| /* grep.c - show lines matching regular expressions |
| * |
| * Copyright 2013 CE Strake <strake888 at gmail.com> |
| * |
| * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html |
| * |
| * Posix doesn't even specify -r, documenting deviations from it is silly. |
| * echo hello | grep -w '' |
| * echo '' | grep -w '' |
| * echo hello | grep -f </dev/null |
| * |
| |
| USE_GREP(NEWTOY(grep, "(line-buffered)(color):;(exclude-dir)*S(exclude)*M(include)*ZzEFHIab(byte-offset)h(no-filename)ino(only-matching)rRsvwcl(files-with-matches)q(quiet)(silent)e*f*C#B#A#m#x[!wx][!EFw]", TOYFLAG_BIN|TOYFLAG_ARGFAIL(2))) |
| USE_EGREP(OLDTOY(egrep, grep, TOYFLAG_BIN|TOYFLAG_ARGFAIL(2))) |
| USE_FGREP(OLDTOY(fgrep, grep, TOYFLAG_BIN|TOYFLAG_ARGFAIL(2))) |
| |
| config GREP |
| bool "grep" |
| default y |
| help |
| usage: grep [-EFrivwcloqsHbhn] [-ABC NUM] [-m MAX] [-e REGEX]... [-MS PATTERN]... [-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, 2 for command errors. |
| |
| -e Regex to match. (May be repeated.) |
| -f File listing regular expressions to match. |
| |
| file search: |
| -r Recurse into subdirectories (defaults FILE to ".") |
| -R Recurse into subdirectories and symlinks to directories |
| -M Match filename pattern (--include) |
| -S Skip filename pattern (--exclude) |
| --exclude-dir=PATTERN Skip directory pattern |
| -I Ignore binary files |
| |
| match type: |
| -A Show NUM lines after -B Show NUM lines before match |
| -C NUM lines context (A+B) -E extended regex syntax |
| -F fixed (literal match) -a always text (not binary) |
| -i case insensitive -m match MAX many lines |
| -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 only 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 |
| |
| config EGREP |
| bool |
| default y |
| depends on GREP |
| |
| config FGREP |
| bool |
| default y |
| depends on GREP |
| */ |
| |
| #define FOR_grep |
| #include "toys.h" |
| |
| GLOBALS( |
| long m, A, B, C; |
| struct arg_list *f, *e, *M, *S, *exclude_dir; |
| char *color; |
| |
| char *purple, *cyan, *red, *green, *grey; |
| struct double_list *reg; |
| char indelim, outdelim; |
| int found, tried; |
| ) |
| |
| struct reg { |
| struct reg *next, *prev; |
| int rc; |
| regex_t r; |
| regmatch_t m; |
| }; |
| |
| static void numdash(long num, char dash) |
| { |
| printf("%s%ld%s%c", TT.green, num, TT.cyan, dash); |
| } |
| |
| // Emit line with various potential prefixes and delimiter |
| static void outline(char *line, char dash, char *name, long lcount, long bcount, |
| unsigned trim) |
| { |
| if (!trim && FLAG(o)) return; |
| if (name && FLAG(H)) printf("%s%s%s%c", TT.purple, name, TT.cyan, dash); |
| if (FLAG(c)) { |
| printf("%s%ld", TT.grey, lcount); |
| xputc(TT.outdelim); |
| } else if (lcount && FLAG(n)) numdash(lcount, dash); |
| if (bcount && FLAG(b)) numdash(bcount-1, dash); |
| if (line) { |
| if (FLAG(color)) xputsn(FLAG(o) ? TT.red : TT.grey); |
| // support embedded NUL bytes in output |
| xputsl(line, trim); |
| xputc(TT.outdelim); |
| } |
| } |
| |
| // Show matches in one file |
| static void do_grep(int fd, char *name) |
| { |
| long lcount = 0, mcount = 0, offset = 0, after = 0, before = 0; |
| struct double_list *dlb = 0; |
| char *bars = 0; |
| FILE *file; |
| int bin = 0; |
| |
| if (!FLAG(r)) TT.tried++; |
| if (!fd) name = "(standard input)"; |
| |
| // Only run binary file check on lseekable files. |
| if (!FLAG(a) && !lseek(fd, 0, SEEK_CUR)) { |
| char buf[256]; |
| int len, i = 0; |
| wchar_t wc; |
| |
| // If the first 256 bytes don't parse as utf8, call it binary. |
| if (0<(len = read(fd, buf, 256))) { |
| lseek(fd, -len, SEEK_CUR); |
| while (i<len) { |
| bin = utf8towc(&wc, buf+i, len-i); |
| if (bin == -2) i = len; |
| if (bin<1) break; |
| i += bin; |
| } |
| bin = i!=len; |
| } |
| if (bin && FLAG(I)) return; |
| } |
| |
| if (!(file = fdopen(fd, "r"))) return perror_msg("%s", name); |
| |
| // Loop through lines of input |
| for (;;) { |
| char *line = 0, *start; |
| struct reg *shoe; |
| size_t ulen; |
| long len; |
| int matched = 0, rc = 1; |
| |
| // get next line, check and trim delimiter |
| lcount++; |
| errno = 0; |
| ulen = len = getdelim(&line, &ulen, TT.indelim, file); |
| if (errno) perror_msg("%s", name); |
| if (len<1) break; |
| if (line[ulen-1] == TT.indelim) line[--ulen] = 0; |
| |
| // Prepare for next line |
| start = line; |
| if (TT.reg) for (shoe = (void *)TT.reg; shoe; shoe = shoe->next) |
| shoe->rc = 0; |
| |
| // Loop to handle multiple matches in same line |
| do { |
| regmatch_t *mm = (void *)toybuf; |
| |
| // Handle "fixed" (literal) matches |
| if (FLAG(F)) { |
| struct arg_list *seek, fseek; |
| char *s = 0; |
| |
| for (seek = TT.e; seek; seek = seek->next) { |
| if (FLAG(x)) { |
| if (!(FLAG(i) ? strcasecmp : strcmp)(seek->arg, line)) s = line; |
| } else if (!*seek->arg) { |
| // No need to set fseek.next because this will match every line. |
| seek = &fseek; |
| fseek.arg = s = line; |
| } else if (FLAG(i)) s = strcasestr(start, seek->arg); |
| else s = strstr(start, seek->arg); |
| |
| if (s) break; |
| } |
| |
| if (s) { |
| rc = 0; |
| mm->rm_so = (s-start); |
| mm->rm_eo = (s-start)+strlen(seek->arg); |
| } else rc = 1; |
| |
| // Handle regex matches |
| } else { |
| int baseline = mm->rm_eo; |
| |
| mm->rm_so = mm->rm_eo = INT_MAX; |
| rc = 1; |
| for (shoe = (void *)TT.reg; shoe; shoe = shoe->next) { |
| |
| // Do we need to re-check this regex? |
| if (!shoe->rc) { |
| shoe->m.rm_so -= baseline; |
| shoe->m.rm_eo -= baseline; |
| if (!matched || shoe->m.rm_so<0) |
| shoe->rc = regexec0(&shoe->r, start, ulen-(start-line), 1, |
| &shoe->m, start==line ? 0 : REG_NOTBOL); |
| } |
| |
| // If we got a match, is it a _better_ match? |
| if (!shoe->rc && (shoe->m.rm_so < mm->rm_so || |
| (shoe->m.rm_so == mm->rm_so && shoe->m.rm_eo >= mm->rm_eo))) |
| { |
| mm = &shoe->m; |
| rc = 0; |
| } |
| } |
| } |
| |
| if (!rc && FLAG(x)) |
| if (mm->rm_so || line[mm->rm_eo]) rc = 1; |
| |
| if (!rc && FLAG(w)) { |
| char c = 0; |
| |
| if ((start+mm->rm_so)!=line) { |
| c = start[mm->rm_so-1]; |
| if (!isalnum(c) && c != '_') c = 0; |
| } |
| if (!c) { |
| c = start[mm->rm_eo]; |
| if (!isalnum(c) && c != '_') c = 0; |
| } |
| if (c) { |
| start += mm->rm_so+1; |
| continue; |
| } |
| } |
| |
| if (FLAG(v)) { |
| if (FLAG(o)) { |
| if (rc) { |
| mm->rm_so = 0; |
| mm->rm_eo = ulen-(start-line); |
| } else if (!mm->rm_so) { |
| start += mm->rm_eo; |
| continue; |
| } else mm->rm_eo = mm->rm_so; |
| } else { |
| if (!rc) break; |
| mm->rm_eo = ulen-(start-line); |
| } |
| mm->rm_so = 0; |
| } else if (rc) break; |
| |
| // At least one line we didn't print since match while -ABC active |
| if (bars) { |
| xputs(bars); |
| bars = 0; |
| } |
| matched++; |
| TT.found = 1; |
| if (FLAG(q)) { |
| toys.exitval = 0; |
| xexit(); |
| } |
| if (FLAG(l)) { |
| xprintf("%s%c", name, TT.outdelim); |
| free(line); |
| fclose(file); |
| return; |
| } |
| |
| if (!FLAG(c)) { |
| long bcount = 1 + offset + (start-line) + (FLAG(o) ? mm->rm_so : 0); |
| |
| if (bin) printf("Binary file %s matches\n", name); |
| else if (FLAG(o)) |
| outline(start+mm->rm_so, ':', name, lcount, bcount, |
| mm->rm_eo-mm->rm_so); |
| else { |
| while (dlb) { |
| struct double_list *dl = dlist_pop(&dlb); |
| unsigned *uu = (void *)(dl->data+(strlen(dl->data)|3)+1); |
| |
| outline(dl->data, '-', name, lcount-before, uu[0]+1, uu[1]); |
| free(dl->data); |
| free(dl); |
| before--; |
| } |
| |
| if (matched==1) |
| outline(FLAG(color) ? 0 : line, ':', name, lcount, bcount, ulen); |
| if (FLAG(color)) { |
| xputsn(TT.grey); |
| if (mm->rm_so) xputsl(line, mm->rm_so); |
| xputsn(TT.red); |
| xputsl(line+mm->rm_so, mm->rm_eo-mm->rm_so); |
| } |
| |
| if (TT.A) after = TT.A+1; |
| } |
| } |
| |
| start += mm->rm_eo; |
| if (mm->rm_so == mm->rm_eo) break; |
| if (!FLAG(o) && FLAG(color)) break; |
| } while (*start); |
| offset += len; |
| |
| if (matched) { |
| // Finish off pending line color fragment. |
| if (FLAG(color) && !FLAG(o)) { |
| xputsn(TT.grey); |
| if (ulen > start-line) xputsl(start, ulen-(start-line)); |
| xputc(TT.outdelim); |
| } |
| mcount++; |
| } else { |
| int discard = (after || TT.B); |
| |
| if (after && --after) { |
| outline(line, '-', name, lcount, 0, ulen); |
| discard = 0; |
| } |
| if (discard && TT.B) { |
| unsigned *uu, ul = (ulen|3)+1; |
| |
| line = xrealloc(line, ul+8); |
| uu = (void *)(line+ul); |
| uu[0] = offset-len; |
| uu[1] = ulen; |
| dlist_add(&dlb, line); |
| line = 0; |
| if (++before>TT.B) { |
| struct double_list *dl; |
| |
| dl = dlist_pop(&dlb); |
| free(dl->data); |
| free(dl); |
| before--; |
| } else discard = 0; |
| } |
| // If we discarded a line while displaying context, show bars before next |
| // line (but don't show them now in case that was last match in file) |
| if (discard && mcount) bars = "--"; |
| } |
| free(line); |
| |
| if (FLAG(m) && mcount >= TT.m) break; |
| } |
| |
| if (FLAG(c)) outline(0, ':', name, mcount, 0, 1); |
| |
| // loopfiles will also close the fd, but this frees an (opaque) struct. |
| fclose(file); |
| while (dlb) { |
| struct double_list *dl = dlist_pop(&dlb); |
| |
| free(dl->data); |
| free(dl); |
| } |
| } |
| |
| static void parse_regex(void) |
| { |
| struct arg_list *al, *new, *list = NULL; |
| 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; |
| |
| // Split lines at \n, add individual lines to new list. |
| do { |
| // TODO: NUL terminated input shouldn't split -e at \n |
| 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); |
| |
| // Advance, when we run out of -f switch to -e. |
| al = al->next; |
| if (!al && TT.f) { |
| TT.f = 0; |
| al = TT.e; |
| } |
| } |
| TT.e = list; |
| |
| if (!FLAG(F)) { |
| // Convert regex list |
| for (al = TT.e; al; al = al->next) { |
| struct reg *shoe; |
| |
| if (FLAG(o) && !*al->arg) continue; |
| dlist_add_nomalloc(&TT.reg, (void *)(shoe = xmalloc(sizeof(struct reg)))); |
| xregcomp(&shoe->r, al->arg, |
| (REG_EXTENDED*!!FLAG(E))|(REG_ICASE*!!FLAG(i))); |
| } |
| dlist_terminate(TT.reg); |
| } |
| } |
| |
| static int do_grep_r(struct dirtree *new) |
| { |
| struct arg_list *al; |
| char *name; |
| |
| if (!new->parent) TT.tried++; |
| if (!dirtree_notdotdot(new)) return 0; |
| if (S_ISDIR(new->st.st_mode)) { |
| for (al = TT.exclude_dir; al; al = al->next) |
| if (!fnmatch(al->arg, new->name, 0)) return 0; |
| return DIRTREE_RECURSE|(FLAG(R)?DIRTREE_SYMFOLLOW:0); |
| } |
| if (TT.S || TT.M) { |
| for (al = TT.S; al; al = al->next) |
| if (!fnmatch(al->arg, new->name, 0)) return 0; |
| |
| if (TT.M) { |
| for (al = TT.M; al; al = al->next) |
| if (!fnmatch(al->arg, new->name, 0)) break; |
| |
| if (!al) return 0; |
| } |
| } |
| |
| // "grep -r onefile" doesn't show filenames, but "grep -r onedir" should. |
| if (new->parent && !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 = toys.optargs; |
| |
| if (FLAG(color) && (!TT.color || !strcmp(TT.color, "auto")) && !isatty(1)) |
| toys.optflags &= ~FLAG_color; |
| |
| if (FLAG(color)) { |
| TT.purple = "\033[35m"; |
| TT.cyan = "\033[36m"; |
| TT.red = "\033[1;31m"; |
| TT.green = "\033[32m"; |
| TT.grey = "\033[0m"; |
| } else TT.purple = TT.cyan = TT.red = TT.green = TT.grey = ""; |
| |
| if (FLAG(R)) toys.optflags |= FLAG_r; |
| |
| // Grep exits with 2 for errors |
| toys.exitval = 2; |
| |
| if (!TT.A) TT.A = TT.C; |
| if (!TT.B) TT.B = TT.C; |
| |
| TT.indelim = '\n' * !FLAG(z); |
| TT.outdelim = '\n' * !FLAG(Z); |
| |
| // Handle egrep and fgrep |
| if (*toys.which->name == 'e') toys.optflags |= FLAG_E; |
| if (*toys.which->name == 'f') toys.optflags |= FLAG_F; |
| |
| if (!TT.e && !TT.f) { |
| if (!*ss) error_exit("no REGEX"); |
| TT.e = xzalloc(sizeof(struct arg_list)); |
| TT.e->arg = *(ss++); |
| toys.optc--; |
| } |
| |
| parse_regex(); |
| |
| if (!FLAG(h) && toys.optc>1) toys.optflags |= FLAG_H; |
| |
| if (FLAG(s)) { |
| close(2); |
| xopen_stdio("/dev/null", O_RDWR); |
| } |
| |
| if (FLAG(r)) { |
| // Iterate through -r arguments. Use "." as default if none provided. |
| for (ss = *ss ? ss : (char *[]){".", 0}; *ss; ss++) { |
| if (!strcmp(*ss, "-")) do_grep(0, *ss); |
| else dirtree_read(*ss, do_grep_r); |
| } |
| } else loopfiles_rw(ss, O_RDONLY|WARN_ONLY, 0, do_grep); |
| if (TT.tried >= toys.optc || (FLAG(q)&&TT.found)) toys.exitval = !TT.found; |
| } |
