Mercurial > hg > toybox
view toys/posix/grep.c @ 1261:9e105bab92e5 draft
Revert lots of half-finished local debris I didn't mean to check in with Isaac's roadmap update.
Mercurial's "import" command is still broken, committing local tree changes to files that weren't even touched by the patch because the hg developers inisist, when I point out how stupid it is, that they meant to do that. (hg record can do hunks, but import can't even track _files_.)
author | Rob Landley <rob@landley.net> |
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date | Wed, 16 Apr 2014 08:54:19 -0500 |
parents | 6ca31490f581 |
children | 5fac2769a159 |
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/* grep.c - print lines what match given regular expression * * Copyright 2013 CE Strake <strake888 at gmail.com> * * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html USE_GREP(NEWTOY(grep, "ZzEFHabhinorsvwclqe*f*m#x[!wx][!EFw]", TOYFLAG_BIN)) USE_GREP(OLDTOY(egrep, grep, OPTSTR_grep, TOYFLAG_BIN)) USE_GREP(OLDTOY(fgrep, grep, OPTSTR_grep, TOYFLAG_BIN)) config GREP bool "grep" default y help usage: grep [-EFivwcloqsHbhn] [-m MAX] [-e REGEX]... [-f REGFILE] [FILE]... Show lines matching regular expressions. If no -e, first argument is regular expression to match. With no files (or "-" filename) read stdin. Returns 0 if matched, 1 if no match found. -e Regex to match. (May be repeated.) -f File containing regular expressions to match. match type: -E extended regex syntax -F fixed (match literal string) -i case insensitive -m stop after this many lines matched -r recursive (on dir) -v invert match -w whole word (implies -E) -x whole line -z input NUL terminated display modes: (default: matched line) -c count of matching lines -l show matching filenames -o only matching part -q quiet (errors only) -s silent (no error msg) -Z output NUL terminated output prefix (default: filename if checking more than 1 file) -H force filename -b byte offset of match -h hide filename -n line number of match */ #define FOR_grep #include "toys.h" #include <regex.h> GLOBALS( long m; struct arg_list *f; struct arg_list *e; struct arg_list *regex; ) static void do_grep(int fd, char *name) { FILE *file = fdopen(fd, "r"); long offset = 0; int lcount = 0, mcount = 0, which = toys.optflags & FLAG_w ? 2 : 0; char indelim = '\n' * !(toys.optflags&FLAG_z), outdelim = '\n' * !(toys.optflags&FLAG_Z); if (!fd) name = "(standard input)"; if (!file) { perror_msg("%s", name); return; } for (;;) { char *line = 0, *start; regmatch_t matches[3]; size_t unused; long len; int mmatch = 0; lcount++; if (0 > (len = getdelim(&line, &unused, indelim, file))) break; if (line[len-1] == indelim) line[len-1] = 0; start = line; for (;;) { int rc = 0, skip = 0; if (toys.optflags & FLAG_F) { struct arg_list *seek, fseek; char *s = 0; for (seek = TT.e; seek; seek = seek->next) { if (toys.optflags & FLAG_x) { int i = (toys.optflags & FLAG_i); if ((i ? strcasecmp : strcmp)(seek->arg, line)) s = line; } else if (!*seek->arg) { seek = &fseek; fseek.arg = s = line; break; } if (toys.optflags & FLAG_i) { long ll = strlen(seek->arg);; // Alas, posix hasn't got strcasestr() for (s = line; *s; s++) if (!strncasecmp(s, seek->arg, ll)) break; if (!*s) s = 0; } else s = strstr(line, seek->arg); if (s) break; } if (s) { matches[which].rm_so = (s-line); skip = matches[which].rm_eo = (s-line)+strlen(seek->arg); } else rc = 1; } else { rc = regexec((regex_t *)toybuf, start, 3, matches, start==line ? 0 : REG_NOTBOL); skip = matches[which].rm_eo; } if (toys.optflags & FLAG_x) if (matches[which].rm_so || line[matches[which].rm_eo]) rc = 1; if (toys.optflags & FLAG_v) { if (toys.optflags & FLAG_o) { if (rc) skip = matches[which].rm_eo = strlen(start); else if (!matches[which].rm_so) { start += skip; continue; } else matches[which].rm_eo = matches[which].rm_so; } else { if (!rc) break; matches[which].rm_eo = strlen(start); } matches[which].rm_so = 0; } else if (rc) break; mmatch++; toys.exitval = 0; if (toys.optflags & FLAG_q) xexit(); if (toys.optflags & FLAG_l) { printf("%s%c", name, outdelim); free(line); fclose(file); return; } if (toys.optflags & FLAG_o) if (matches[which].rm_eo == matches[which].rm_so) break; if (!(toys.optflags & FLAG_c)) { if (toys.optflags & FLAG_H) printf("%s:", name); if (toys.optflags & FLAG_n) printf("%d:", lcount); if (toys.optflags & FLAG_b) printf("%ld:", offset + (start-line) + ((toys.optflags & FLAG_o) ? matches[which].rm_so : 0)); if (!(toys.optflags & FLAG_o)) xprintf("%s%c", line, outdelim); else { xprintf("%.*s%c", matches[which].rm_eo - matches[which].rm_so, start + matches[which].rm_so, outdelim); } } start += skip; if (!(toys.optflags & FLAG_o) || !*start) break; } offset += len; free(line); if (mmatch) mcount++; if ((toys.optflags & FLAG_m) && mcount >= TT.m) break; } if (toys.optflags & FLAG_c) { if (toys.optflags & FLAG_H) printf("%s:", name); xprintf("%d%c", mcount, outdelim); } // loopfiles will also close the fd, but this frees an (opaque) struct. fclose(file); } static void parse_regex(void) { struct arg_list *al, *new, *list = NULL; long len = 0; char *s, *ss; // Add all -f lines to -e list. (Yes, this is leaking allocation context for // exit to free. Not supporting nofork for this command any time soon.) al = TT.f ? TT.f : TT.e; while (al) { if (TT.f) s = ss = xreadfile(al->arg, 0, 0); else s = ss = al->arg; do { ss = strchr(s, '\n'); if (ss) *(ss++) = 0; new = xmalloc(sizeof(struct arg_list)); new->next = list; new->arg = s; list = new; s = ss; } while (ss && *s); al = al->next; if (!al && TT.f) { TT.f = 0; al = TT.e; } } TT.e = list; if (!(toys.optflags & FLAG_F)) { int w = toys.optflags & FLAG_w; char *regstr; // Convert strings to one big regex if (w) len = 36; for (al = TT.e; al; al = al->next) len += strlen(al->arg)+1+!(toys.optflags & FLAG_E); regstr = s = xmalloc(len); if (w) s = stpcpy(s, "(^|[^_[:alnum:]])("); for (al = TT.e; al; al = al->next) { s = stpcpy(s, al->arg); if (!(toys.optflags & FLAG_E)) *(s++) = '\\'; *(s++) = '|'; } *(s-=(1+!(toys.optflags & FLAG_E))) = 0; if (w) strcpy(s, ")($|[^_[:alnum:]])"); w = regcomp((regex_t *)toybuf, regstr, ((toys.optflags & FLAG_E) ? REG_EXTENDED : 0) | ((toys.optflags & FLAG_i) ? REG_ICASE : 0)); if (w) { regerror(w, (regex_t *)toybuf, toybuf+sizeof(regex_t), sizeof(toybuf)-sizeof(regex_t)); error_exit("bad REGEX: %s", toybuf); } } } static int do_grep_r(struct dirtree *new) { char *name; if (new->parent && !dirtree_notdotdot(new)) return 0; if (S_ISDIR(new->st.st_mode)) return DIRTREE_RECURSE; // "grep -r onefile" doesn't show filenames, but "grep -r onedir" should. if (new->parent && !(toys.optflags & FLAG_h)) toys.optflags |= FLAG_H; name = dirtree_path(new, 0); do_grep(openat(dirtree_parentfd(new), new->name, 0), name); free(name); return 0; } void grep_main(void) { char **ss; // Handle egrep and fgrep if (*toys.which->name == 'e' || (toys.optflags & FLAG_w)) toys.optflags |= FLAG_E; if (*toys.which->name == 'f') toys.optflags |= FLAG_F; if (!TT.e && !TT.f) { if (!*toys.optargs) error_exit("no REGEX"); TT.e = xzalloc(sizeof(struct arg_list)); TT.e->arg = *(toys.optargs++); toys.optc--; } parse_regex(); if (!(toys.optflags & FLAG_h) && toys.optc>1) toys.optflags |= FLAG_H; toys.exitval = 1; if (toys.optflags & FLAG_s) { close(2); xopen("/dev/null", O_RDWR); } if (toys.optflags & FLAG_r) { for (ss=toys.optargs; *ss; ss++) { if (!strcmp(*ss, "-")) do_grep(0, *ss); else dirtree_read(*ss, do_grep_r); } } else loopfiles_rw(toys.optargs, O_RDONLY, 0, 1, do_grep); }