/* $NetBSD: util.c,v 1.9 2011/02/27 17:33:37 joerg Exp $ */ /* $OpenBSD: util.c,v 1.39 2010/07/02 22:18:03 tedu Exp $ */ /*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 1999 James Howard and Dag-Erling Smørgrav * Copyright (C) 2008-2010 Gabor Kovesdan * Copyright (C) 2017 Kyle Evans * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "grep.h" static bool first_match = true; /* * Match printing context */ struct mprintc { long long tail; /* Number of trailing lines to record */ int last_outed; /* Number of lines since last output */ bool doctx; /* Printing context? */ bool printmatch; /* Printing matches? */ bool same_file; /* Same file as previously printed? */ }; static void procmatch_match(struct mprintc *mc, struct parsec *pc); static void procmatch_nomatch(struct mprintc *mc, struct parsec *pc); static bool procmatches(struct mprintc *mc, struct parsec *pc, bool matched); #ifdef WITH_INTERNAL_NOSPEC static int litexec(const struct pat *pat, const char *string, size_t nmatch, regmatch_t pmatch[]); #endif static bool procline(struct parsec *pc); static void printline(struct parsec *pc, int sep); static void printline_metadata(struct str *line, int sep); bool file_matching(const char *fname) { char *fname_base, *fname_buf; bool ret; ret = finclude ? false : true; fname_buf = strdup(fname); if (fname_buf == NULL) err(2, "strdup"); fname_base = basename(fname_buf); for (unsigned int i = 0; i < fpatterns; ++i) { if (fnmatch(fpattern[i].pat, fname, 0) == 0 || fnmatch(fpattern[i].pat, fname_base, 0) == 0) /* * The last pattern matched wins exclusion/inclusion * rights, so we can't reasonably bail out early here. */ ret = (fpattern[i].mode != EXCL_PAT); } free(fname_buf); return (ret); } static inline bool dir_matching(const char *dname) { bool ret; ret = dinclude ? false : true; for (unsigned int i = 0; i < dpatterns; ++i) { if (dname != NULL && fnmatch(dpattern[i].pat, dname, 0) == 0) /* * The last pattern matched wins exclusion/inclusion * rights, so we can't reasonably bail out early here. */ ret = (dpattern[i].mode != EXCL_PAT); } return (ret); } /* * Processes a directory when a recursive search is performed with * the -R option. Each appropriate file is passed to procfile(). */ bool grep_tree(char **argv) { FTS *fts; FTSENT *p; int fts_flags; bool matched, ok; const char *wd[] = { ".", NULL }; matched = false; /* This switch effectively initializes 'fts_flags' */ switch(linkbehave) { case LINK_EXPLICIT: fts_flags = FTS_COMFOLLOW | FTS_PHYSICAL; break; case LINK_SKIP: fts_flags = FTS_PHYSICAL; break; default: fts_flags = FTS_LOGICAL | FTS_NOSTAT; } fts_flags |= FTS_NOCHDIR; fts = fts_open((argv[0] == NULL) ? __DECONST(char * const *, wd) : argv, fts_flags, NULL); if (fts == NULL) err(2, "fts_open"); while (errno = 0, (p = fts_read(fts)) != NULL) { switch (p->fts_info) { case FTS_DNR: case FTS_ERR: case FTS_NS: file_err = true; if(!sflag) warnc(p->fts_errno, "%s", p->fts_path); break; case FTS_D: if (dexclude || dinclude) if (!dir_matching(p->fts_name) || !dir_matching(p->fts_path)) fts_set(fts, p, FTS_SKIP); break; case FTS_DC: /* Print a warning for recursive directory loop */ warnx("warning: %s: recursive directory loop", p->fts_path); break; case FTS_DP: break; case FTS_SL: /* * Skip symlinks for LINK_EXPLICIT and * LINK_SKIP. Note that due to FTS_COMFOLLOW, * symlinks on the command line are followed * for LINK_EXPLICIT and not reported as * symlinks. */ break; default: /* Check for file exclusion/inclusion */ ok = true; if (fexclude || finclude) ok &= file_matching(p->fts_path); if (ok && procfile(p->fts_path)) matched = true; break; } } if (errno != 0) err(2, "fts_read"); fts_close(fts); return (matched); } static void procmatch_match(struct mprintc *mc, struct parsec *pc) { if (mc->doctx) { if (!first_match && (!mc->same_file || mc->last_outed > 0)) printf("--\n"); if (Bflag > 0) printqueue(); mc->tail = Aflag; } /* Print the matching line, but only if not quiet/binary */ if (mc->printmatch) { printline(pc, ':'); while (pc->matchidx >= MAX_MATCHES) { /* Reset matchidx and try again */ pc->matchidx = 0; if (procline(pc) == !vflag) printline(pc, ':'); else break; } first_match = false; mc->same_file = true; mc->last_outed = 0; } } static void procmatch_nomatch(struct mprintc *mc, struct parsec *pc) { /* Deal with any -A context as needed */ if (mc->tail > 0) { grep_printline(&pc->ln, '-'); mc->tail--; if (Bflag > 0) clearqueue(); } else if (Bflag == 0 || (Bflag > 0 && enqueue(&pc->ln))) /* * Enqueue non-matching lines for -B context. If we're not * actually doing -B context or if the enqueue resulted in a * line being rotated out, then go ahead and increment * last_outed to signify a gap between context/match. */ ++mc->last_outed; } /* * Process any matches in the current parsing context, return a boolean * indicating whether we should halt any further processing or not. 'true' to * continue processing, 'false' to halt. */ static bool procmatches(struct mprintc *mc, struct parsec *pc, bool matched) { if (mflag && mcount <= 0) { /* * We already hit our match count, but we need to keep dumping * lines until we've lost our tail. */ grep_printline(&pc->ln, '-'); mc->tail--; return (mc->tail != 0); } /* * XXX TODO: This should loop over pc->matches and handle things on a * line-by-line basis, setting up a `struct str` as needed. */ /* Deal with any -B context or context separators */ if (matched) { procmatch_match(mc, pc); /* Count the matches if we have a match limit */ if (mflag) { /* XXX TODO: Decrement by number of matched lines */ mcount -= 1; if (mcount <= 0) return (mc->tail != 0); } } else if (mc->doctx) procmatch_nomatch(mc, pc); return (true); } /* * Opens a file and processes it. Each file is processed line-by-line * passing the lines to procline(). */ bool procfile(const char *fn) { struct parsec pc; struct mprintc mc; struct file *f; struct stat sb; mode_t s; int lines; bool line_matched; if (strcmp(fn, "-") == 0) { fn = label != NULL ? label : errstr[1]; f = grep_open(NULL); } else { if (stat(fn, &sb) == 0) { /* Check if we need to process the file */ s = sb.st_mode & S_IFMT; if (dirbehave == DIR_SKIP && s == S_IFDIR) return (false); if (devbehave == DEV_SKIP && (s == S_IFIFO || s == S_IFCHR || s == S_IFBLK || s == S_IFSOCK)) return (false); } f = grep_open(fn); } if (f == NULL) { file_err = true; if (!sflag) warn("%s", fn); return (false); } pc.ln.file = grep_strdup(fn); pc.ln.line_no = 0; pc.ln.len = 0; pc.ln.boff = 0; pc.ln.off = -1; pc.binary = f->binary; pc.cntlines = false; memset(&mc, 0, sizeof(mc)); mc.printmatch = true; if ((pc.binary && binbehave == BINFILE_BIN) || cflag || qflag || lflag || Lflag) mc.printmatch = false; if (mc.printmatch && (Aflag != 0 || Bflag != 0)) mc.doctx = true; if (mc.printmatch && (Aflag != 0 || Bflag != 0 || mflag || nflag)) pc.cntlines = true; mcount = mlimit; for (lines = 0; lines == 0 || !(lflag || qflag); ) { /* * XXX TODO: We need to revisit this in a chunking world. We're * not going to be doing per-line statistics because of the * overhead involved. procmatches can figure that stuff out as * needed. */ /* Reset per-line statistics */ pc.printed = 0; pc.matchidx = 0; pc.lnstart = 0; pc.ln.boff = 0; pc.ln.off += pc.ln.len + 1; /* XXX TODO: Grab a chunk */ if ((pc.ln.dat = grep_fgetln(f, &pc)) == NULL || pc.ln.len == 0) break; if (pc.ln.len > 0 && pc.ln.dat[pc.ln.len - 1] == fileeol) --pc.ln.len; pc.ln.line_no++; /* Return if we need to skip a binary file */ if (pc.binary && binbehave == BINFILE_SKIP) { grep_close(f); free(pc.ln.file); free(f); return (0); } if (mflag && mcount <= 0) { /* * Short-circuit, already hit match count and now we're * just picking up any remaining pieces. */ if (!procmatches(&mc, &pc, false)) break; continue; } line_matched = procline(&pc) == !vflag; if (line_matched) ++lines; /* Halt processing if we hit our match limit */ if (!procmatches(&mc, &pc, line_matched)) break; } if (Bflag > 0) clearqueue(); grep_close(f); if (cflag && !qflag) { if (!hflag) printf("%s:", pc.ln.file); printf("%u\n", lines); } if (lflag && !qflag && lines != 0) printf("%s%c", fn, nullflag ? 0 : '\n'); if (Lflag && !qflag && lines == 0) printf("%s%c", fn, nullflag ? 0 : '\n'); if (lines != 0 && !cflag && !lflag && !Lflag && binbehave == BINFILE_BIN && f->binary && !qflag) printf(errstr[7], fn); free(pc.ln.file); free(f); return (lines != 0); } #ifdef WITH_INTERNAL_NOSPEC /* * Internal implementation of literal string search within a string, modeled * after regexec(3), for use when the regex(3) implementation doesn't offer * either REG_NOSPEC or REG_LITERAL. This does not apply in the default FreeBSD * config, but in other scenarios such as building against libgnuregex or on * some non-FreeBSD OSes. */ static int litexec(const struct pat *pat, const char *string, size_t nmatch, regmatch_t pmatch[]) { char *(*strstr_fn)(const char *, const char *); char *sub, *subject; const char *search; size_t idx, n, ofs, stringlen; if (cflags & REG_ICASE) strstr_fn = strcasestr; else strstr_fn = strstr; idx = 0; ofs = pmatch[0].rm_so; stringlen = pmatch[0].rm_eo; if (ofs >= stringlen) return (REG_NOMATCH); subject = strndup(string, stringlen); if (subject == NULL) return (REG_ESPACE); for (n = 0; ofs < stringlen;) { search = (subject + ofs); if ((unsigned long)pat->len > strlen(search)) break; sub = strstr_fn(search, pat->pat); /* * Ignoring the empty string possibility due to context: grep optimizes * for empty patterns and will never reach this point. */ if (sub == NULL) break; ++n; /* Fill in pmatch if necessary */ if (nmatch > 0) { pmatch[idx].rm_so = ofs + (sub - search); pmatch[idx].rm_eo = pmatch[idx].rm_so + pat->len; if (++idx == nmatch) break; ofs = pmatch[idx].rm_so + 1; } else /* We only needed to know if we match or not */ break; } free(subject); if (n > 0 && nmatch > 0) for (n = idx; n < nmatch; ++n) pmatch[n].rm_so = pmatch[n].rm_eo = -1; return (n > 0 ? 0 : REG_NOMATCH); } #endif /* WITH_INTERNAL_NOSPEC */ #define iswword(x) (iswalnum((x)) || (x) == L'_') /* * Processes a line comparing it with the specified patterns. Each pattern * is looped to be compared along with the full string, saving each and every * match, which is necessary to colorize the output and to count the * matches. The matching lines are passed to printline() to display the * appropriate output. */ static bool procline(struct parsec *pc) { regmatch_t pmatch, lastmatch, chkmatch; wchar_t wbegin, wend; size_t st, nst; unsigned int i; int r = 0, leflags = eflags; size_t startm = 0, matchidx; unsigned int retry; bool lastmatched, matched; matchidx = pc->matchidx; /* Null pattern shortcuts. */ if (matchall) { if (xflag && pc->ln.len == 0) { /* Matches empty lines (-x). */ return (true); } else if (!wflag && !xflag) { /* Matches every line (no -w or -x). */ return (true); } /* * If we only have the NULL pattern, whether we match or not * depends on if we got here with -w or -x. If either is set, * the answer is no. If we have other patterns, we'll defer * to them. */ if (patterns == 0) { return (!(wflag || xflag)); } } else if (patterns == 0) { /* Pattern file with no patterns. */ return (false); } matched = false; st = pc->lnstart; nst = 0; /* Initialize to avoid a false positive warning from GCC. */ lastmatch.rm_so = lastmatch.rm_eo = 0; /* Loop to process the whole line */ while (st <= pc->ln.len) { lastmatched = false; startm = matchidx; retry = 0; if (st > 0 && pc->ln.dat[st - 1] != fileeol) leflags |= REG_NOTBOL; /* Loop to compare with all the patterns */ for (i = 0; i < patterns; i++) { pmatch.rm_so = st; pmatch.rm_eo = pc->ln.len; #ifdef WITH_INTERNAL_NOSPEC if (grepbehave == GREP_FIXED) r = litexec(&pattern[i], pc->ln.dat, 1, &pmatch); else #endif r = regexec(&r_pattern[i], pc->ln.dat, 1, &pmatch, leflags); if (r != 0) continue; /* Check for full match */ if (xflag && (pmatch.rm_so != 0 || (size_t)pmatch.rm_eo != pc->ln.len)) continue; /* Check for whole word match */ if (wflag) { wbegin = wend = L' '; if (pmatch.rm_so != 0 && sscanf(&pc->ln.dat[pmatch.rm_so - 1], "%lc", &wbegin) != 1) r = REG_NOMATCH; else if ((size_t)pmatch.rm_eo != pc->ln.len && sscanf(&pc->ln.dat[pmatch.rm_eo], "%lc", &wend) != 1) r = REG_NOMATCH; else if (iswword(wbegin) || iswword(wend)) r = REG_NOMATCH; /* * If we're doing whole word matching and we * matched once, then we should try the pattern * again after advancing just past the start of * the earliest match. This allows the pattern * to match later on in the line and possibly * still match a whole word. */ if (r == REG_NOMATCH && (retry == pc->lnstart || (unsigned int)pmatch.rm_so + 1 < retry)) retry = pmatch.rm_so + 1; if (r == REG_NOMATCH) continue; } lastmatched = true; lastmatch = pmatch; if (matchidx == 0) matched = true; /* * Replace previous match if the new one is earlier * and/or longer. This will lead to some amount of * extra work if -o/--color are specified, but it's * worth it from a correctness point of view. */ if (matchidx > startm) { chkmatch = pc->matches[matchidx - 1]; if (pmatch.rm_so < chkmatch.rm_so || (pmatch.rm_so == chkmatch.rm_so && (pmatch.rm_eo - pmatch.rm_so) > (chkmatch.rm_eo - chkmatch.rm_so))) { pc->matches[matchidx - 1] = pmatch; nst = pmatch.rm_eo; } } else { /* Advance as normal if not */ pc->matches[matchidx++] = pmatch; nst = pmatch.rm_eo; } /* avoid excessive matching - skip further patterns */ if ((color == NULL && !oflag) || qflag || lflag || matchidx >= MAX_MATCHES) { pc->lnstart = nst; lastmatched = false; break; } } /* * Advance to just past the start of the earliest match, try * again just in case we still have a chance to match later in * the string. */ if (!lastmatched && retry > pc->lnstart) { st = retry; continue; } /* XXX TODO: We will need to keep going, since we're chunky */ /* One pass if we are not recording matches */ if (!wflag && ((color == NULL && !oflag) || qflag || lflag || Lflag)) break; /* If we didn't have any matches or REG_NOSUB set */ if (!lastmatched || (cflags & REG_NOSUB)) nst = pc->ln.len; if (!lastmatched) /* No matches */ break; else if (st == nst && lastmatch.rm_so == lastmatch.rm_eo) /* Zero-length match -- advance one more so we don't get stuck */ nst++; /* Advance st based on previous matches */ st = nst; pc->lnstart = st; } /* Reflect the new matchidx in the context */ pc->matchidx = matchidx; return matched; } /* * Safe malloc() for internal use. */ void * grep_malloc(size_t size) { void *ptr; if (size == 0) return (NULL); if ((ptr = malloc(size)) == NULL) err(2, "malloc"); return (ptr); } /* * Safe calloc() for internal use. */ void * grep_calloc(size_t nmemb, size_t size) { void *ptr; if (nmemb == 0 || size == 0) return (NULL); if ((ptr = calloc(nmemb, size)) == NULL) err(2, "calloc"); return (ptr); } /* * Safe realloc() for internal use. */ void * grep_realloc(void *ptr, size_t size) { if ((ptr = realloc(ptr, size)) == NULL) err(2, "realloc"); return (ptr); } /* * Safe strdup() for internal use. */ char * grep_strdup(const char *str) { char *ret; if ((ret = strdup(str)) == NULL) err(2, "strdup"); return (ret); } /* * Print an entire line as-is, there are no inline matches to consider. This is * used for printing context. */ void grep_printline(struct str *line, int sep) { printline_metadata(line, sep); fwrite(line->dat, line->len, 1, stdout); putchar(fileeol); } static void printline_metadata(struct str *line, int sep) { bool printsep; printsep = false; if (!hflag) { if (!nullflag) { fputs(line->file, stdout); printsep = true; } else { printf("%s", line->file); putchar(0); } } if (nflag) { if (printsep) putchar(sep); printf("%d", line->line_no); printsep = true; } if (bflag) { if (printsep) putchar(sep); printf("%lld", (long long)(line->off + line->boff)); printsep = true; } if (printsep) putchar(sep); } /* * Prints a matching line according to the command line options. */ static void printline(struct parsec *pc, int sep) { size_t a = 0; size_t i, matchidx; regmatch_t match; /* If matchall, everything matches but don't actually print for -o */ if (oflag && matchall) return; matchidx = pc->matchidx; /* --color and -o */ if ((oflag || color) && matchidx > 0) { /* Only print metadata once per line if --color */ if (!oflag && pc->printed == 0) printline_metadata(&pc->ln, sep); for (i = 0; i < matchidx; i++) { match = pc->matches[i]; /* Don't output zero length matches */ if (match.rm_so == match.rm_eo) continue; /* * Metadata is printed on a per-line basis, so every * match gets file metadata with the -o flag. */ if (oflag) { pc->ln.boff = match.rm_so; printline_metadata(&pc->ln, sep); } else fwrite(pc->ln.dat + a, match.rm_so - a, 1, stdout); if (color) fprintf(stdout, "\33[%sm\33[K", color); fwrite(pc->ln.dat + match.rm_so, match.rm_eo - match.rm_so, 1, stdout); if (color) fprintf(stdout, "\33[m\33[K"); a = match.rm_eo; if (oflag) putchar('\n'); } if (!oflag) { if (pc->ln.len - a > 0) fwrite(pc->ln.dat + a, pc->ln.len - a, 1, stdout); putchar('\n'); } } else grep_printline(&pc->ln, sep); pc->printed++; }