/* $OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $ */ /* * patch - a program to apply diffs to original files * * Copyright 1986, Larry Wall * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following condition is met: * 1. Redistributions of source code must retain the above copyright notice, * this condition and the following disclaimer. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * -C option added in 1998, original code by Marc Espie, based on FreeBSD * behaviour */ #ifndef lint static const char rcsid[] = "$OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $"; #endif /* not lint */ #include <sys/types.h> #include <sys/file.h> #include <sys/stat.h> #include <sys/mman.h> #include <ctype.h> #include <libgen.h> #include <limits.h> #include <stddef.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "common.h" #include "util.h" #include "pch.h" #include "inp.h" /* Input-file-with-indexable-lines abstract type */ static off_t i_size; /* size of the input file */ static char *i_womp; /* plan a buffer for entire file */ static char **i_ptr; /* pointers to lines in i_womp */ static int tifd = -1; /* plan b virtual string array */ static char *tibuf[2]; /* plan b buffers */ static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ static LINENUM lines_per_buf; /* how many lines per buffer */ static int tireclen; /* length of records in tmp file */ static bool rev_in_string(const char *); static bool reallocate_lines(size_t *); /* returns false if insufficient memory */ static bool plan_a(const char *); static void plan_b(const char *); /* New patch--prepare to edit another file. */ void re_input(void) { if (using_plan_a) { i_size = 0; free(i_ptr); i_ptr = NULL; if (i_womp != NULL) { munmap(i_womp, i_size); i_womp = NULL; } } else { using_plan_a = true; /* maybe the next one is smaller */ close(tifd); tifd = -1; free(tibuf[0]); free(tibuf[1]); tibuf[0] = tibuf[1] = NULL; tiline[0] = tiline[1] = -1; tireclen = 0; } } /* Construct the line index, somehow or other. */ void scan_input(const char *filename) { if (!plan_a(filename)) plan_b(filename); if (verbose) { say("Patching file %s using Plan %s...\n", filename, (using_plan_a ? "A" : "B")); } } static bool reallocate_lines(size_t *lines_allocated) { char **p; size_t new_size; new_size = *lines_allocated * 3 / 2; p = realloc(i_ptr, (new_size + 2) * sizeof(char *)); if (p == NULL) { /* shucks, it was a near thing */ munmap(i_womp, i_size); i_womp = NULL; free(i_ptr); i_ptr = NULL; *lines_allocated = 0; return false; } *lines_allocated = new_size; i_ptr = p; return true; } /* Try keeping everything in memory. */ static bool plan_a(const char *filename) { int ifd, statfailed; char *p, *s, lbuf[MAXLINELEN]; struct stat filestat; off_t i; ptrdiff_t sz; size_t iline, lines_allocated; #ifdef DEBUGGING if (debug & 8) return false; #endif if (filename == NULL || *filename == '\0') return false; statfailed = stat(filename, &filestat); if (statfailed && ok_to_create_file) { if (verbose) say("(Creating file %s...)\n", filename); /* * in check_patch case, we still display `Creating file' even * though we're not. The rule is that -C should be as similar * to normal patch behavior as possible */ if (check_only) return true; makedirs(filename, true); close(creat(filename, 0666)); statfailed = stat(filename, &filestat); } if (statfailed && check_only) fatal("%s not found, -C mode, can't probe further\n", filename); /* For nonexistent or read-only files, look for RCS or SCCS versions. */ if (statfailed || /* No one can write to it. */ (filestat.st_mode & 0222) == 0 || /* I can't write to it. */ ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) { char *cs = NULL, *filebase, *filedir; struct stat cstat; filebase = basename(filename); filedir = dirname(filename); /* Leave room in lbuf for the diff command. */ s = lbuf + 20; #define try(f, a1, a2, a3) \ (snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0) if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || try("%s/RCS/%s%s", filedir, filebase, "") || try("%s/%s%s", filedir, filebase, RCSSUFFIX)) { snprintf(buf, sizeof buf, CHECKOUT, filename); snprintf(lbuf, sizeof lbuf, RCSDIFF, filename); cs = "RCS"; } else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || try("%s/%s%s", filedir, SCCSPREFIX, filebase)) { snprintf(buf, sizeof buf, GET, s); snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename); cs = "SCCS"; } else if (statfailed) fatal("can't find %s\n", filename); /* * else we can't write to it but it's not under a version * control system, so just proceed. */ if (cs) { if (!statfailed) { if ((filestat.st_mode & 0222) != 0) /* The owner can write to it. */ fatal("file %s seems to be locked " "by somebody else under %s\n", filename, cs); /* * It might be checked out unlocked. See if * it's safe to check out the default version * locked. */ if (verbose) say("Comparing file %s to default " "%s version...\n", filename, cs); if (system(lbuf)) fatal("can't check out file %s: " "differs from default %s version\n", filename, cs); } if (verbose) say("Checking out file %s from %s...\n", filename, cs); if (system(buf) || stat(filename, &filestat)) fatal("can't check out file %s from %s\n", filename, cs); } } filemode = filestat.st_mode; if (!S_ISREG(filemode)) fatal("%s is not a normal file--can't patch\n", filename); i_size = filestat.st_size; if (out_of_mem) { set_hunkmax(); /* make sure dynamic arrays are allocated */ out_of_mem = false; return false; /* force plan b because plan a bombed */ } if (i_size > SIZE_MAX) { say("block too large to mmap\n"); return false; } if ((ifd = open(filename, O_RDONLY)) < 0) pfatal("can't open file %s", filename); i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0); if (i_womp == MAP_FAILED) { perror("mmap failed"); i_womp = NULL; close(ifd); return false; } close(ifd); if (i_size) madvise(i_womp, i_size, MADV_SEQUENTIAL); /* estimate the number of lines */ lines_allocated = i_size / 25; if (lines_allocated < 100) lines_allocated = 100; if (!reallocate_lines(&lines_allocated)) return false; /* now scan the buffer and build pointer array */ iline = 1; i_ptr[iline] = i_womp; /* test for NUL too, to maintain the behavior of the original code */ for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) { if (*s == '\n') { if (iline == lines_allocated) { if (!reallocate_lines(&lines_allocated)) return false; } /* these are NOT NUL terminated */ i_ptr[++iline] = s + 1; } } /* if the last line contains no EOL, append one */ if (i_size > 0 && i_womp[i_size - 1] != '\n') { last_line_missing_eol = true; /* fix last line */ sz = s - i_ptr[iline]; p = malloc(sz + 1); if (p == NULL) { free(i_ptr); i_ptr = NULL; munmap(i_womp, i_size); i_womp = NULL; return false; } memcpy(p, i_ptr[iline], sz); p[sz] = '\n'; i_ptr[iline] = p; /* count the extra line and make it point to some valid mem */ i_ptr[++iline] = ""; } else last_line_missing_eol = false; input_lines = iline - 1; /* now check for revision, if any */ if (revision != NULL) { if (!rev_in_string(i_womp)) { if (force) { if (verbose) say("Warning: this file doesn't appear " "to be the %s version--patching anyway.\n", revision); } else if (batch) { fatal("this file doesn't appear to be the " "%s version--aborting.\n", revision); } else { ask("This file doesn't appear to be the " "%s version--patch anyway? [n] ", revision); if (*buf != 'y') fatal("aborted\n"); } } else if (verbose) say("Good. This file appears to be the %s version.\n", revision); } return true; /* plan a will work */ } /* Keep (virtually) nothing in memory. */ static void plan_b(const char *filename) { FILE *ifp; size_t i = 0, j, maxlen = 1; char *p; bool found_revision = (revision == NULL); using_plan_a = false; if ((ifp = fopen(filename, "r")) == NULL) pfatal("can't open file %s", filename); (void) unlink(TMPINNAME); if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0) pfatal("can't open file %s", TMPINNAME); while (fgets(buf, sizeof buf, ifp) != NULL) { if (revision != NULL && !found_revision && rev_in_string(buf)) found_revision = true; if ((i = strlen(buf)) > maxlen) maxlen = i; /* find longest line */ } last_line_missing_eol = i > 0 && buf[i - 1] != '\n'; if (last_line_missing_eol && maxlen == i) maxlen++; if (revision != NULL) { if (!found_revision) { if (force) { if (verbose) say("Warning: this file doesn't appear " "to be the %s version--patching anyway.\n", revision); } else if (batch) { fatal("this file doesn't appear to be the " "%s version--aborting.\n", revision); } else { ask("This file doesn't appear to be the %s " "version--patch anyway? [n] ", revision); if (*buf != 'y') fatal("aborted\n"); } } else if (verbose) say("Good. This file appears to be the %s version.\n", revision); } fseek(ifp, 0L, SEEK_SET); /* rewind file */ lines_per_buf = BUFFERSIZE / maxlen; tireclen = maxlen; tibuf[0] = malloc(BUFFERSIZE + 1); if (tibuf[0] == NULL) fatal("out of memory\n"); tibuf[1] = malloc(BUFFERSIZE + 1); if (tibuf[1] == NULL) fatal("out of memory\n"); for (i = 1;; i++) { p = tibuf[0] + maxlen * (i % lines_per_buf); if (i % lines_per_buf == 0) /* new block */ if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) pfatal("can't write temp file"); if (fgets(p, maxlen + 1, ifp) == NULL) { input_lines = i - 1; if (i % lines_per_buf != 0) if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) pfatal("can't write temp file"); break; } j = strlen(p); /* These are '\n' terminated strings, so no need to add a NUL */ if (j == 0 || p[j - 1] != '\n') p[j] = '\n'; } fclose(ifp); close(tifd); if ((tifd = open(TMPINNAME, O_RDONLY)) < 0) pfatal("can't reopen file %s", TMPINNAME); } /* * Fetch a line from the input file, \n terminated, not necessarily \0. */ char * ifetch(LINENUM line, int whichbuf) { if (line < 1 || line > input_lines) { if (warn_on_invalid_line) { say("No such line %ld in input file, ignoring\n", line); warn_on_invalid_line = false; } return NULL; } if (using_plan_a) return i_ptr[line]; else { LINENUM offline = line % lines_per_buf; LINENUM baseline = line - offline; if (tiline[0] == baseline) whichbuf = 0; else if (tiline[1] == baseline) whichbuf = 1; else { tiline[whichbuf] = baseline; if (lseek(tifd, (off_t) (baseline / lines_per_buf * BUFFERSIZE), SEEK_SET) < 0) pfatal("cannot seek in the temporary input file"); if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) pfatal("error reading tmp file %s", TMPINNAME); } return tibuf[whichbuf] + (tireclen * offline); } } /* * True if the string argument contains the revision number we want. */ static bool rev_in_string(const char *string) { const char *s; size_t patlen; if (revision == NULL) return true; patlen = strlen(revision); if (strnEQ(string, revision, patlen) && isspace(string[patlen])) return true; for (s = string; *s; s++) { if (isspace(*s) && strnEQ(s + 1, revision, patlen) && isspace(s[patlen + 1])) { return true; } } return false; }