pch.c revision 246074
1246074Sgabor/* $FreeBSD: head/usr.bin/patch/pch.c 246074 2013-01-29 17:03:18Z gabor $ */ 2246074Sgabor/*- 3246074Sgabor * 4246074Sgabor * Copyright 1986, Larry Wall 5246074Sgabor * 6246074Sgabor * Redistribution and use in source and binary forms, with or without 7246074Sgabor * modification, are permitted provided that the following condition is met: 8246074Sgabor * 1. Redistributions of source code must retain the above copyright notice, 9246074Sgabor * this condition and the following disclaimer. 10246074Sgabor * 11246074Sgabor * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 12246074Sgabor * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 13246074Sgabor * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 14246074Sgabor * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 15246074Sgabor * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 16246074Sgabor * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 17246074Sgabor * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 18246074Sgabor * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 19246074Sgabor * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 20246074Sgabor * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 21246074Sgabor * SUCH DAMAGE. 22246074Sgabor * 23246074Sgabor * patch - a program to apply diffs to original files 24246074Sgabor * 25246074Sgabor * -C option added in 1998, original code by Marc Espie, based on FreeBSD 26246074Sgabor * behaviour 27246074Sgabor * 28246074Sgabor * $OpenBSD: pch.c,v 1.37 2007/09/02 15:19:33 deraadt Exp $ 29246074Sgabor * $DragonFly: src/usr.bin/patch/pch.c,v 1.6 2008/08/10 23:35:40 joerg Exp $ 30246074Sgabor */ 31246074Sgabor 32246074Sgabor#include <sys/types.h> 33246074Sgabor#include <sys/stat.h> 34246074Sgabor 35246074Sgabor#include <ctype.h> 36246074Sgabor#include <libgen.h> 37246074Sgabor#include <limits.h> 38246074Sgabor#include <stdio.h> 39246074Sgabor#include <stdlib.h> 40246074Sgabor#include <string.h> 41246074Sgabor#include <unistd.h> 42246074Sgabor 43246074Sgabor#include "common.h" 44246074Sgabor#include "util.h" 45246074Sgabor#include "pch.h" 46246074Sgabor#include "pathnames.h" 47246074Sgabor 48246074Sgabor/* Patch (diff listing) abstract type. */ 49246074Sgabor 50246074Sgaborstatic long p_filesize; /* size of the patch file */ 51246074Sgaborstatic LINENUM p_first; /* 1st line number */ 52246074Sgaborstatic LINENUM p_newfirst; /* 1st line number of replacement */ 53246074Sgaborstatic LINENUM p_ptrn_lines; /* # lines in pattern */ 54246074Sgaborstatic LINENUM p_repl_lines; /* # lines in replacement text */ 55246074Sgaborstatic LINENUM p_end = -1; /* last line in hunk */ 56246074Sgaborstatic LINENUM p_max; /* max allowed value of p_end */ 57246074Sgaborstatic LINENUM p_context = 3; /* # of context lines */ 58246074Sgaborstatic LINENUM p_input_line = 0; /* current line # from patch file */ 59246074Sgaborstatic char **p_line = NULL;/* the text of the hunk */ 60246074Sgaborstatic short *p_len = NULL; /* length of each line */ 61246074Sgaborstatic char *p_char = NULL; /* +, -, and ! */ 62246074Sgaborstatic int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ 63246074Sgaborstatic int p_indent; /* indent to patch */ 64246074Sgaborstatic LINENUM p_base; /* where to intuit this time */ 65246074Sgaborstatic LINENUM p_bline; /* line # of p_base */ 66246074Sgaborstatic LINENUM p_start; /* where intuit found a patch */ 67246074Sgaborstatic LINENUM p_sline; /* and the line number for it */ 68246074Sgaborstatic LINENUM p_hunk_beg; /* line number of current hunk */ 69246074Sgaborstatic LINENUM p_efake = -1; /* end of faked up lines--don't free */ 70246074Sgaborstatic LINENUM p_bfake = -1; /* beg of faked up lines */ 71246074Sgaborstatic FILE *pfp = NULL; /* patch file pointer */ 72246074Sgaborstatic char *bestguess = NULL; /* guess at correct filename */ 73246074Sgabor 74246074Sgaborstatic void grow_hunkmax(void); 75246074Sgaborstatic int intuit_diff_type(void); 76246074Sgaborstatic void next_intuit_at(LINENUM, LINENUM); 77246074Sgaborstatic void skip_to(LINENUM, LINENUM); 78246074Sgaborstatic size_t pgets(bool _do_indent); 79246074Sgaborstatic char *best_name(const struct file_name *, bool); 80246074Sgaborstatic char *posix_name(const struct file_name *, bool); 81246074Sgaborstatic size_t num_components(const 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; 105246074Sgabor 106246074Sgabor if (filename == NULL || *filename == '\0' || strEQ(filename, "-")) { 107246074Sgabor pfp = fopen(TMPPATNAME, "w"); 108246074Sgabor if (pfp == NULL) 109246074Sgabor pfatal("can't create %s", TMPPATNAME); 110246074Sgabor while (fgets(buf, buf_size, stdin) != NULL) 111246074Sgabor fputs(buf, pfp); 112246074Sgabor if (ferror(pfp) || fclose(pfp)) 113246074Sgabor pfatal("can't write %s", TMPPATNAME); 114246074Sgabor filename = TMPPATNAME; 115246074Sgabor } 116246074Sgabor pfp = fopen(filename, "r"); 117246074Sgabor if (pfp == NULL) 118246074Sgabor pfatal("patch file %s not found", filename); 119246074Sgabor fstat(fileno(pfp), &filestat); 120246074Sgabor p_filesize = filestat.st_size; 121246074Sgabor next_intuit_at(0L, 1L); /* start at the beginning */ 122246074Sgabor set_hunkmax(); 123246074Sgabor} 124246074Sgabor 125246074Sgabor/* 126246074Sgabor * Make sure our dynamically realloced tables are malloced to begin with. 127246074Sgabor */ 128246074Sgaborvoid 129246074Sgaborset_hunkmax(void) 130246074Sgabor{ 131246074Sgabor if (p_line == NULL) 132246074Sgabor p_line = calloc((size_t) hunkmax, sizeof(char *)); 133246074Sgabor if (p_len == NULL) 134246074Sgabor p_len = calloc((size_t) hunkmax, sizeof(short)); 135246074Sgabor if (p_char == NULL) 136246074Sgabor p_char = calloc((size_t) hunkmax, sizeof(char)); 137246074Sgabor} 138246074Sgabor 139246074Sgabor/* 140246074Sgabor * Enlarge the arrays containing the current hunk of patch. 141246074Sgabor */ 142246074Sgaborstatic void 143246074Sgaborgrow_hunkmax(void) 144246074Sgabor{ 145246074Sgabor int new_hunkmax; 146246074Sgabor char **new_p_line; 147246074Sgabor short *new_p_len; 148246074Sgabor char *new_p_char; 149246074Sgabor 150246074Sgabor new_hunkmax = hunkmax * 2; 151246074Sgabor 152246074Sgabor if (p_line == NULL || p_len == NULL || p_char == NULL) 153246074Sgabor fatal("Internal memory allocation error\n"); 154246074Sgabor 155246074Sgabor new_p_line = realloc(p_line, new_hunkmax * sizeof(char *)); 156246074Sgabor if (new_p_line == NULL) 157246074Sgabor free(p_line); 158246074Sgabor 159246074Sgabor new_p_len = realloc(p_len, new_hunkmax * sizeof(short)); 160246074Sgabor if (new_p_len == NULL) 161246074Sgabor free(p_len); 162246074Sgabor 163246074Sgabor new_p_char = realloc(p_char, new_hunkmax * sizeof(char)); 164246074Sgabor if (new_p_char == NULL) 165246074Sgabor free(p_char); 166246074Sgabor 167246074Sgabor p_char = new_p_char; 168246074Sgabor p_len = new_p_len; 169246074Sgabor p_line = new_p_line; 170246074Sgabor 171246074Sgabor if (p_line != NULL && p_len != NULL && p_char != NULL) { 172246074Sgabor hunkmax = new_hunkmax; 173246074Sgabor return; 174246074Sgabor } 175246074Sgabor 176246074Sgabor if (!using_plan_a) 177246074Sgabor fatal("out of memory\n"); 178246074Sgabor out_of_mem = true; /* whatever is null will be allocated again */ 179246074Sgabor /* from within plan_a(), of all places */ 180246074Sgabor} 181246074Sgabor 182246074Sgabor/* True if the remainder of the patch file contains a diff of some sort. */ 183246074Sgabor 184246074Sgaborbool 185246074Sgaborthere_is_another_patch(void) 186246074Sgabor{ 187246074Sgabor bool exists = false; 188246074Sgabor 189246074Sgabor if (p_base != 0L && p_base >= p_filesize) { 190246074Sgabor if (verbose) 191246074Sgabor say("done\n"); 192246074Sgabor return false; 193246074Sgabor } 194246074Sgabor if (verbose) 195246074Sgabor say("Hmm..."); 196246074Sgabor diff_type = intuit_diff_type(); 197246074Sgabor if (!diff_type) { 198246074Sgabor if (p_base != 0L) { 199246074Sgabor if (verbose) 200246074Sgabor say(" Ignoring the trailing garbage.\ndone\n"); 201246074Sgabor } else 202246074Sgabor say(" I can't seem to find a patch in there anywhere.\n"); 203246074Sgabor return false; 204246074Sgabor } 205246074Sgabor if (verbose) 206246074Sgabor say(" %sooks like %s to me...\n", 207246074Sgabor (p_base == 0L ? "L" : "The next patch l"), 208246074Sgabor diff_type == UNI_DIFF ? "a unified diff" : 209246074Sgabor diff_type == CONTEXT_DIFF ? "a context diff" : 210246074Sgabor diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" : 211246074Sgabor diff_type == NORMAL_DIFF ? "a normal diff" : 212246074Sgabor "an ed script"); 213246074Sgabor if (p_indent && verbose) 214246074Sgabor say("(Patch is indented %d space%s.)\n", p_indent, 215246074Sgabor p_indent == 1 ? "" : "s"); 216246074Sgabor skip_to(p_start, p_sline); 217246074Sgabor while (filearg[0] == NULL) { 218246074Sgabor if (force || batch) { 219246074Sgabor say("No file to patch. Skipping...\n"); 220246074Sgabor filearg[0] = savestr(bestguess); 221246074Sgabor skip_rest_of_patch = true; 222246074Sgabor return true; 223246074Sgabor } 224246074Sgabor ask("File to patch: "); 225246074Sgabor if (*buf != '\n') { 226246074Sgabor free(bestguess); 227246074Sgabor bestguess = savestr(buf); 228246074Sgabor filearg[0] = fetchname(buf, &exists, 0); 229246074Sgabor } 230246074Sgabor if (!exists) { 231246074Sgabor ask("No file found--skip this patch? [n] "); 232246074Sgabor if (*buf != 'y') 233246074Sgabor continue; 234246074Sgabor if (verbose) 235246074Sgabor say("Skipping patch...\n"); 236246074Sgabor free(filearg[0]); 237246074Sgabor filearg[0] = fetchname(bestguess, &exists, 0); 238246074Sgabor skip_rest_of_patch = true; 239246074Sgabor return true; 240246074Sgabor } 241246074Sgabor } 242246074Sgabor return true; 243246074Sgabor} 244246074Sgabor 245246074Sgaborstatic void 246246074Sgaborp4_fetchname(struct file_name *name, char *str) 247246074Sgabor{ 248246074Sgabor char *t, *h; 249246074Sgabor 250246074Sgabor /* Skip leading whitespace. */ 251246074Sgabor while (isspace((unsigned char)*str)) 252246074Sgabor str++; 253246074Sgabor 254246074Sgabor /* Remove the file revision number. */ 255246074Sgabor for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++) 256246074Sgabor if (*t == '#') 257246074Sgabor h = t; 258246074Sgabor if (h != NULL) 259246074Sgabor *h = '\0'; 260246074Sgabor 261246074Sgabor name->path = fetchname(str, &name->exists, strippath); 262246074Sgabor} 263246074Sgabor 264246074Sgabor/* Determine what kind of diff is in the remaining part of the patch file. */ 265246074Sgabor 266246074Sgaborstatic int 267246074Sgaborintuit_diff_type(void) 268246074Sgabor{ 269246074Sgabor long this_line = 0, previous_line; 270246074Sgabor long first_command_line = -1; 271246074Sgabor LINENUM fcl_line = -1; 272246074Sgabor bool last_line_was_command = false, this_is_a_command = false; 273246074Sgabor bool stars_last_line = false, stars_this_line = false; 274246074Sgabor char *s, *t; 275246074Sgabor int indent, retval; 276246074Sgabor struct file_name names[MAX_FILE]; 277246074Sgabor 278246074Sgabor memset(names, 0, sizeof(names)); 279246074Sgabor ok_to_create_file = false; 280246074Sgabor fseek(pfp, p_base, SEEK_SET); 281246074Sgabor p_input_line = p_bline - 1; 282246074Sgabor for (;;) { 283246074Sgabor previous_line = this_line; 284246074Sgabor last_line_was_command = this_is_a_command; 285246074Sgabor stars_last_line = stars_this_line; 286246074Sgabor this_line = ftell(pfp); 287246074Sgabor indent = 0; 288246074Sgabor p_input_line++; 289246074Sgabor if (pgets(false) == 0) { 290246074Sgabor if (first_command_line >= 0L) { 291246074Sgabor /* nothing but deletes!? */ 292246074Sgabor p_start = first_command_line; 293246074Sgabor p_sline = fcl_line; 294246074Sgabor retval = ED_DIFF; 295246074Sgabor goto scan_exit; 296246074Sgabor } else { 297246074Sgabor p_start = this_line; 298246074Sgabor p_sline = p_input_line; 299246074Sgabor retval = 0; 300246074Sgabor goto scan_exit; 301246074Sgabor } 302246074Sgabor } 303246074Sgabor for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) { 304246074Sgabor if (*s == '\t') 305246074Sgabor indent += 8 - (indent % 8); 306246074Sgabor else 307246074Sgabor indent++; 308246074Sgabor } 309246074Sgabor for (t = s; isdigit((unsigned char)*t) || *t == ','; t++) 310246074Sgabor ; 311246074Sgabor this_is_a_command = (isdigit((unsigned char)*s) && 312246074Sgabor (*t == 'd' || *t == 'c' || *t == 'a')); 313246074Sgabor if (first_command_line < 0L && this_is_a_command) { 314246074Sgabor first_command_line = this_line; 315246074Sgabor fcl_line = p_input_line; 316246074Sgabor p_indent = indent; /* assume this for now */ 317246074Sgabor } 318246074Sgabor if (!stars_last_line && strnEQ(s, "*** ", 4)) 319246074Sgabor names[OLD_FILE].path = fetchname(s + 4, 320246074Sgabor &names[OLD_FILE].exists, strippath); 321246074Sgabor else if (strnEQ(s, "--- ", 4)) 322246074Sgabor names[NEW_FILE].path = fetchname(s + 4, 323246074Sgabor &names[NEW_FILE].exists, strippath); 324246074Sgabor else if (strnEQ(s, "+++ ", 4)) 325246074Sgabor /* pretend it is the old name */ 326246074Sgabor names[OLD_FILE].path = fetchname(s + 4, 327246074Sgabor &names[OLD_FILE].exists, strippath); 328246074Sgabor else if (strnEQ(s, "Index:", 6)) 329246074Sgabor names[INDEX_FILE].path = fetchname(s + 6, 330246074Sgabor &names[INDEX_FILE].exists, strippath); 331246074Sgabor else if (strnEQ(s, "Prereq:", 7)) { 332246074Sgabor for (t = s + 7; isspace((unsigned char)*t); t++) 333246074Sgabor ; 334246074Sgabor revision = savestr(t); 335246074Sgabor for (t = revision; *t && !isspace((unsigned char)*t); t++) 336246074Sgabor ; 337246074Sgabor *t = '\0'; 338246074Sgabor if (*revision == '\0') { 339246074Sgabor free(revision); 340246074Sgabor revision = NULL; 341246074Sgabor } 342246074Sgabor } else if (strnEQ(s, "==== ", 5)) { 343246074Sgabor /* Perforce-style diffs. */ 344246074Sgabor if ((t = strstr(s + 5, " - ")) != NULL) 345246074Sgabor p4_fetchname(&names[NEW_FILE], t + 3); 346246074Sgabor p4_fetchname(&names[OLD_FILE], s + 5); 347246074Sgabor } 348246074Sgabor if ((!diff_type || diff_type == ED_DIFF) && 349246074Sgabor first_command_line >= 0L && 350246074Sgabor strEQ(s, ".\n")) { 351246074Sgabor p_indent = indent; 352246074Sgabor p_start = first_command_line; 353246074Sgabor p_sline = fcl_line; 354246074Sgabor retval = ED_DIFF; 355246074Sgabor goto scan_exit; 356246074Sgabor } 357246074Sgabor if ((!diff_type || diff_type == UNI_DIFF) && strnEQ(s, "@@ -", 4)) { 358246074Sgabor if (strnEQ(s + 4, "0,0", 3)) 359246074Sgabor ok_to_create_file = true; 360246074Sgabor p_indent = indent; 361246074Sgabor p_start = this_line; 362246074Sgabor p_sline = p_input_line; 363246074Sgabor retval = UNI_DIFF; 364246074Sgabor goto scan_exit; 365246074Sgabor } 366246074Sgabor stars_this_line = strnEQ(s, "********", 8); 367246074Sgabor if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line && 368246074Sgabor strnEQ(s, "*** ", 4)) { 369246074Sgabor if (atol(s + 4) == 0) 370246074Sgabor ok_to_create_file = true; 371246074Sgabor /* 372246074Sgabor * If this is a new context diff the character just 373246074Sgabor * before the newline is a '*'. 374246074Sgabor */ 375246074Sgabor while (*s != '\n') 376246074Sgabor s++; 377246074Sgabor p_indent = indent; 378246074Sgabor p_start = previous_line; 379246074Sgabor p_sline = p_input_line - 1; 380246074Sgabor retval = (*(s - 1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF); 381246074Sgabor goto scan_exit; 382246074Sgabor } 383246074Sgabor if ((!diff_type || diff_type == NORMAL_DIFF) && 384246074Sgabor last_line_was_command && 385246074Sgabor (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2))) { 386246074Sgabor p_start = previous_line; 387246074Sgabor p_sline = p_input_line - 1; 388246074Sgabor p_indent = indent; 389246074Sgabor retval = NORMAL_DIFF; 390246074Sgabor goto scan_exit; 391246074Sgabor } 392246074Sgabor } 393246074Sgaborscan_exit: 394246074Sgabor if (retval == UNI_DIFF) { 395246074Sgabor /* unswap old and new */ 396246074Sgabor struct file_name tmp = names[OLD_FILE]; 397246074Sgabor names[OLD_FILE] = names[NEW_FILE]; 398246074Sgabor names[NEW_FILE] = tmp; 399246074Sgabor } 400246074Sgabor if (filearg[0] == NULL) { 401246074Sgabor if (posix) 402246074Sgabor filearg[0] = posix_name(names, ok_to_create_file); 403246074Sgabor else { 404246074Sgabor /* Ignore the Index: name for context diffs, like GNU */ 405246074Sgabor if (names[OLD_FILE].path != NULL || 406246074Sgabor names[NEW_FILE].path != NULL) { 407246074Sgabor free(names[INDEX_FILE].path); 408246074Sgabor names[INDEX_FILE].path = NULL; 409246074Sgabor } 410246074Sgabor filearg[0] = best_name(names, ok_to_create_file); 411246074Sgabor } 412246074Sgabor } 413246074Sgabor 414246074Sgabor free(bestguess); 415246074Sgabor bestguess = NULL; 416246074Sgabor if (filearg[0] != NULL) 417246074Sgabor bestguess = savestr(filearg[0]); 418246074Sgabor else if (!ok_to_create_file) { 419246074Sgabor /* 420246074Sgabor * We don't want to create a new file but we need a 421246074Sgabor * filename to set bestguess. Avoid setting filearg[0] 422246074Sgabor * so the file is not created automatically. 423246074Sgabor */ 424246074Sgabor if (posix) 425246074Sgabor bestguess = posix_name(names, true); 426246074Sgabor else 427246074Sgabor bestguess = best_name(names, true); 428246074Sgabor } 429246074Sgabor free(names[OLD_FILE].path); 430246074Sgabor free(names[NEW_FILE].path); 431246074Sgabor free(names[INDEX_FILE].path); 432246074Sgabor return retval; 433246074Sgabor} 434246074Sgabor 435246074Sgabor/* 436246074Sgabor * Remember where this patch ends so we know where to start up again. 437246074Sgabor */ 438246074Sgaborstatic void 439246074Sgabornext_intuit_at(LINENUM file_pos, LINENUM file_line) 440246074Sgabor{ 441246074Sgabor p_base = file_pos; 442246074Sgabor p_bline = file_line; 443246074Sgabor} 444246074Sgabor 445246074Sgabor/* 446246074Sgabor * Basically a verbose fseek() to the actual diff listing. 447246074Sgabor */ 448246074Sgaborstatic void 449246074Sgaborskip_to(LINENUM file_pos, LINENUM file_line) 450246074Sgabor{ 451246074Sgabor size_t len; 452246074Sgabor 453246074Sgabor if (p_base > file_pos) 454246074Sgabor fatal("Internal error: seek %ld>%ld\n", p_base, file_pos); 455246074Sgabor if (verbose && p_base < file_pos) { 456246074Sgabor fseek(pfp, p_base, SEEK_SET); 457246074Sgabor say("The text leading up to this was:\n--------------------------\n"); 458246074Sgabor while (ftell(pfp) < file_pos) { 459246074Sgabor len = pgets(false); 460246074Sgabor if (len == 0) 461246074Sgabor fatal("Unexpected end of file\n"); 462246074Sgabor say("|%s", buf); 463246074Sgabor } 464246074Sgabor say("--------------------------\n"); 465246074Sgabor } else 466246074Sgabor fseek(pfp, file_pos, SEEK_SET); 467246074Sgabor p_input_line = file_line - 1; 468246074Sgabor} 469246074Sgabor 470246074Sgabor/* Make this a function for better debugging. */ 471246074Sgaborstatic void 472246074Sgabormalformed(void) 473246074Sgabor{ 474246074Sgabor fatal("malformed patch at line %ld: %s", p_input_line, buf); 475246074Sgabor /* about as informative as "Syntax error" in C */ 476246074Sgabor} 477246074Sgabor 478246074Sgabor/* 479246074Sgabor * True if the line has been discarded (i.e. it is a line saying 480246074Sgabor * "\ No newline at end of file".) 481246074Sgabor */ 482246074Sgaborstatic bool 483246074Sgaborremove_special_line(void) 484246074Sgabor{ 485246074Sgabor int c; 486246074Sgabor 487246074Sgabor c = fgetc(pfp); 488246074Sgabor if (c == '\\') { 489246074Sgabor do { 490246074Sgabor c = fgetc(pfp); 491246074Sgabor } while (c != EOF && c != '\n'); 492246074Sgabor 493246074Sgabor return true; 494246074Sgabor } 495246074Sgabor if (c != EOF) 496246074Sgabor fseek(pfp, -1L, SEEK_CUR); 497246074Sgabor 498246074Sgabor return false; 499246074Sgabor} 500246074Sgabor 501246074Sgabor/* 502246074Sgabor * True if there is more of the current diff listing to process. 503246074Sgabor */ 504246074Sgaborbool 505246074Sgaboranother_hunk(void) 506246074Sgabor{ 507246074Sgabor long line_beginning; /* file pos of the current line */ 508246074Sgabor LINENUM repl_beginning; /* index of --- line */ 509246074Sgabor LINENUM fillcnt; /* #lines of missing ptrn or repl */ 510246074Sgabor LINENUM fillsrc; /* index of first line to copy */ 511246074Sgabor LINENUM filldst; /* index of first missing line */ 512246074Sgabor bool ptrn_spaces_eaten; /* ptrn was slightly misformed */ 513246074Sgabor bool repl_could_be_missing; /* no + or ! lines in this hunk */ 514246074Sgabor bool repl_missing; /* we are now backtracking */ 515246074Sgabor long repl_backtrack_position; /* file pos of first repl line */ 516246074Sgabor LINENUM repl_patch_line; /* input line number for same */ 517246074Sgabor LINENUM ptrn_copiable; /* # of copiable lines in ptrn */ 518246074Sgabor char *s; 519246074Sgabor size_t len; 520246074Sgabor int context = 0; 521246074Sgabor 522246074Sgabor while (p_end >= 0) { 523246074Sgabor if (p_end == p_efake) 524246074Sgabor p_end = p_bfake; /* don't free twice */ 525246074Sgabor else 526246074Sgabor free(p_line[p_end]); 527246074Sgabor p_end--; 528246074Sgabor } 529246074Sgabor p_efake = -1; 530246074Sgabor 531246074Sgabor p_max = hunkmax; /* gets reduced when --- found */ 532246074Sgabor if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) { 533246074Sgabor line_beginning = ftell(pfp); 534246074Sgabor repl_beginning = 0; 535246074Sgabor fillcnt = 0; 536246074Sgabor fillsrc = 0; 537246074Sgabor filldst = 0; 538246074Sgabor ptrn_spaces_eaten = false; 539246074Sgabor repl_could_be_missing = true; 540246074Sgabor repl_missing = false; 541246074Sgabor repl_backtrack_position = 0; 542246074Sgabor repl_patch_line = 0; 543246074Sgabor ptrn_copiable = 0; 544246074Sgabor 545246074Sgabor len = pgets(true); 546246074Sgabor p_input_line++; 547246074Sgabor if (len == 0 || strnNE(buf, "********", 8)) { 548246074Sgabor next_intuit_at(line_beginning, p_input_line); 549246074Sgabor return false; 550246074Sgabor } 551246074Sgabor p_context = 100; 552246074Sgabor p_hunk_beg = p_input_line + 1; 553246074Sgabor while (p_end < p_max) { 554246074Sgabor line_beginning = ftell(pfp); 555246074Sgabor len = pgets(true); 556246074Sgabor p_input_line++; 557246074Sgabor if (len == 0) { 558246074Sgabor if (p_max - p_end < 4) { 559246074Sgabor /* assume blank lines got chopped */ 560246074Sgabor strlcpy(buf, " \n", buf_size); 561246074Sgabor } else { 562246074Sgabor if (repl_beginning && repl_could_be_missing) { 563246074Sgabor repl_missing = true; 564246074Sgabor goto hunk_done; 565246074Sgabor } 566246074Sgabor fatal("unexpected end of file in patch\n"); 567246074Sgabor } 568246074Sgabor } 569246074Sgabor p_end++; 570246074Sgabor if (p_end >= hunkmax) 571246074Sgabor fatal("Internal error: hunk larger than hunk " 572246074Sgabor "buffer size"); 573246074Sgabor p_char[p_end] = *buf; 574246074Sgabor p_line[p_end] = NULL; 575246074Sgabor switch (*buf) { 576246074Sgabor case '*': 577246074Sgabor if (strnEQ(buf, "********", 8)) { 578246074Sgabor if (repl_beginning && repl_could_be_missing) { 579246074Sgabor repl_missing = true; 580246074Sgabor goto hunk_done; 581246074Sgabor } else 582246074Sgabor fatal("unexpected end of hunk " 583246074Sgabor "at line %ld\n", 584246074Sgabor p_input_line); 585246074Sgabor } 586246074Sgabor if (p_end != 0) { 587246074Sgabor if (repl_beginning && repl_could_be_missing) { 588246074Sgabor repl_missing = true; 589246074Sgabor goto hunk_done; 590246074Sgabor } 591246074Sgabor fatal("unexpected *** at line %ld: %s", 592246074Sgabor p_input_line, buf); 593246074Sgabor } 594246074Sgabor context = 0; 595246074Sgabor p_line[p_end] = savestr(buf); 596246074Sgabor if (out_of_mem) { 597246074Sgabor p_end--; 598246074Sgabor return false; 599246074Sgabor } 600246074Sgabor for (s = buf; *s && !isdigit((unsigned char)*s); s++) 601246074Sgabor ; 602246074Sgabor if (!*s) 603246074Sgabor malformed(); 604246074Sgabor if (strnEQ(s, "0,0", 3)) 605246074Sgabor memmove(s, s + 2, strlen(s + 2) + 1); 606246074Sgabor p_first = (LINENUM) atol(s); 607246074Sgabor while (isdigit((unsigned char)*s)) 608246074Sgabor s++; 609246074Sgabor if (*s == ',') { 610246074Sgabor for (; *s && !isdigit((unsigned char)*s); s++) 611246074Sgabor ; 612246074Sgabor if (!*s) 613246074Sgabor malformed(); 614246074Sgabor p_ptrn_lines = ((LINENUM) atol(s)) - p_first + 1; 615246074Sgabor } else if (p_first) 616246074Sgabor p_ptrn_lines = 1; 617246074Sgabor else { 618246074Sgabor p_ptrn_lines = 0; 619246074Sgabor p_first = 1; 620246074Sgabor } 621246074Sgabor 622246074Sgabor /* we need this much at least */ 623246074Sgabor p_max = p_ptrn_lines + 6; 624246074Sgabor while (p_max >= hunkmax) 625246074Sgabor grow_hunkmax(); 626246074Sgabor p_max = hunkmax; 627246074Sgabor break; 628246074Sgabor case '-': 629246074Sgabor if (buf[1] == '-') { 630246074Sgabor if (repl_beginning || 631246074Sgabor (p_end != p_ptrn_lines + 1 + 632246074Sgabor (p_char[p_end - 1] == '\n'))) { 633246074Sgabor if (p_end == 1) { 634246074Sgabor /* 635246074Sgabor * `old' lines were omitted; 636246074Sgabor * set up to fill them in 637246074Sgabor * from 'new' context lines. 638246074Sgabor */ 639246074Sgabor p_end = p_ptrn_lines + 1; 640246074Sgabor fillsrc = p_end + 1; 641246074Sgabor filldst = 1; 642246074Sgabor fillcnt = p_ptrn_lines; 643246074Sgabor } else { 644246074Sgabor if (repl_beginning) { 645246074Sgabor if (repl_could_be_missing) { 646246074Sgabor repl_missing = true; 647246074Sgabor goto hunk_done; 648246074Sgabor } 649246074Sgabor fatal("duplicate \"---\" at line %ld--check line numbers at line %ld\n", 650246074Sgabor p_input_line, p_hunk_beg + repl_beginning); 651246074Sgabor } else { 652246074Sgabor fatal("%s \"---\" at line %ld--check line numbers at line %ld\n", 653246074Sgabor (p_end <= p_ptrn_lines 654246074Sgabor ? "Premature" 655246074Sgabor : "Overdue"), 656246074Sgabor p_input_line, p_hunk_beg); 657246074Sgabor } 658246074Sgabor } 659246074Sgabor } 660246074Sgabor repl_beginning = p_end; 661246074Sgabor repl_backtrack_position = ftell(pfp); 662246074Sgabor repl_patch_line = p_input_line; 663246074Sgabor p_line[p_end] = savestr(buf); 664246074Sgabor if (out_of_mem) { 665246074Sgabor p_end--; 666246074Sgabor return false; 667246074Sgabor } 668246074Sgabor p_char[p_end] = '='; 669246074Sgabor for (s = buf; *s && !isdigit((unsigned char)*s); s++) 670246074Sgabor ; 671246074Sgabor if (!*s) 672246074Sgabor malformed(); 673246074Sgabor p_newfirst = (LINENUM) atol(s); 674246074Sgabor while (isdigit((unsigned char)*s)) 675246074Sgabor s++; 676246074Sgabor if (*s == ',') { 677246074Sgabor for (; *s && !isdigit((unsigned char)*s); s++) 678246074Sgabor ; 679246074Sgabor if (!*s) 680246074Sgabor malformed(); 681246074Sgabor p_repl_lines = ((LINENUM) atol(s)) - 682246074Sgabor p_newfirst + 1; 683246074Sgabor } else if (p_newfirst) 684246074Sgabor p_repl_lines = 1; 685246074Sgabor else { 686246074Sgabor p_repl_lines = 0; 687246074Sgabor p_newfirst = 1; 688246074Sgabor } 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); 707246074Sgabor if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && 708246074Sgabor 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]); 793246074Sgabor fseek(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 871246074Sgabor line_beginning = ftell(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(); 881246074Sgabor p_first = (LINENUM) atol(s); 882246074Sgabor while (isdigit((unsigned char)*s)) 883246074Sgabor s++; 884246074Sgabor if (*s == ',') { 885246074Sgabor p_ptrn_lines = (LINENUM) atol(++s); 886246074Sgabor while (isdigit((unsigned char)*s)) 887246074Sgabor s++; 888246074Sgabor } else 889246074Sgabor p_ptrn_lines = 1; 890246074Sgabor if (*s == ' ') 891246074Sgabor s++; 892246074Sgabor if (*s != '+' || !*++s) 893246074Sgabor malformed(); 894246074Sgabor p_newfirst = (LINENUM) atol(s); 895246074Sgabor while (isdigit((unsigned char)*s)) 896246074Sgabor s++; 897246074Sgabor if (*s == ',') { 898246074Sgabor p_repl_lines = (LINENUM) atol(++s); 899246074Sgabor while (isdigit((unsigned char)*s)) 900246074Sgabor s++; 901246074Sgabor } else 902246074Sgabor p_repl_lines = 1; 903246074Sgabor if (*s == ' ') 904246074Sgabor s++; 905246074Sgabor if (*s != '@') 906246074Sgabor malformed(); 907246074Sgabor if (!p_ptrn_lines) 908246074Sgabor p_first++; /* do append rather than insert */ 909246074Sgabor p_max = p_ptrn_lines + p_repl_lines + 1; 910246074Sgabor while (p_max >= hunkmax) 911246074Sgabor grow_hunkmax(); 912246074Sgabor fillold = 1; 913246074Sgabor fillnew = fillold + p_ptrn_lines; 914246074Sgabor p_end = fillnew + p_repl_lines; 915246074Sgabor snprintf(buf, buf_size, "*** %ld,%ld ****\n", p_first, 916246074Sgabor p_first + p_ptrn_lines - 1); 917246074Sgabor p_line[0] = savestr(buf); 918246074Sgabor if (out_of_mem) { 919246074Sgabor p_end = -1; 920246074Sgabor return false; 921246074Sgabor } 922246074Sgabor p_char[0] = '*'; 923246074Sgabor snprintf(buf, buf_size, "--- %ld,%ld ----\n", p_newfirst, 924246074Sgabor p_newfirst + p_repl_lines - 1); 925246074Sgabor p_line[fillnew] = savestr(buf); 926246074Sgabor if (out_of_mem) { 927246074Sgabor p_end = 0; 928246074Sgabor return false; 929246074Sgabor } 930246074Sgabor p_char[fillnew++] = '='; 931246074Sgabor p_context = 100; 932246074Sgabor context = 0; 933246074Sgabor p_hunk_beg = p_input_line + 1; 934246074Sgabor while (fillold <= p_ptrn_lines || fillnew <= p_end) { 935246074Sgabor line_beginning = ftell(pfp); 936246074Sgabor len = pgets(true); 937246074Sgabor p_input_line++; 938246074Sgabor if (len == 0) { 939246074Sgabor if (p_max - fillnew < 3) { 940246074Sgabor /* assume blank lines got chopped */ 941246074Sgabor strlcpy(buf, " \n", buf_size); 942246074Sgabor } else { 943246074Sgabor fatal("unexpected end of file in patch\n"); 944246074Sgabor } 945246074Sgabor } 946246074Sgabor if (*buf == '\t' || *buf == '\n') { 947246074Sgabor ch = ' '; /* assume the space got eaten */ 948246074Sgabor s = savestr(buf); 949246074Sgabor } else { 950246074Sgabor ch = *buf; 951246074Sgabor s = savestr(buf + 1); 952246074Sgabor } 953246074Sgabor if (out_of_mem) { 954246074Sgabor while (--fillnew > p_ptrn_lines) 955246074Sgabor free(p_line[fillnew]); 956246074Sgabor p_end = fillold - 1; 957246074Sgabor return false; 958246074Sgabor } 959246074Sgabor switch (ch) { 960246074Sgabor case '-': 961246074Sgabor if (fillold > p_ptrn_lines) { 962246074Sgabor free(s); 963246074Sgabor p_end = fillnew - 1; 964246074Sgabor malformed(); 965246074Sgabor } 966246074Sgabor p_char[fillold] = ch; 967246074Sgabor p_line[fillold] = s; 968246074Sgabor p_len[fillold++] = strlen(s); 969246074Sgabor if (fillold > p_ptrn_lines) { 970246074Sgabor if (remove_special_line()) { 971246074Sgabor p_len[fillold - 1] -= 1; 972246074Sgabor s[p_len[fillold - 1]] = 0; 973246074Sgabor } 974246074Sgabor } 975246074Sgabor break; 976246074Sgabor case '=': 977246074Sgabor ch = ' '; 978246074Sgabor /* FALL THROUGH */ 979246074Sgabor case ' ': 980246074Sgabor if (fillold > p_ptrn_lines) { 981246074Sgabor free(s); 982246074Sgabor while (--fillnew > p_ptrn_lines) 983246074Sgabor free(p_line[fillnew]); 984246074Sgabor p_end = fillold - 1; 985246074Sgabor malformed(); 986246074Sgabor } 987246074Sgabor context++; 988246074Sgabor p_char[fillold] = ch; 989246074Sgabor p_line[fillold] = s; 990246074Sgabor p_len[fillold++] = strlen(s); 991246074Sgabor s = savestr(s); 992246074Sgabor if (out_of_mem) { 993246074Sgabor while (--fillnew > p_ptrn_lines) 994246074Sgabor free(p_line[fillnew]); 995246074Sgabor p_end = fillold - 1; 996246074Sgabor return false; 997246074Sgabor } 998246074Sgabor if (fillold > p_ptrn_lines) { 999246074Sgabor if (remove_special_line()) { 1000246074Sgabor p_len[fillold - 1] -= 1; 1001246074Sgabor s[p_len[fillold - 1]] = 0; 1002246074Sgabor } 1003246074Sgabor } 1004246074Sgabor /* FALL THROUGH */ 1005246074Sgabor case '+': 1006246074Sgabor if (fillnew > p_end) { 1007246074Sgabor free(s); 1008246074Sgabor while (--fillnew > p_ptrn_lines) 1009246074Sgabor free(p_line[fillnew]); 1010246074Sgabor p_end = fillold - 1; 1011246074Sgabor malformed(); 1012246074Sgabor } 1013246074Sgabor p_char[fillnew] = ch; 1014246074Sgabor p_line[fillnew] = s; 1015246074Sgabor p_len[fillnew++] = strlen(s); 1016246074Sgabor if (fillold > p_ptrn_lines) { 1017246074Sgabor if (remove_special_line()) { 1018246074Sgabor p_len[fillnew - 1] -= 1; 1019246074Sgabor s[p_len[fillnew - 1]] = 0; 1020246074Sgabor } 1021246074Sgabor } 1022246074Sgabor break; 1023246074Sgabor default: 1024246074Sgabor p_end = fillnew; 1025246074Sgabor malformed(); 1026246074Sgabor } 1027246074Sgabor if (ch != ' ' && context > 0) { 1028246074Sgabor if (context < p_context) 1029246074Sgabor p_context = context; 1030246074Sgabor context = -1000; 1031246074Sgabor } 1032246074Sgabor } /* while */ 1033246074Sgabor } else { /* normal diff--fake it up */ 1034246074Sgabor char hunk_type; 1035246074Sgabor int i; 1036246074Sgabor LINENUM min, max; 1037246074Sgabor 1038246074Sgabor line_beginning = ftell(pfp); 1039246074Sgabor p_context = 0; 1040246074Sgabor len = pgets(true); 1041246074Sgabor p_input_line++; 1042246074Sgabor if (len == 0 || !isdigit((unsigned char)*buf)) { 1043246074Sgabor next_intuit_at(line_beginning, p_input_line); 1044246074Sgabor return false; 1045246074Sgabor } 1046246074Sgabor p_first = (LINENUM) atol(buf); 1047246074Sgabor for (s = buf; isdigit((unsigned char)*s); s++) 1048246074Sgabor ; 1049246074Sgabor if (*s == ',') { 1050246074Sgabor p_ptrn_lines = (LINENUM) atol(++s) - p_first + 1; 1051246074Sgabor while (isdigit((unsigned char)*s)) 1052246074Sgabor s++; 1053246074Sgabor } else 1054246074Sgabor p_ptrn_lines = (*s != 'a'); 1055246074Sgabor hunk_type = *s; 1056246074Sgabor if (hunk_type == 'a') 1057246074Sgabor p_first++; /* do append rather than insert */ 1058246074Sgabor min = (LINENUM) atol(++s); 1059246074Sgabor for (; isdigit((unsigned char)*s); s++) 1060246074Sgabor ; 1061246074Sgabor if (*s == ',') 1062246074Sgabor max = (LINENUM) atol(++s); 1063246074Sgabor else 1064246074Sgabor max = min; 1065246074Sgabor if (hunk_type == 'd') 1066246074Sgabor min++; 1067246074Sgabor p_end = p_ptrn_lines + 1 + max - min + 1; 1068246074Sgabor if (p_end > MAXHUNKSIZE) 1069246074Sgabor fatal("hunk too large (%ld lines) at line %ld: %s", 1070246074Sgabor p_end, p_input_line, buf); 1071246074Sgabor while (p_end >= hunkmax) 1072246074Sgabor grow_hunkmax(); 1073246074Sgabor p_newfirst = min; 1074246074Sgabor p_repl_lines = max - min + 1; 1075246074Sgabor snprintf(buf, buf_size, "*** %ld,%ld\n", p_first, 1076246074Sgabor p_first + p_ptrn_lines - 1); 1077246074Sgabor p_line[0] = savestr(buf); 1078246074Sgabor if (out_of_mem) { 1079246074Sgabor p_end = -1; 1080246074Sgabor return false; 1081246074Sgabor } 1082246074Sgabor p_char[0] = '*'; 1083246074Sgabor for (i = 1; i <= p_ptrn_lines; i++) { 1084246074Sgabor len = pgets(true); 1085246074Sgabor p_input_line++; 1086246074Sgabor if (len == 0) 1087246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1088246074Sgabor p_input_line); 1089246074Sgabor if (*buf != '<') 1090246074Sgabor fatal("< expected at line %ld of patch\n", 1091246074Sgabor p_input_line); 1092246074Sgabor p_line[i] = savestr(buf + 2); 1093246074Sgabor if (out_of_mem) { 1094246074Sgabor p_end = i - 1; 1095246074Sgabor return false; 1096246074Sgabor } 1097246074Sgabor p_len[i] = strlen(p_line[i]); 1098246074Sgabor p_char[i] = '-'; 1099246074Sgabor } 1100246074Sgabor 1101246074Sgabor if (remove_special_line()) { 1102246074Sgabor p_len[i - 1] -= 1; 1103246074Sgabor (p_line[i - 1])[p_len[i - 1]] = 0; 1104246074Sgabor } 1105246074Sgabor if (hunk_type == 'c') { 1106246074Sgabor len = pgets(true); 1107246074Sgabor p_input_line++; 1108246074Sgabor if (len == 0) 1109246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1110246074Sgabor p_input_line); 1111246074Sgabor if (*buf != '-') 1112246074Sgabor fatal("--- expected at line %ld of patch\n", 1113246074Sgabor p_input_line); 1114246074Sgabor } 1115246074Sgabor snprintf(buf, buf_size, "--- %ld,%ld\n", min, max); 1116246074Sgabor p_line[i] = savestr(buf); 1117246074Sgabor if (out_of_mem) { 1118246074Sgabor p_end = i - 1; 1119246074Sgabor return false; 1120246074Sgabor } 1121246074Sgabor p_char[i] = '='; 1122246074Sgabor for (i++; i <= p_end; i++) { 1123246074Sgabor len = pgets(true); 1124246074Sgabor p_input_line++; 1125246074Sgabor if (len == 0) 1126246074Sgabor fatal("unexpected end of file in patch at line %ld\n", 1127246074Sgabor p_input_line); 1128246074Sgabor if (*buf != '>') 1129246074Sgabor fatal("> expected at line %ld of patch\n", 1130246074Sgabor p_input_line); 1131246074Sgabor p_line[i] = savestr(buf + 2); 1132246074Sgabor if (out_of_mem) { 1133246074Sgabor p_end = i - 1; 1134246074Sgabor return false; 1135246074Sgabor } 1136246074Sgabor p_len[i] = strlen(p_line[i]); 1137246074Sgabor p_char[i] = '+'; 1138246074Sgabor } 1139246074Sgabor 1140246074Sgabor if (remove_special_line()) { 1141246074Sgabor p_len[i - 1] -= 1; 1142246074Sgabor (p_line[i - 1])[p_len[i - 1]] = 0; 1143246074Sgabor } 1144246074Sgabor } 1145246074Sgabor if (reverse) /* backwards patch? */ 1146246074Sgabor if (!pch_swap()) 1147246074Sgabor say("Not enough memory to swap next hunk!\n"); 1148246074Sgabor#ifdef DEBUGGING 1149246074Sgabor if (debug & 2) { 1150246074Sgabor int i; 1151246074Sgabor char special; 1152246074Sgabor 1153246074Sgabor for (i = 0; i <= p_end; i++) { 1154246074Sgabor if (i == p_ptrn_lines) 1155246074Sgabor special = '^'; 1156246074Sgabor else 1157246074Sgabor special = ' '; 1158246074Sgabor fprintf(stderr, "%3d %c %c %s", i, p_char[i], 1159246074Sgabor special, p_line[i]); 1160246074Sgabor fflush(stderr); 1161246074Sgabor } 1162246074Sgabor } 1163246074Sgabor#endif 1164246074Sgabor if (p_end + 1 < hunkmax)/* paranoia reigns supreme... */ 1165246074Sgabor p_char[p_end + 1] = '^'; /* add a stopper for apply_hunk */ 1166246074Sgabor return true; 1167246074Sgabor} 1168246074Sgabor 1169246074Sgabor/* 1170246074Sgabor * Input a line from the patch file. 1171246074Sgabor * Worry about indentation if do_indent is true. 1172246074Sgabor * The line is read directly into the buf global variable which 1173246074Sgabor * is resized if necessary in order to hold the complete line. 1174246074Sgabor * Returns the number of characters read including the terminating 1175246074Sgabor * '\n', if any. 1176246074Sgabor */ 1177246074Sgaborsize_t 1178246074Sgaborpgets(bool do_indent) 1179246074Sgabor{ 1180246074Sgabor char *line; 1181246074Sgabor size_t len; 1182246074Sgabor int indent = 0, skipped = 0; 1183246074Sgabor 1184246074Sgabor line = fgetln(pfp, &len); 1185246074Sgabor if (line != NULL) { 1186246074Sgabor if (len + 1 > buf_size) { 1187246074Sgabor while (len + 1 > buf_size) 1188246074Sgabor buf_size *= 2; 1189246074Sgabor free(buf); 1190246074Sgabor buf = malloc(buf_size); 1191246074Sgabor if (buf == NULL) 1192246074Sgabor fatal("out of memory\n"); 1193246074Sgabor } 1194246074Sgabor if (do_indent == 1 && p_indent) { 1195246074Sgabor for (; 1196246074Sgabor indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X'); 1197246074Sgabor line++, skipped++) { 1198246074Sgabor if (*line == '\t') 1199246074Sgabor indent += 8 - (indent %7); 1200246074Sgabor else 1201246074Sgabor indent++; 1202246074Sgabor } 1203246074Sgabor } 1204246074Sgabor strncpy(buf, line, len - skipped); 1205246074Sgabor buf[len - skipped] = '\0'; 1206246074Sgabor } 1207246074Sgabor return len; 1208246074Sgabor} 1209246074Sgabor 1210246074Sgabor 1211246074Sgabor/* 1212246074Sgabor * Reverse the old and new portions of the current hunk. 1213246074Sgabor */ 1214246074Sgaborbool 1215246074Sgaborpch_swap(void) 1216246074Sgabor{ 1217246074Sgabor char **tp_line; /* the text of the hunk */ 1218246074Sgabor short *tp_len; /* length of each line */ 1219246074Sgabor char *tp_char; /* +, -, and ! */ 1220246074Sgabor LINENUM i; 1221246074Sgabor LINENUM n; 1222246074Sgabor bool blankline = false; 1223246074Sgabor char *s; 1224246074Sgabor 1225246074Sgabor i = p_first; 1226246074Sgabor p_first = p_newfirst; 1227246074Sgabor p_newfirst = i; 1228246074Sgabor 1229246074Sgabor /* make a scratch copy */ 1230246074Sgabor 1231246074Sgabor tp_line = p_line; 1232246074Sgabor tp_len = p_len; 1233246074Sgabor tp_char = p_char; 1234246074Sgabor p_line = NULL; /* force set_hunkmax to allocate again */ 1235246074Sgabor p_len = NULL; 1236246074Sgabor p_char = NULL; 1237246074Sgabor set_hunkmax(); 1238246074Sgabor if (p_line == NULL || p_len == NULL || p_char == NULL) { 1239246074Sgabor 1240246074Sgabor free(p_line); 1241246074Sgabor p_line = tp_line; 1242246074Sgabor free(p_len); 1243246074Sgabor p_len = tp_len; 1244246074Sgabor free(p_char); 1245246074Sgabor p_char = tp_char; 1246246074Sgabor return false; /* not enough memory to swap hunk! */ 1247246074Sgabor } 1248246074Sgabor /* now turn the new into the old */ 1249246074Sgabor 1250246074Sgabor i = p_ptrn_lines + 1; 1251246074Sgabor if (tp_char[i] == '\n') { /* account for possible blank line */ 1252246074Sgabor blankline = true; 1253246074Sgabor i++; 1254246074Sgabor } 1255246074Sgabor if (p_efake >= 0) { /* fix non-freeable ptr range */ 1256246074Sgabor if (p_efake <= i) 1257246074Sgabor n = p_end - i + 1; 1258246074Sgabor else 1259246074Sgabor n = -i; 1260246074Sgabor p_efake += n; 1261246074Sgabor p_bfake += n; 1262246074Sgabor } 1263246074Sgabor for (n = 0; i <= p_end; i++, n++) { 1264246074Sgabor p_line[n] = tp_line[i]; 1265246074Sgabor p_char[n] = tp_char[i]; 1266246074Sgabor if (p_char[n] == '+') 1267246074Sgabor p_char[n] = '-'; 1268246074Sgabor p_len[n] = tp_len[i]; 1269246074Sgabor } 1270246074Sgabor if (blankline) { 1271246074Sgabor i = p_ptrn_lines + 1; 1272246074Sgabor p_line[n] = tp_line[i]; 1273246074Sgabor p_char[n] = tp_char[i]; 1274246074Sgabor p_len[n] = tp_len[i]; 1275246074Sgabor n++; 1276246074Sgabor } 1277246074Sgabor if (p_char[0] != '=') 1278246074Sgabor fatal("Malformed patch at line %ld: expected '=' found '%c'\n", 1279246074Sgabor p_input_line, p_char[0]); 1280246074Sgabor p_char[0] = '*'; 1281246074Sgabor for (s = p_line[0]; *s; s++) 1282246074Sgabor if (*s == '-') 1283246074Sgabor *s = '*'; 1284246074Sgabor 1285246074Sgabor /* now turn the old into the new */ 1286246074Sgabor 1287246074Sgabor if (p_char[0] != '*') 1288246074Sgabor fatal("Malformed patch at line %ld: expected '*' found '%c'\n", 1289246074Sgabor p_input_line, p_char[0]); 1290246074Sgabor tp_char[0] = '='; 1291246074Sgabor for (s = tp_line[0]; *s; s++) 1292246074Sgabor if (*s == '*') 1293246074Sgabor *s = '-'; 1294246074Sgabor for (i = 0; n <= p_end; i++, n++) { 1295246074Sgabor p_line[n] = tp_line[i]; 1296246074Sgabor p_char[n] = tp_char[i]; 1297246074Sgabor if (p_char[n] == '-') 1298246074Sgabor p_char[n] = '+'; 1299246074Sgabor p_len[n] = tp_len[i]; 1300246074Sgabor } 1301246074Sgabor 1302246074Sgabor if (i != p_ptrn_lines + 1) 1303246074Sgabor fatal("Malformed patch at line %ld: expected %ld lines, " 1304246074Sgabor "got %ld\n", 1305246074Sgabor p_input_line, p_ptrn_lines + 1, i); 1306246074Sgabor 1307246074Sgabor i = p_ptrn_lines; 1308246074Sgabor p_ptrn_lines = p_repl_lines; 1309246074Sgabor p_repl_lines = i; 1310246074Sgabor 1311246074Sgabor free(tp_line); 1312246074Sgabor free(tp_len); 1313246074Sgabor free(tp_char); 1314246074Sgabor 1315246074Sgabor return true; 1316246074Sgabor} 1317246074Sgabor 1318246074Sgabor/* 1319246074Sgabor * Return the specified line position in the old file of the old context. 1320246074Sgabor */ 1321246074SgaborLINENUM 1322246074Sgaborpch_first(void) 1323246074Sgabor{ 1324246074Sgabor return p_first; 1325246074Sgabor} 1326246074Sgabor 1327246074Sgabor/* 1328246074Sgabor * Return the number of lines of old context. 1329246074Sgabor */ 1330246074SgaborLINENUM 1331246074Sgaborpch_ptrn_lines(void) 1332246074Sgabor{ 1333246074Sgabor return p_ptrn_lines; 1334246074Sgabor} 1335246074Sgabor 1336246074Sgabor/* 1337246074Sgabor * Return the probable line position in the new file of the first line. 1338246074Sgabor */ 1339246074SgaborLINENUM 1340246074Sgaborpch_newfirst(void) 1341246074Sgabor{ 1342246074Sgabor return p_newfirst; 1343246074Sgabor} 1344246074Sgabor 1345246074Sgabor/* 1346246074Sgabor * Return the number of lines in the replacement text including context. 1347246074Sgabor */ 1348246074SgaborLINENUM 1349246074Sgaborpch_repl_lines(void) 1350246074Sgabor{ 1351246074Sgabor return p_repl_lines; 1352246074Sgabor} 1353246074Sgabor 1354246074Sgabor/* 1355246074Sgabor * Return the number of lines in the whole hunk. 1356246074Sgabor */ 1357246074SgaborLINENUM 1358246074Sgaborpch_end(void) 1359246074Sgabor{ 1360246074Sgabor return p_end; 1361246074Sgabor} 1362246074Sgabor 1363246074Sgabor/* 1364246074Sgabor * Return the number of context lines before the first changed line. 1365246074Sgabor */ 1366246074SgaborLINENUM 1367246074Sgaborpch_context(void) 1368246074Sgabor{ 1369246074Sgabor return p_context; 1370246074Sgabor} 1371246074Sgabor 1372246074Sgabor/* 1373246074Sgabor * Return the length of a particular patch line. 1374246074Sgabor */ 1375246074Sgaborshort 1376246074Sgaborpch_line_len(LINENUM line) 1377246074Sgabor{ 1378246074Sgabor return p_len[line]; 1379246074Sgabor} 1380246074Sgabor 1381246074Sgabor/* 1382246074Sgabor * Return the control character (+, -, *, !, etc) for a patch line. 1383246074Sgabor */ 1384246074Sgaborchar 1385246074Sgaborpch_char(LINENUM line) 1386246074Sgabor{ 1387246074Sgabor return p_char[line]; 1388246074Sgabor} 1389246074Sgabor 1390246074Sgabor/* 1391246074Sgabor * Return a pointer to a particular patch line. 1392246074Sgabor */ 1393246074Sgaborchar * 1394246074Sgaborpfetch(LINENUM line) 1395246074Sgabor{ 1396246074Sgabor return p_line[line]; 1397246074Sgabor} 1398246074Sgabor 1399246074Sgabor/* 1400246074Sgabor * Return where in the patch file this hunk began, for error messages. 1401246074Sgabor */ 1402246074SgaborLINENUM 1403246074Sgaborpch_hunk_beg(void) 1404246074Sgabor{ 1405246074Sgabor return p_hunk_beg; 1406246074Sgabor} 1407246074Sgabor 1408246074Sgabor/* 1409246074Sgabor * Apply an ed script by feeding ed itself. 1410246074Sgabor */ 1411246074Sgaborvoid 1412246074Sgabordo_ed_script(void) 1413246074Sgabor{ 1414246074Sgabor char *t; 1415246074Sgabor long beginning_of_this_line; 1416246074Sgabor FILE *pipefp = NULL; 1417246074Sgabor 1418246074Sgabor if (!skip_rest_of_patch) { 1419246074Sgabor if (copy_file(filearg[0], TMPOUTNAME) < 0) { 1420246074Sgabor unlink(TMPOUTNAME); 1421246074Sgabor fatal("can't create temp file %s", TMPOUTNAME); 1422246074Sgabor } 1423246074Sgabor snprintf(buf, buf_size, "%s%s%s", _PATH_ED, 1424246074Sgabor verbose ? " " : " -s ", TMPOUTNAME); 1425246074Sgabor pipefp = popen(buf, "w"); 1426246074Sgabor } 1427246074Sgabor for (;;) { 1428246074Sgabor beginning_of_this_line = ftell(pfp); 1429246074Sgabor if (pgets(true) == 0) { 1430246074Sgabor next_intuit_at(beginning_of_this_line, p_input_line); 1431246074Sgabor break; 1432246074Sgabor } 1433246074Sgabor p_input_line++; 1434246074Sgabor for (t = buf; isdigit((unsigned char)*t) || *t == ','; t++) 1435246074Sgabor ; 1436246074Sgabor /* POSIX defines allowed commands as {a,c,d,i,s} */ 1437246074Sgabor if (isdigit((unsigned char)*buf) && (*t == 'a' || *t == 'c' || 1438246074Sgabor *t == 'd' || *t == 'i' || *t == 's')) { 1439246074Sgabor if (pipefp != NULL) 1440246074Sgabor fputs(buf, pipefp); 1441246074Sgabor if (*t != 'd') { 1442246074Sgabor while (pgets(true)) { 1443246074Sgabor p_input_line++; 1444246074Sgabor if (pipefp != NULL) 1445246074Sgabor fputs(buf, pipefp); 1446246074Sgabor if (strEQ(buf, ".\n")) 1447246074Sgabor break; 1448246074Sgabor } 1449246074Sgabor } 1450246074Sgabor } else { 1451246074Sgabor next_intuit_at(beginning_of_this_line, p_input_line); 1452246074Sgabor break; 1453246074Sgabor } 1454246074Sgabor } 1455246074Sgabor if (pipefp == NULL) 1456246074Sgabor return; 1457246074Sgabor fprintf(pipefp, "w\n"); 1458246074Sgabor fprintf(pipefp, "q\n"); 1459246074Sgabor fflush(pipefp); 1460246074Sgabor pclose(pipefp); 1461246074Sgabor ignore_signals(); 1462246074Sgabor if (!check_only) { 1463246074Sgabor if (move_file(TMPOUTNAME, outname) < 0) { 1464246074Sgabor toutkeep = true; 1465246074Sgabor chmod(TMPOUTNAME, filemode); 1466246074Sgabor } else 1467246074Sgabor chmod(outname, filemode); 1468246074Sgabor } 1469246074Sgabor set_signals(1); 1470246074Sgabor} 1471246074Sgabor 1472246074Sgabor/* 1473246074Sgabor * Choose the name of the file to be patched based on POSIX rules. 1474246074Sgabor * NOTE: the POSIX rules are amazingly stupid and we only follow them 1475246074Sgabor * if the user specified --posix or set POSIXLY_CORRECT. 1476246074Sgabor */ 1477246074Sgaborstatic char * 1478246074Sgaborposix_name(const struct file_name *names, bool assume_exists) 1479246074Sgabor{ 1480246074Sgabor char *path = NULL; 1481246074Sgabor int i; 1482246074Sgabor 1483246074Sgabor /* 1484246074Sgabor * POSIX states that the filename will be chosen from one 1485246074Sgabor * of the old, new and index names (in that order) if 1486246074Sgabor * the file exists relative to CWD after -p stripping. 1487246074Sgabor */ 1488246074Sgabor for (i = 0; i < MAX_FILE; i++) { 1489246074Sgabor if (names[i].path != NULL && names[i].exists) { 1490246074Sgabor path = names[i].path; 1491246074Sgabor break; 1492246074Sgabor } 1493246074Sgabor } 1494246074Sgabor if (path == NULL && !assume_exists) { 1495246074Sgabor /* 1496246074Sgabor * No files found, look for something we can checkout from 1497246074Sgabor * RCS/SCCS dirs. Same order as above. 1498246074Sgabor */ 1499246074Sgabor for (i = 0; i < MAX_FILE; i++) { 1500246074Sgabor if (names[i].path != NULL && 1501246074Sgabor (path = checked_in(names[i].path)) != NULL) 1502246074Sgabor break; 1503246074Sgabor } 1504246074Sgabor /* 1505246074Sgabor * Still no match? Check to see if the diff could be creating 1506246074Sgabor * a new file. 1507246074Sgabor */ 1508246074Sgabor if (path == NULL && ok_to_create_file && 1509246074Sgabor names[NEW_FILE].path != NULL) 1510246074Sgabor path = names[NEW_FILE].path; 1511246074Sgabor } 1512246074Sgabor 1513246074Sgabor return path ? savestr(path) : NULL; 1514246074Sgabor} 1515246074Sgabor 1516246074Sgabor/* 1517246074Sgabor * Choose the name of the file to be patched based the "best" one 1518246074Sgabor * available. 1519246074Sgabor */ 1520246074Sgaborstatic char * 1521246074Sgaborbest_name(const struct file_name *names, bool assume_exists) 1522246074Sgabor{ 1523246074Sgabor size_t min_components, min_baselen, min_len, tmp; 1524246074Sgabor char *best = NULL; 1525246074Sgabor int i; 1526246074Sgabor 1527246074Sgabor /* 1528246074Sgabor * The "best" name is the one with the fewest number of path 1529246074Sgabor * components, the shortest basename length, and the shortest 1530246074Sgabor * overall length (in that order). We only use the Index: file 1531246074Sgabor * if neither of the old or new files could be intuited from 1532246074Sgabor * the diff header. 1533246074Sgabor */ 1534246074Sgabor min_components = min_baselen = min_len = SIZE_MAX; 1535246074Sgabor for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1536246074Sgabor if (names[i].path == NULL || 1537246074Sgabor (!names[i].exists && !assume_exists)) 1538246074Sgabor continue; 1539246074Sgabor if ((tmp = num_components(names[i].path)) > min_components) 1540246074Sgabor continue; 1541246074Sgabor min_components = tmp; 1542246074Sgabor if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1543246074Sgabor continue; 1544246074Sgabor min_baselen = tmp; 1545246074Sgabor if ((tmp = strlen(names[i].path)) > min_len) 1546246074Sgabor continue; 1547246074Sgabor min_len = tmp; 1548246074Sgabor best = names[i].path; 1549246074Sgabor } 1550246074Sgabor if (best == NULL) { 1551246074Sgabor /* 1552246074Sgabor * No files found, look for something we can checkout from 1553246074Sgabor * RCS/SCCS dirs. Logic is identical to that above... 1554246074Sgabor */ 1555246074Sgabor min_components = min_baselen = min_len = SIZE_MAX; 1556246074Sgabor for (i = INDEX_FILE; i >= OLD_FILE; i--) { 1557246074Sgabor if (names[i].path == NULL || 1558246074Sgabor checked_in(names[i].path) == NULL) 1559246074Sgabor continue; 1560246074Sgabor if ((tmp = num_components(names[i].path)) > min_components) 1561246074Sgabor continue; 1562246074Sgabor min_components = tmp; 1563246074Sgabor if ((tmp = strlen(basename(names[i].path))) > min_baselen) 1564246074Sgabor continue; 1565246074Sgabor min_baselen = tmp; 1566246074Sgabor if ((tmp = strlen(names[i].path)) > min_len) 1567246074Sgabor continue; 1568246074Sgabor min_len = tmp; 1569246074Sgabor best = names[i].path; 1570246074Sgabor } 1571246074Sgabor /* 1572246074Sgabor * Still no match? Check to see if the diff could be creating 1573246074Sgabor * a new file. 1574246074Sgabor */ 1575246074Sgabor if (best == NULL && ok_to_create_file && 1576246074Sgabor names[NEW_FILE].path != NULL) 1577246074Sgabor best = names[NEW_FILE].path; 1578246074Sgabor } 1579246074Sgabor 1580246074Sgabor return best ? savestr(best) : NULL; 1581246074Sgabor} 1582246074Sgabor 1583246074Sgaborstatic size_t 1584246074Sgabornum_components(const char *path) 1585246074Sgabor{ 1586246074Sgabor size_t n; 1587246074Sgabor const char *cp; 1588246074Sgabor 1589246074Sgabor for (n = 0, cp = path; (cp = strchr(cp, '/')) != NULL; n++, cp++) { 1590246074Sgabor while (*cp == '/') 1591246074Sgabor cp++; /* skip consecutive slashes */ 1592246074Sgabor } 1593246074Sgabor return n; 1594246074Sgabor} 1595