ; 602246074Sgabor if (!*s) 603246074Sgabor malformed(); 604275612Spfg p_ptrn_lines = strtolinenum(s, &s) - p_first + 1; 605275612Spfg if (p_ptrn_lines < 0) 606275612Spfg malformed(); 607246074Sgabor } else if (p_first) 608246074Sgabor p_ptrn_lines = 1; 609246074Sgabor else { 610246074Sgabor p_ptrn_lines = 0; 611246074Sgabor p_first = 1; 612246074Sgabor } 613275612Spfg if (p_first >= LINENUM_MAX - p_ptrn_lines || 614275612Spfg p_ptrn_lines >= LINENUM_MAX - 6) 615275612Spfg malformed(); 616246074Sgabor 617246074Sgabor /* we need this much at least */ 618246074Sgabor p_max = p_ptrn_lines + 6; 619246074Sgabor while (p_max >= hunkmax) 620246074Sgabor grow_hunkmax(); 621246074Sgabor p_max = hunkmax; 622246074Sgabor break; 623246074Sgabor case '-': 624246074Sgabor if (buf[1] == '-') { 625246074Sgabor if (repl_beginning || 626246074Sgabor (p_end != p_ptrn_lines + 1 + 627246074Sgabor (p_char[p_end - 1] == '\n'))) { 628246074Sgabor if (p_end == 1) { 629246074Sgabor /* 630246074Sgabor * `old' lines were omitted; 631246074Sgabor * set up to fill them in 632246074Sgabor * from 'new' context lines. 633246074Sgabor */ 634246074Sgabor p_end = p_ptrn_lines + 1; 635246074Sgabor fillsrc = p_end + 1; 636246074Sgabor filldst = 1; 637246074Sgabor fillcnt = p_ptrn_lines; 638246074Sgabor } else { 639246074Sgabor if (repl_beginning) { 640246074Sgabor if (repl_could_be_missing) { 641246074Sgabor repl_missing = true; 642246074Sgabor goto hunk_done; 643246074Sgabor } 644246074Sgabor fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 645246074Sgabor p_input_line, p_hunk_beg + repl_beginning); 646246074Sgabor } else { 647246074Sgabor fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 648246074Sgabor (p_end <= p_ptrn_lines 649246074Sgabor ? "Premature" 650246074Sgabor : "Overdue"), 651246074Sgabor p_input_line, p_hunk_beg); 652246074Sgabor } 653246074Sgabor } 654246074Sgabor } 655246074Sgabor repl_beginning = p_end; 656275553Spfg repl_backtrack_position = ftello(pfp); 657246074Sgabor repl_patch_line = p_input_line; 658246074Sgabor p_line[p_end] = savestr(buf); 659246074Sgabor if (out_of_mem) { 660246074Sgabor p_end--; 661246074Sgabor return false; 662246074Sgabor } 663246074Sgabor p_char[p_end] = '='; 664246074Sgabor for (s = buf; *s && !isdigit((unsigned char)*s); s++) 665246074Sgabor ; 666246074Sgabor if (!*s) 667246074Sgabor malformed(); 668275612Spfg p_newfirst = strtolinenum(s, &s); 669246074Sgabor if (*s == ',') { 670246074Sgabor for (; *s && !isdigit((unsigned char)*s); s++) 671246074Sgabor ; 672246074Sgabor if (!*s) 673246074Sgabor malformed(); 674275612Spfg p_repl_lines = strtolinenum(s, &s) - 675246074Sgabor p_newfirst + 1; 676275612Spfg if (p_repl_lines < 0) 677275612Spfg malformed(); 678246074Sgabor } else if (p_newfirst) 679246074Sgabor p_repl_lines = 1; 680246074Sgabor else { 681246074Sgabor p_repl_lines = 0; 682246074Sgabor p_newfirst = 1; 683246074Sgabor } 684275612Spfg if (p_newfirst >= LINENUM_MAX - p_repl_lines || 685275612Spfg p_repl_lines >= LINENUM_MAX - p_end) 686275612Spfg malformed(); 687246074Sgabor p_max = p_repl_lines + p_end; 688246074Sgabor if (p_max > MAXHUNKSIZE) 689246074Sgabor fatal("hunk too large (%ld lines) at line %ld: %s", 690246074Sgabor p_max, p_input_line, buf); 691246074Sgabor while (p_max >= hunkmax) 692246074Sgabor grow_hunkmax(); 693246074Sgabor if (p_repl_lines != ptrn_copiable && 694246074Sgabor (p_context != 0 || p_repl_lines != 1)) 695246074Sgabor repl_could_be_missing = false; 696246074Sgabor break; 697246074Sgabor } 698246074Sgabor goto change_line; 699246074Sgabor case '+': 700246074Sgabor case '!': 701246074Sgabor repl_could_be_missing = false; 702246074Sgabor change_line: 703246074Sgabor if (buf[1] == '\n' && canonicalize) 704246074Sgabor strlcpy(buf + 1, " \n", buf_size - 1); 705275582Spfg if (!isspace((unsigned char)buf[1]) && 706275582Spfg buf[1] != '>' && buf[1] != '<' && 707246074Sgabor repl_beginning && repl_could_be_missing) { 708246074Sgabor repl_missing = true; 709246074Sgabor goto hunk_done; 710246074Sgabor } 711246074Sgabor if (context >= 0) { 712246074Sgabor if (context < p_context) 713246074Sgabor p_context = context; 714246074Sgabor context = -1000; 715246074Sgabor } 716246074Sgabor p_line[p_end] = savestr(buf + 2); 717246074Sgabor if (out_of_mem) { 718246074Sgabor p_end--; 719246074Sgabor return false; 720246074Sgabor } 721246074Sgabor if (p_end == p_ptrn_lines) { 722246074Sgabor if (remove_special_line()) { 723246074Sgabor int l; 724246074Sgabor 725246074Sgabor l = strlen(p_line[p_end]) - 1; 726246074Sgabor (p_line[p_end])[l] = 0; 727246074Sgabor } 728246074Sgabor } 729246074Sgabor break; 730246074Sgabor case '\t': 731246074Sgabor case '\n': /* assume the 2 spaces got eaten */ 732246074Sgabor if (repl_beginning && repl_could_be_missing && 733246074Sgabor (!ptrn_spaces_eaten || 734246074Sgabor diff_type == NEW_CONTEXT_DIFF)) { 735246074Sgabor repl_missing = true; 736246074Sgabor goto hunk_done; 737246074Sgabor } 738246074Sgabor p_line[p_end] = savestr(buf); 739246074Sgabor if (out_of_mem) { 740246074Sgabor p_end--; 741246074Sgabor return false; 742246074Sgabor } 743246074Sgabor if (p_end != p_ptrn_lines + 1) { 744246074Sgabor ptrn_spaces_eaten |= (repl_beginning != 0); 745246074Sgabor context++; 746246074Sgabor if (!repl_beginning) 747246074Sgabor ptrn_copiable++; 748246074Sgabor p_char[p_end] = ' '; 749246074Sgabor } 750246074Sgabor break; 751246074Sgabor case ' ': 752246074Sgabor if (!isspace((unsigned char)buf[1]) && 753246074Sgabor repl_beginning && repl_could_be_missing) { 754246074Sgabor repl_missing = true; 755246074Sgabor goto hunk_done; 756246074Sgabor } 757246074Sgabor context++; 758246074Sgabor if (!repl_beginning) 759246074Sgabor ptrn_copiable++; 760246074Sgabor p_line[p_end] = savestr(buf + 2); 761246074Sgabor if (out_of_mem) { 762246074Sgabor p_end--; 763246074Sgabor return false; 764246074Sgabor } 765246074Sgabor break; 766246074Sgabor default: 767246074Sgabor if (repl_beginning && repl_could_be_missing) { 768246074Sgabor repl_missing = true; 769246074Sgabor goto hunk_done; 770246074Sgabor } 771246074Sgabor malformed(); 772246074Sgabor } 773246074Sgabor /* set up p_len for strncmp() so we don't have to */ 774246074Sgabor /* assume null termination */ 775246074Sgabor if (p_line[p_end]) 776246074Sgabor p_len[p_end] = strlen(p_line[p_end]); 777246074Sgabor else 778246074Sgabor p_len[p_end] = 0; 779246074Sgabor } 780246074Sgabor 781246074Sgaborhunk_done: 782246074Sgabor if (p_end >= 0 && !repl_beginning) 783246074Sgabor fatal("no --- found in patch at line %ld\n", pch_hunk_beg()); 784246074Sgabor 785246074Sgabor if (repl_missing) { 786246074Sgabor 787246074Sgabor /* reset state back to just after --- */ 788246074Sgabor p_input_line = repl_patch_line; 789246074Sgabor for (p_end--; p_end > repl_beginning; p_end--) 790246074Sgabor free(p_line[p_end]); 791275553Spfg fseeko(pfp, repl_backtrack_position, SEEK_SET); 792246074Sgabor 793246074Sgabor /* redundant 'new' context lines were omitted - set */ 794246074Sgabor /* up to fill them in from the old file context */ 795246074Sgabor if (!p_context && p_repl_lines == 1) { 796246074Sgabor p_repl_lines = 0; 797246074Sgabor p_max--; 798246074Sgabor } 799246074Sgabor fillsrc = 1; 800246074Sgabor filldst = repl_beginning + 1; 801246074Sgabor fillcnt = p_repl_lines; 802246074Sgabor p_end = p_max; 803246074Sgabor } else if (!p_context && fillcnt == 1) { 804246074Sgabor /* the first hunk was a null hunk with no context */ 805246074Sgabor /* and we were expecting one line -- fix it up. */ 806246074Sgabor while (filldst < p_end) { 807246074Sgabor p_line[filldst] = p_line[filldst + 1]; 808246074Sgabor p_char[filldst] = p_char[filldst + 1]; 809246074Sgabor p_len[filldst] = p_len[filldst + 1]; 810246074Sgabor filldst++; 811246074Sgabor } 812246074Sgabor#if 0 813246074Sgabor repl_beginning--; /* this doesn't need to be fixed */ 814246074Sgabor#endif 815246074Sgabor p_end--; 816246074Sgabor p_first++; /* do append rather than insert */ 817246074Sgabor fillcnt = 0; 818246074Sgabor p_ptrn_lines = 0; 819246074Sgabor } 820246074Sgabor if (diff_type == CONTEXT_DIFF && 821246074Sgabor (fillcnt || (p_first > 1 && ptrn_copiable > 2 * p_context))) { 822246074Sgabor if (verbose) 823246074Sgabor say("%s\n%s\n%s\n", 824246074Sgabor "(Fascinating--this is really a new-style context diff but without", 825246074Sgabor "the telltale extra asterisks on the *** line that usually indicate", 826246074Sgabor "the new style...)"); 827246074Sgabor diff_type = NEW_CONTEXT_DIFF; 828246074Sgabor } 829246074Sgabor /* if there were omitted context lines, fill them in now */ 830246074Sgabor if (fillcnt) { 831246074Sgabor p_bfake = filldst; /* remember where not to free() */ 832246074Sgabor p_efake = filldst + fillcnt - 1; 833246074Sgabor while (fillcnt-- > 0) { 834246074Sgabor while (fillsrc <= p_end && p_char[fillsrc] != ' ') 835246074Sgabor fillsrc++; 836246074Sgabor if (fillsrc > p_end) 837246074Sgabor fatal("replacement text or line numbers mangled in hunk at line %ld\n", 838246074Sgabor p_hunk_beg); 839246074Sgabor p_line[filldst] = p_line[fillsrc]; 840246074Sgabor p_char[filldst] = p_char[fillsrc]; 841246074Sgabor p_len[filldst] = p_len[fillsrc]; 842246074Sgabor fillsrc++; 843246074Sgabor filldst++; 844246074Sgabor } 845246074Sgabor while (fillsrc <= p_end && fillsrc != repl_beginning && 846246074Sgabor p_char[fillsrc] != ' ') 847246074Sgabor fillsrc++; 848246074Sgabor#ifdef DEBUGGING 849246074Sgabor if (debug & 64) 850246074Sgabor printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n", 851246074Sgabor fillsrc, filldst, repl_beginning, p_end + 1); 852246074Sgabor#endif 853246074Sgabor if (fillsrc != p_end + 1 && fillsrc != repl_beginning) 854246074Sgabor malformed(); 855246074Sgabor if (filldst != p_end + 1 && filldst != repl_beginning) 856246074Sgabor malformed(); 857246074Sgabor } 858246074Sgabor if (p_line[p_end] != NULL) { 859246074Sgabor if (remove_special_line()) { 860246074Sgabor p_len[p_end] -= 1; 861246074Sgabor (p_line[p_end])[p_len[p_end]] = 0; 862246074Sgabor } 863246074Sgabor } 864246074Sgabor } else if (diff_type == UNI_DIFF) { 865246074Sgabor LINENUM fillold; /* index of old lines */ 866246074Sgabor LINENUM fillnew; /* index of new lines */ 867246074Sgabor char ch; 868246074Sgabor 869275553Spfg line_beginning = ftello(pfp); /* file pos of the current line */ 870246074Sgabor len = pgets(true); 871246074Sgabor p_input_line++; 872246074Sgabor if (len == 0 || strnNE(buf, "@@ -", 4)) { 873246074Sgabor next_intuit_at(line_beginning, p_input_line); 874246074Sgabor return false; 875246074Sgabor } 876246074Sgabor s = buf + 4; 877246074Sgabor if (!*s) 878246074Sgabor malformed(); 879275612Spfg p_first = strtolinenum(s, &s); 880246074Sgabor if (*s == ',') { 881275612Spfg p_ptrn_lines = strtolinenum(s + 1, &s); 882246074Sgabor } else 883246074Sgabor p_ptrn_lines = 1; 884246074Sgabor if (*s == ' ') 885246074Sgabor s++; 886246074Sgabor if (*s != '+' || !*++s) 887246074Sgabor malformed(); 888275612Spfg p_newfirst = strtolinenum(s, &s); 889246074Sgabor if (*s == ',') { 890275612Spfg p_repl_lines = strtolinenum(s + 1, &s); 891246074Sgabor } else 892246074Sgabor p_repl_lines = 1; 893246074Sgabor if (*s == ' ') 894246074Sgabor s++; 895246074Sgabor if (*s != '@') 896246074Sgabor malformed(); 897275612Spfg if (p_first >= LINENUM_MAX - p_ptrn_lines || 898275612Spfg p_newfirst > LINENUM_MAX - p_repl_lines || 899275612Spfg p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 900275612Spfg malformed(); 901246074Sgabor if (!p_ptrn_lines) 902246074Sgabor p_first++; /* do append rather than insert */ 903246074Sgabor p_max = p_ptrn_lines + p_repl_lines + 1; 904246074Sgabor while (p_max >= hunkmax) 905246074Sgabor grow_hunkmax(); 906246074Sgabor fillold = 1; 907246074Sgabor fillnew = fillold + p_ptrn_lines; 908246074Sgabor p_end = fillnew + p_repl_lines; 909246074Sgabor snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 910246074Sgabor p_first + p_ptrn_lines - 1); 911246074Sgabor p_line[0] = savestr(buf); 912246074Sgabor if (out_of_mem) { 913246074Sgabor p_end = -1; 914246074Sgabor return false; 915246074Sgabor } 916246074Sgabor p_char[0] = '*'; 917246074Sgabor snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 918246074Sgabor p_newfirst + p_repl_lines - 1); 919246074Sgabor p_line[fillnew] = savestr(buf); 920246074Sgabor if (out_of_mem) { 921246074Sgabor p_end = 0; 922246074Sgabor return false; 923246074Sgabor } 924246074Sgabor p_char[fillnew++] = '='; 925246074Sgabor p_context = 100; 926246074Sgabor context = 0; 927246074Sgabor p_hunk_beg = p_input_line + 1; 928246074Sgabor while (fillold <= p_ptrn_lines || fillnew <= p_end) { 929275553Spfg line_beginning = ftello(pfp); 930246074Sgabor len = pgets(true); 931246074Sgabor p_input_line++; 932246074Sgabor if (len == 0) { 933246074Sgabor if (p_max - fillnew < 3) { 934246074Sgabor /* assume blank lines got chopped */ 935246074Sgabor strlcpy(buf, " \n", buf_size); 936246074Sgabor } else { 937246074Sgabor fatal("unexpected end of file in patch\n"); 938246074Sgabor } 939246074Sgabor } 940246074Sgabor if (*buf == '\t' || *buf == '\n') { 941246074Sgabor ch = ' '; /* assume the space got eaten */ 942246074Sgabor s = savestr(buf); 943246074Sgabor } else { 944246074Sgabor ch = *buf; 945246074Sgabor s = savestr(buf + 1); 946246074Sgabor } 947246074Sgabor if (out_of_mem) { 948246074Sgabor while (--fillnew > p_ptrn_lines) 949246074Sgabor free(p_line[fillnew]); 950246074Sgabor p_end = fillold - 1; 951246074Sgabor return false; 952246074Sgabor } 953246074Sgabor switch (ch) { 954246074Sgabor case '-': 955246074Sgabor if (fillold > p_ptrn_lines) { 956246074Sgabor free(s); 957246074Sgabor p_end = fillnew - 1; 958246074Sgabor malformed(); 959246074Sgabor } 960246074Sgabor p_char[fillold] = ch; 961246074Sgabor p_line[fillold] = s; 962246074Sgabor p_len[fillold++] = strlen(s); 963246074Sgabor if (fillold > p_ptrn_lines) { 964246074Sgabor if (remove_special_line()) { 965246074Sgabor p_len[fillold - 1] -= 1; 966246074Sgabor s[p_len[fillold - 1]] = 0; 967246074Sgabor } 968246074Sgabor } 969246074Sgabor break; 970246074Sgabor case '=': 971246074Sgabor ch = ' '; 972246074Sgabor /* FALL THROUGH */ 973246074Sgabor case ' ': 974246074Sgabor if (fillold > p_ptrn_lines) { 975246074Sgabor free(s); 976246074Sgabor while (--fillnew > p_ptrn_lines) 977246074Sgabor free(p_line[fillnew]); 978246074Sgabor p_end = fillold - 1; 979246074Sgabor malformed(); 980246074Sgabor } 981246074Sgabor context++; 982246074Sgabor p_char[fillold] = ch; 983246074Sgabor p_line[fillold] = s; 984246074Sgabor p_len[fillold++] = strlen(s); 985246074Sgabor s = savestr(s); 986246074Sgabor if (out_of_mem) { 987246074Sgabor while (--fillnew > p_ptrn_lines) 988246074Sgabor free(p_line[fillnew]); 989246074Sgabor p_end = fillold - 1; 990246074Sgabor return false; 991246074Sgabor } 992246074Sgabor if (fillold > p_ptrn_lines) { 993246074Sgabor if (remove_special_line()) { 994246074Sgabor p_len[fillold - 1] -= 1; 995246074Sgabor s[p_len[fillold - 1]] = 0; 996246074Sgabor } 997246074Sgabor } 998246074Sgabor /* FALL THROUGH */ 999246074Sgabor case '+': 1000246074Sgabor if (fillnew > p_end) { 1001246074Sgabor free(s); 1002246074Sgabor while (--fillnew > p_ptrn_lines) 1003246074Sgabor free(p_line[fillnew]); 1004246074Sgabor p_end = fillold - 1; 1005246074Sgabor malformed(); 1006246074Sgabor } 1007246074Sgabor p_char[fillnew] = ch; 1008246074Sgabor p_line[fillnew] = s; 1009246074Sgabor p_len[fillnew++] = strlen(s); 1010246074Sgabor if (fillold > p_ptrn_lines) { 1011246074Sgabor if (remove_special_line()) { 1012246074Sgabor p_len[fillnew - 1] -= 1; 1013246074Sgabor s[p_len[fillnew - 1]] = 0; 1014246074Sgabor } 1015246074Sgabor } 1016246074Sgabor break; 1017246074Sgabor default: 1018246074Sgabor p_end = fillnew; 1019246074Sgabor malformed(); 1020246074Sgabor } 1021246074Sgabor if (ch != ' ' && context > 0) { 1022246074Sgabor if (context < p_context) 1023246074Sgabor p_context = context; 1024246074Sgabor context = -1000; 1025246074Sgabor } 1026246074Sgabor } /* while */ 1027246074Sgabor } else { /* normal diff--fake it up */ 1028246074Sgabor char hunk_type; 1029246074Sgabor int i; 1030246074Sgabor LINENUM min, max; 1031246074Sgabor 1032275553Spfg line_beginning = ftello(pfp); 1033246074Sgabor p_context = 0; 1034246074Sgabor len = pgets(true); 1035246074Sgabor p_input_line++; 1036246074Sgabor if (len == 0 || !isdigit((unsigned char)*buf)) { 1037246074Sgabor next_intuit_at(line_beginning, p_input_line); 1038246074Sgabor return false; 1039246074Sgabor } 1040275612Spfg p_first = strtolinenum(buf, &s); 1041246074Sgabor if (*s == ',') { 1042275612Spfg p_ptrn_lines = strtolinenum(s + 1, &s) - p_first + 1; 1043275612Spfg if (p_ptrn_lines < 0) 1044275612Spfg malformed(); 1045246074Sgabor } else 1046246074Sgabor p_ptrn_lines = (*s != 'a'); 1047246074Sgabor hunk_type = *s; 1048246074Sgabor if (hunk_type == 'a') 1049246074Sgabor p_first++; /* do append rather than insert */ 1050275612Spfg min = strtolinenum(s + 1, &s); 1051246074Sgabor if (*s == ',') 1052275612Spfg max = strtolinenum(s + 1, &s); 1053246074Sgabor else 1054246074Sgabor max = min; 1055275612Spfg if (min < 0 || min > max || max - min == LINENUM_MAX) 1056275612Spfg malformed(); 1057246074Sgabor if (hunk_type == 'd') 1058246074Sgabor min++; 1059275612Spfg p_newfirst = min; 1060275612Spfg p_repl_lines = max - min + 1; 1061275612Spfg if (p_newfirst > LINENUM_MAX - p_repl_lines || 1062275612Spfg p_ptrn_lines >= LINENUM_MAX - p_repl_lines - 1) 1063275612Spfg malformed(); 1064275612Spfg p_end = p_ptrn_lines + p_repl_lines + 1; 1065246074Sgabor if (p_end > MAXHUNKSIZE) 1066246074Sgabor fatal("hunk too large (%ld lines) at line %ld: %s", 1067246074Sgabor p_end, p_input_line, buf); 1068246074Sgabor while (p_end >= hunkmax) 1069246074Sgabor grow_hunkmax(); 1070246074Sgabor snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1071246074Sgabor p_first + p_ptrn_lines - 1); 1072246074Sgabor p_line[0] = savestr(buf); 1073246074Sgabor if (out_of_mem) { 1074246074Sgabor p_end = -1; 1075246074Sgabor return false; 1076246074Sgabor } 1077246074Sgabor p_char[0] = '*'; 1078246074Sgabor for (i = 1; i <= p_ptrn_lines; i++) { 1079246074Sgabor len = pgets(true); 1080246074Sgabor p_input_line++; 1081246074Sgabor if (len == 0) 1082246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1083246074Sgabor p_input_line); 1084246074Sgabor if (*buf != '<') 1085246074Sgabor fatal("< expected at line %ld of patch\n", 1086246074Sgabor p_input_line); 1087246074Sgabor p_line[i] = savestr(buf + 2); 1088246074Sgabor if (out_of_mem) { 1089246074Sgabor p_end = i - 1; 1090246074Sgabor return false; 1091246074Sgabor } 1092246074Sgabor p_len[i] = strlen(p_line[i]); 1093246074Sgabor p_char[i] = '-'; 1094246074Sgabor } 1095246074Sgabor 1096246074Sgabor if (remove_special_line()) { 1097246074Sgabor p_len[i - 1] -= 1; 1098246074Sgabor (p_line[i - 1])[p_len[i - 1]] = 0; 1099246074Sgabor } 1100246074Sgabor if (hunk_type == 'c') { 1101246074Sgabor len = pgets(true); 1102246074Sgabor p_input_line++; 1103246074Sgabor if (len == 0) 1104246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1105246074Sgabor p_input_line); 1106246074Sgabor if (*buf != '-') 1107246074Sgabor fatal("--- expected at line %ld of patch\n", 1108246074Sgabor p_input_line); 1109246074Sgabor } 1110246074Sgabor snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1111246074Sgabor p_line[i] = savestr(buf); 1112246074Sgabor if (out_of_mem) { 1113246074Sgabor p_end = i - 1; 1114246074Sgabor return false; 1115246074Sgabor } 1116246074Sgabor p_char[i] = '='; 1117246074Sgabor for (i++; i <= p_end; i++) { 1118246074Sgabor len = pgets(true); 1119246074Sgabor p_input_line++; 1120246074Sgabor if (len == 0) 1121246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1122246074Sgabor p_input_line); 1123246074Sgabor if (*buf != '>') 1124246074Sgabor fatal("> expected at line %ld of patch\n", 1125246074Sgabor p_input_line); 1126246074Sgabor p_line[i] = savestr(buf + 2); 1127246074Sgabor if (out_of_mem) { 1128246074Sgabor p_end = i - 1; 1129246074Sgabor return false; 1130246074Sgabor } 1131246074Sgabor p_len[i] = strlen(p_line[i]); 1132246074Sgabor p_char[i] = '+'; 1133246074Sgabor } 1134246074Sgabor 1135246074Sgabor if (remove_special_line()) { 1136246074Sgabor p_len[i - 1] -= 1; 1137246074Sgabor (p_line[i - 1])[p_len[i - 1]] = 0; 1138246074Sgabor } 1139246074Sgabor } 1140246074Sgabor if (reverse) /* backwards patch? */ 1141246074Sgabor if (!pch_swap()) 1142246074Sgabor say("Not enough memory to swap next hunk!\n"); 1143246074Sgabor#ifdef DEBUGGING 1144246074Sgabor if (debug & 2) { 1145298530Spfg LINENUM i; 1146246074Sgabor char special; 1147246074Sgabor 1148246074Sgabor for (i = 0; i <= p_end; i++) { 1149246074Sgabor if (i == p_ptrn_lines) 1150246074Sgabor special = '^'; 1151246074Sgabor else 1152246074Sgabor special = ' '; 1153298530Spfg fprintf(stderr, "%3ld %c %c %s", i, p_char[i], 1154246074Sgabor special, p_line[i]); 1155246074Sgabor fflush(stderr); 1156246074Sgabor } 1157246074Sgabor } 1158246074Sgabor#endif 1159246074Sgabor if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1160246074Sgabor p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1161246074Sgabor return true; 1162246074Sgabor} 1163246074Sgabor 1164246074Sgabor/* 1165246074Sgabor * Input a line from the patch file. 1166246074Sgabor * Worry about indentation if do_indent is true. 1167246074Sgabor * The line is read directly into the buf global variable which 1168246074Sgabor * is resized if necessary in order to hold the complete line. 1169246074Sgabor * Returns the number of characters read including the terminating 1170246074Sgabor * '\n', if any. 1171246074Sgabor */ 1172246074Sgaborsize_t 1173246074Sgaborpgets(bool do_indent) 1174246074Sgabor{ 1175246074Sgabor char *line; 1176246074Sgabor size_t len; 1177246074Sgabor int indent = 0, skipped = 0; 1178246074Sgabor 1179246074Sgabor line = fgetln(pfp, &len); 1180246074Sgabor if (line != NULL) { 1181246074Sgabor if (len + 1 > buf_size) { 1182246074Sgabor while (len + 1 > buf_size) 1183246074Sgabor buf_size *= 2; 1184246074Sgabor free(buf); 1185246074Sgabor buf = malloc(buf_size); 1186246074Sgabor if (buf == NULL) 1187246074Sgabor fatal("out of memory\n"); 1188246074Sgabor } 1189246074Sgabor if (do_indent == 1 && p_indent) { 1190246074Sgabor for (; 1191246074Sgabor indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1192246074Sgabor line++, skipped++) { 1193246074Sgabor if (*line == '\t') 1194246074Sgabor indent += 8 - (indent %7); 1195246074Sgabor else 1196246074Sgabor indent++; 1197246074Sgabor } 1198246074Sgabor } 1199252637Sobrien memcpy(buf, line, len - skipped); 1200246074Sgabor buf[len - skipped] = '\0'; 1201246074Sgabor } 1202246074Sgabor return len; 1203246074Sgabor} 1204246074Sgabor 1205246074Sgabor 1206246074Sgabor/* 1207246074Sgabor * Reverse the old and new portions of the current hunk. 1208246074Sgabor */ 1209246074Sgaborbool 1210246074Sgaborpch_swap(void) 1211246074Sgabor{ 1212246074Sgabor char **tp_line; /* the text of the hunk */ 1213267490Spfg unsigned short *tp_len;/* length of each line */ 1214246074Sgabor char *tp_char; /* +, -, and ! */ 1215246074Sgabor LINENUM i; 1216246074Sgabor LINENUM n; 1217246074Sgabor bool blankline = false; 1218246074Sgabor char *s; 1219246074Sgabor 1220246074Sgabor i = p_first; 1221246074Sgabor p_first = p_newfirst; 1222246074Sgabor p_newfirst = i; 1223246074Sgabor 1224246074Sgabor /* make a scratch copy */ 1225246074Sgabor 1226246074Sgabor tp_line = p_line; 1227246074Sgabor tp_len = p_len; 1228246074Sgabor tp_char = p_char; 1229246074Sgabor p_line = NULL; /* force set_hunkmax to allocate again */ 1230246074Sgabor p_len = NULL; 1231246074Sgabor p_char = NULL; 1232246074Sgabor set_hunkmax(); 1233246074Sgabor if (p_line == NULL || p_len == NULL || p_char == NULL) { 1234246074Sgabor 1235246074Sgabor free(p_line); 1236246074Sgabor p_line = tp_line; 1237246074Sgabor free(p_len); 1238246074Sgabor p_len = tp_len; 1239246074Sgabor free(p_char); 1240246074Sgabor p_char = tp_char; 1241246074Sgabor return false; /* not enough memory to swap hunk! */ 1242246074Sgabor } 1243246074Sgabor /* now turn the new into the old */ 1244246074Sgabor 1245246074Sgabor i = p_ptrn_lines + 1; 1246246074Sgabor if (tp_char[i] == '\n') { /* account for possible blank line */ 1247246074Sgabor blankline = true; 1248246074Sgabor i++; 1249246074Sgabor } 1250246074Sgabor if (p_efake >= 0) { /* fix non-freeable ptr range */ 1251246074Sgabor if (p_efake <= i) 1252246074Sgabor n = p_end - i + 1; 1253246074Sgabor else 1254246074Sgabor n = -i; 1255246074Sgabor p_efake += n; 1256246074Sgabor p_bfake += n; 1257246074Sgabor } 1258246074Sgabor for (n = 0; i <= p_end; i++, n++) { 1259246074Sgabor p_line[n] = tp_line[i]; 1260246074Sgabor p_char[n] = tp_char[i]; 1261246074Sgabor if (p_char[n] == '+') 1262246074Sgabor p_char[n] = '-'; 1263246074Sgabor p_len[n] = tp_len[i]; 1264246074Sgabor } 1265246074Sgabor if (blankline) { 1266246074Sgabor i = p_ptrn_lines + 1; 1267246074Sgabor p_line[n] = tp_line[i]; 1268246074Sgabor p_char[n] = tp_char[i]; 1269246074Sgabor p_len[n] = tp_len[i]; 1270246074Sgabor n++; 1271246074Sgabor } 1272246074Sgabor if (p_char[0] != '=') 1273246074Sgabor fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1274246074Sgabor p_input_line, p_char[0]); 1275246074Sgabor p_char[0] = '*'; 1276246074Sgabor for (s = p_line[0]; *s; s++) 1277246074Sgabor if (*s == '-') 1278246074Sgabor *s = '*'; 1279246074Sgabor 1280246074Sgabor /* now turn the old into the new */ 1281246074Sgabor 1282246074Sgabor if (p_char[0] != '*') 1283246074Sgabor fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1284246074Sgabor p_input_line, p_char[0]); 1285246074Sgabor tp_char[0] = '='; 1286246074Sgabor for (s = tp_line[0]; *s; s++) 1287246074Sgabor if (*s == '*') 1288246074Sgabor *s = '-'; 1289246074Sgabor for (i = 0; n <= p_end; i++, n++) { 1290246074Sgabor p_line[n] = tp_line[i]; 1291246074Sgabor p_char[n] = tp_char[i]; 1292246074Sgabor if (p_char[n] == '-') 1293246074Sgabor p_char[n] = '+'; 1294246074Sgabor p_len[n] = tp_len[i]; 1295246074Sgabor } 1296246074Sgabor 1297246074Sgabor if (i != p_ptrn_lines + 1) 1298246074Sgabor fatal("Malformed patch at line %ld: expected %ld lines, " 1299246074Sgabor "got %ld\n", 1300246074Sgabor p_input_line, p_ptrn_lines + 1, i); 1301246074Sgabor 1302246074Sgabor i = p_ptrn_lines; 1303246074Sgabor p_ptrn_lines = p_repl_lines; 1304246074Sgabor p_repl_lines = i; 1305246074Sgabor 1306246074Sgabor free(tp_line); 1307246074Sgabor free(tp_len); 1308246074Sgabor free(tp_char); 1309246074Sgabor 1310246074Sgabor return true; 1311246074Sgabor} 1312246074Sgabor 1313246074Sgabor/* 1314246074Sgabor * Return the specified line position in the old file of the old context. 1315246074Sgabor */ 1316246074SgaborLINENUM 1317246074Sgaborpch_first(void) 1318246074Sgabor{ 1319246074Sgabor return p_first; 1320246074Sgabor} 1321246074Sgabor 1322246074Sgabor/* 1323246074Sgabor * Return the number of lines of old context. 1324246074Sgabor */ 1325246074SgaborLINENUM 1326246074Sgaborpch_ptrn_lines(void) 1327246074Sgabor{ 1328246074Sgabor return p_ptrn_lines; 1329246074Sgabor} 1330246074Sgabor 1331246074Sgabor/* 1332246074Sgabor * Return the probable line position in the new file of the first line. 1333246074Sgabor */ 1334246074SgaborLINENUM 1335246074Sgaborpch_newfirst(void) 1336246074Sgabor{ 1337246074Sgabor return p_newfirst; 1338246074Sgabor} 1339246074Sgabor 1340246074Sgabor/* 1341246074Sgabor * Return the number of lines in the replacement text including context. 1342246074Sgabor */ 1343246074SgaborLINENUM 1344246074Sgaborpch_repl_lines(void) 1345246074Sgabor{ 1346246074Sgabor return p_repl_lines; 1347246074Sgabor} 1348246074Sgabor 1349246074Sgabor/* 1350246074Sgabor * Return the number of lines in the whole hunk. 1351246074Sgabor */ 1352246074SgaborLINENUM 1353246074Sgaborpch_end(void) 1354246074Sgabor{ 1355246074Sgabor return p_end; 1356246074Sgabor} 1357246074Sgabor 1358246074Sgabor/* 1359246074Sgabor * Return the number of context lines before the first changed line. 1360246074Sgabor */ 1361246074SgaborLINENUM 1362246074Sgaborpch_context(void) 1363246074Sgabor{ 1364246074Sgabor return p_context; 1365246074Sgabor} 1366246074Sgabor 1367246074Sgabor/* 1368246074Sgabor * Return the length of a particular patch line. 1369246074Sgabor */ 1370267490Spfgunsigned short 1371246074Sgaborpch_line_len(LINENUM line) 1372246074Sgabor{ 1373246074Sgabor return p_len[line]; 1374246074Sgabor} 1375246074Sgabor 1376246074Sgabor/* 1377246074Sgabor * Return the control character (+, -, *, !, etc) for a patch line. 1378246074Sgabor */ 1379246074Sgaborchar 1380246074Sgaborpch_char(LINENUM line) 1381246074Sgabor{ 1382246074Sgabor return p_char[line]; 1383246074Sgabor} 1384246074Sgabor 1385246074Sgabor/* 1386246074Sgabor * Return a pointer to a particular patch line. 1387246074Sgabor */ 1388246074Sgaborchar * 1389246074Sgaborpfetch(LINENUM line) 1390246074Sgabor{ 1391246074Sgabor return p_line[line]; 1392246074Sgabor} 1393246074Sgabor 1394246074Sgabor/* 1395246074Sgabor * Return where in the patch file this hunk began, for error messages. 1396246074Sgabor */ 1397246074SgaborLINENUM 1398246074Sgaborpch_hunk_beg(void) 1399246074Sgabor{ 1400246074Sgabor return p_hunk_beg; 1401246074Sgabor} 1402246074Sgabor 1403246074Sgabor/* 1404246074Sgabor * Apply an ed script by feeding ed itself. 1405246074Sgabor */ 1406246074Sgaborvoid 1407246074Sgabordo_ed_script(void) 1408246074Sgabor{ 1409246074Sgabor char *t; 1410275553Spfg off_t beginning_of_this_line; 1411246074Sgabor FILE *pipefp = NULL; 1412286346Sdelphij int continuation; 1413246074Sgabor 1414246074Sgabor if (!skip_rest_of_patch) { 1415246074Sgabor if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1416246074Sgabor unlink(TMPOUTNAME); 1417246074Sgabor fatal("can't create temp file %s", TMPOUTNAME); 1418246074Sgabor } 1419286346Sdelphij snprintf(buf, buf_size, "%s%s%s", _PATH_RED, 1420246074Sgabor verbose ? " " : " -s ", TMPOUTNAME); 1421246074Sgabor pipefp = popen(buf, "w"); 1422246074Sgabor } 1423246074Sgabor for (;;) { 1424275553Spfg beginning_of_this_line = ftello(pfp); 1425246074Sgabor if (pgets(true) == 0) { 1426246074Sgabor next_intuit_at(beginning_of_this_line, p_input_line); 1427246074Sgabor break; 1428246074Sgabor } 1429246074Sgabor p_input_line++; 1430246074Sgabor for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1431246074Sgabor ; 1432246074Sgabor /* POSIX defines allowed commands as {a,c,d,i,s} */ 1433275582Spfg if (isdigit((unsigned char)*buf) && 1434275582Spfg (*t == 'a' || *t == 'c' || *t == 'd' || *t == 'i' || *t == 's')) { 1435246074Sgabor if (pipefp != NULL) 1436246074Sgabor fputs(buf, pipefp); 1437286346Sdelphij if (*t == 's') { 1438286346Sdelphij for (;;) { 1439286346Sdelphij continuation = 0; 1440286346Sdelphij t = strchr(buf, '\0') - 1; 1441286346Sdelphij while (--t >= buf && *t == '\\') 1442286346Sdelphij continuation = !continuation; 1443286346Sdelphij if (!continuation || 1444286346Sdelphij pgets(true) == 0) 1445286346Sdelphij break; 1446286346Sdelphij if (pipefp != NULL) 1447286346Sdelphij fputs(buf, pipefp); 1448286346Sdelphij } 1449286346Sdelphij } else if (*t != 'd') { 1450246074Sgabor while (pgets(true)) { 1451246074Sgabor p_input_line++; 1452246074Sgabor if (pipefp != NULL) 1453246074Sgabor fputs(buf, pipefp); 1454246074Sgabor if (strEQ(buf, ".\n")) 1455246074Sgabor break; 1456246074Sgabor } 1457246074Sgabor } 1458246074Sgabor } else { 1459246074Sgabor next_intuit_at(beginning_of_this_line, p_input_line); 1460246074Sgabor break; 1461246074Sgabor } 1462246074Sgabor } 1463246074Sgabor if (pipefp == NULL) 1464246074Sgabor return; 1465246074Sgabor fprintf(pipefp, "w\n"); 1466246074Sgabor fprintf(pipefp, "q\n"); 1467246074Sgabor fflush(pipefp); 1468246074Sgabor pclose(pipefp); 1469246074Sgabor ignore_signals(); 1470246074Sgabor if (!check_only) { 1471246074Sgabor if (move_file(TMPOUTNAME, outname) < 0) { 1472246074Sgabor toutkeep = true; 1473246074Sgabor chmod(TMPOUTNAME, filemode); 1474246074Sgabor } else 1475246074Sgabor chmod(outname, filemode); 1476246074Sgabor } 1477246074Sgabor set_signals(1); 1478246074Sgabor} 1479246074Sgabor 1480246074Sgabor/* 1481246074Sgabor * Choose the name of the file to be patched based on POSIX rules. 1482246074Sgabor * NOTE: the POSIX rules are amazingly stupid and we only follow them 1483246074Sgabor * if the user specified --posix or set POSIXLY_CORRECT. 1484246074Sgabor */ 1485246074Sgaborstatic char * 1486246074Sgaborposix_name(const struct file_name *names, bool assume_exists) 1487246074Sgabor{ 1488246074Sgabor char *path = NULL; 1489246074Sgabor int i; 1490246074Sgabor 1491246074Sgabor /* 1492246074Sgabor * POSIX states that the filename will be chosen from one 1493246074Sgabor * of the old, new and index names (in that order) if 1494246074Sgabor * the file exists relative to CWD after -p stripping. 1495246074Sgabor */ 1496246074Sgabor for (i = 0; i < MAX_FILE; i++) { 1497246074Sgabor if (names[i].path != NULL && names[i].exists) { 1498246074Sgabor path = names[i].path; 1499246074Sgabor break; 1500246074Sgabor } 1501246074Sgabor } 1502246074Sgabor if (path == NULL && !assume_exists) { 1503246074Sgabor /* 1504286795Sdelphij * No files found, check to see if the diff could be 1505286795Sdelphij * creating a new file. 1506246074Sgabor */ 1507246074Sgabor if (path == NULL && ok_to_create_file && 1508246074Sgabor names[NEW_FILE].path != NULL) 1509246074Sgabor path = names[NEW_FILE].path; 1510246074Sgabor } 1511246074Sgabor 1512276218Spfg return path ? xstrdup(path) : NULL; 1513246074Sgabor} 1514246074Sgabor 1515246074Sgaborstatic char * 1516286795Sdelphijcompare_names(const struct file_name *names, bool assume_exists) 1517246074Sgabor{ 1518246074Sgabor size_t min_components, min_baselen, min_len, tmp; 1519246074Sgabor char *best = NULL; 1520255232Sse char *path; 1521246074Sgabor int i; 1522246074Sgabor 1523246074Sgabor /* 1524246074Sgabor * The "best" name is the one with the fewest number of path 1525246074Sgabor * components, the shortest basename length, and the shortest 1526246074Sgabor * overall length (in that order). We only use the Index: file 1527246074Sgabor * if neither of the old or new files could be intuited from 1528246074Sgabor * the diff header. 1529246074Sgabor */ 1530246074Sgabor min_components = min_baselen = min_len = SIZE_MAX; 1531246074Sgabor for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1532255232Sse path = names[i].path; 1533286795Sdelphij if (path == NULL || (!names[i].exists && !assume_exists)) 1534246074Sgabor continue; 1535255232Sse if ((tmp = num_components(path)) > min_components) 1536246074Sgabor continue; 1537250943Sse if (tmp < min_components) { 1538250943Sse min_components = tmp; 1539255232Sse best = path; 1540250943Sse } 1541255232Sse if ((tmp = strlen(basename(path))) > min_baselen) 1542246074Sgabor continue; 1543250943Sse if (tmp < min_baselen) { 1544250943Sse min_baselen = tmp; 1545255232Sse best = path; 1546250943Sse } 1547255232Sse if ((tmp = strlen(path)) > min_len) 1548246074Sgabor continue; 1549246074Sgabor min_len = tmp; 1550255232Sse best = path; 1551246074Sgabor } 1552255232Sse return best; 1553255232Sse} 1554255232Sse 1555255232Sse/* 1556255232Sse * Choose the name of the file to be patched based the "best" one 1557255232Sse * available. 1558255232Sse */ 1559255232Ssestatic char * 1560255232Ssebest_name(const struct file_name *names, bool assume_exists) 1561255232Sse{ 1562255232Sse char *best; 1563255232Sse 1564286795Sdelphij best = compare_names(names, assume_exists); 1565246074Sgabor 1566286795Sdelphij /* No match? Check to see if the diff could be creating a new file. */ 1567286795Sdelphij if (best == NULL && ok_to_create_file) 1568286795Sdelphij best = names[NEW_FILE].path; 1569286795Sdelphij 1570276218Spfg return best ? xstrdup(best) : NULL; 1571246074Sgabor} 1572246074Sgabor 1573246074Sgaborstatic size_t 1574246074Sgabornum_components(const char *path) 1575246074Sgabor{ 1576246074Sgabor size_t n; 1577246074Sgabor const char *cp; 1578246074Sgabor 1579246074Sgabor for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1580246074Sgabor while (*cp == '/') 1581246074Sgabor cp++; /* skip consecutive slashes */ 1582246074Sgabor } 1583246074Sgabor return n; 1584246074Sgabor} 1585275612Spfg 1586275612Spfg/* 1587275612Spfg * Convert number at NPTR into LINENUM and save address of first 1588275612Spfg * character that is not a digit in ENDPTR. If conversion is not 1589275612Spfg * possible, call fatal. 1590275612Spfg */ 1591275612Spfgstatic LINENUM 1592275612Spfgstrtolinenum(char *nptr, char **endptr) 1593275612Spfg{ 1594275612Spfg LINENUM rv; 1595275612Spfg char c; 1596275612Spfg char *p; 1597275612Spfg const char *errstr; 1598275612Spfg 1599275612Spfg for (p = nptr; isdigit((unsigned char)*p); p++) 1600275612Spfg ; 1601275612Spfg 1602275612Spfg if (p == nptr) 1603275612Spfg malformed(); 1604275612Spfg 1605275612Spfg c = *p; 1606275612Spfg *p = '\0'; 1607275612Spfg 1608275612Spfg rv = strtonum(nptr, 0, LINENUM_MAX, &errstr); 1609275612Spfg if (errstr != NULL) 1610275612Spfg fatal("invalid line number at line %ld: `%s' is %s\n", 1611275612Spfg p_input_line, nptr, errstr); 1612276218Spfg 1613275612Spfg *p = c; 1614275612Spfg *endptr = p; 1615275612Spfg 1616275612Spfg return rv; 1617275612Spfg} 1618