From f97eaf158aa0baf868f0b19d192f7d302c1484e9 Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Thu, 1 Aug 2013 17:21:38 -0500 Subject: Cleanup grep: help text, whitespace, add parentheses. --- toys/pending/grep.c | 141 +++++++++++++++++++++++++++++----------------------- 1 file changed, 78 insertions(+), 63 deletions(-) (limited to 'toys/pending/grep.c') diff --git a/toys/pending/grep.c b/toys/pending/grep.c index 8810580b..ed13c393 100644 --- a/toys/pending/grep.c +++ b/toys/pending/grep.c @@ -11,26 +11,28 @@ config GREP bool "grep" default n help - usage: grep [-clq] [-EFHbhinosvw] (-e RE | -f REfile | RE) [file...] - - modes: - default: print lines from each file what match regular expression RE. - -c: print the number of matching lines in each file. - -l: print all matching file names. - -q: print nil; quit with code 0 when match found. - - flags: - -E: extended RE syntax - -F: fixed RE syntax, i.e. all characters literal - -H: print file name - -b: print byte offset of match - -h: not print file name - -i: case insensitive - -n: print line numbers - -o: print only matching part - -s: keep silent on error - -v: invert match - -w: match full word only + usage: grep [-EFivw] [-cloqs] [-Hbhn] [-e REGEX]... [-f FILENAME] [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 -v invert match + -w whole words (implies -E) + + 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) + + prefix modes (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 @@ -45,7 +47,8 @@ GLOBALS( char mode, *re_xs; ) -static void do_grep (int fd, char *name) { +static void do_grep(int fd, char *name) +{ int n = 0, nMatch = 0, which = toys.optflags & FLAG_w ? 2 : 0; for (;;) { @@ -53,112 +56,124 @@ static void do_grep (int fd, char *name) { regmatch_t matches[3]; int atBOL = 1; - x = get_rawline (fd, 0, '\n'); + x = get_rawline(fd, 0, '\n'); if (!x) break; y = x; n++; /* start at 1 */ - while (regexec (&re, y, 3, matches, atBOL ? 0 : REG_NOTBOL) == 0) { + while (regexec (&re, y, 3, matches, atBOL ? 0 : REG_NOTBOL) == 0) + { if (atBOL) nMatch++; toys.exitval = 0; atBOL = 0; switch (TT.mode) { case 'q': - xexit (); + xexit(); case 'l': - if (!(toys.optflags & FLAG_h)) printf ("%s\n", name); - free (x); + if (!(toys.optflags & FLAG_h)) printf("%s\n", name); + free(x); return; case 'c': break; default: - if (!(toys.optflags & FLAG_h)) printf ("%s:", name); - if ( (toys.optflags & FLAG_n)) printf ("%d:", n); - if ( (toys.optflags & FLAG_b)) printf ("%ld:", lseek (0, 0, SEEK_CUR) - strlen (y) + - (toys.optflags & FLAG_o ? matches[which].rm_so : 0)); - if (!(toys.optflags & FLAG_o)) fputs (x, stdout); + if (!(toys.optflags & FLAG_h)) printf("%s:", name); + if ((toys.optflags & FLAG_n)) printf("%d:", n); + if ((toys.optflags & FLAG_b)) + printf("%ld:", lseek (0, 0, SEEK_CUR) - strlen (y) + + (toys.optflags & FLAG_o ? matches[which].rm_so : 0)); + if (!(toys.optflags & FLAG_o)) fputs(x, stdout); else { y += matches[which].rm_so; - printf ("%.*s\n", matches[which].rm_eo - matches[which].rm_so, y++); + printf("%.*s\n", matches[which].rm_eo - matches[which].rm_so, y++); } } if (!(toys.optflags & FLAG_o)) break; } - free (x); + free(x); if ((toys.optflags & FLAG_m) && nMatch >= TT.mArgu) break; } - if (TT.mode == 'c') printf ("%s:%d\n", name, nMatch); + if (TT.mode == 'c') printf("%s:%d\n", name, nMatch); } -char *regfix (char *re_xs) { +char *regfix(char *re_xs) +{ char *re_ys; int ii, jj = 0; - re_ys = xmalloc (2*strlen (re_xs) + 1); + + re_ys = xmalloc(2*strlen (re_xs) + 1); for (ii = 0; re_xs[ii]; ii++) { - if (strchr ("^.[]$()|*+?{}\\", re_xs[ii])) re_ys[jj++] = '\\'; + if (strchr("^.[]$()|*+?{}\\", re_xs[ii])) re_ys[jj++] = '\\'; re_ys[jj++] = re_xs[ii]; } re_ys[jj] = 0; + return re_ys; } -void addRE (char *x) { - if (toys.optflags & FLAG_F) x = regfix (x); - if (TT.re_xs) TT.re_xs = xastrcat (TT.re_xs, "|"); - TT.re_xs = xastrcat (TT.re_xs, x); - if (toys.optflags & FLAG_F) free (x); +void addRE(char *x) +{ + if (toys.optflags & FLAG_F) x = regfix(x); + if (TT.re_xs) TT.re_xs = xastrcat(TT.re_xs, "|"); + TT.re_xs = xastrcat(TT.re_xs, x); + if (toys.optflags & FLAG_F) free(x); } -void buildRE (void) { - for (; TT.eArgu; TT.eArgu = TT.eArgu -> next) addRE (TT.eArgu -> arg); +void buildRE(void) +{ + for (; TT.eArgu; TT.eArgu = TT.eArgu -> next) addRE(TT.eArgu -> arg); for (; TT.fArgu; TT.fArgu = TT.fArgu -> next) { FILE *f; char *x, *y; size_t l; - f = xfopen (TT.fArgu -> arg, "r"); + f = xfopen(TT.fArgu -> arg, "r"); x = 0; for (;;) { if (getline (&x, &l, f) < 0) { - if (feof (f)) break; + if (feof(f)) break; toys.exitval = 2; - perror_exit ("failed to read"); + perror_exit("failed to read"); } - y = x + strlen (x) - 1; + y = x + strlen(x) - 1; if (y[0] == '\n') y[0] = 0; - addRE (x); + addRE(x); } - free (x); - fclose (f); + free(x); + fclose(f); } if (!TT.re_xs) { if (toys.optc < 1) { toys.exitval = 2; - error_exit ("no RE"); + error_exit("no RE"); } - TT.re_xs = toys.optflags & FLAG_F ? regfix (toys.optargs[0]) : toys.optargs[0]; + TT.re_xs = (toys.optflags & FLAG_F) ? regfix(toys.optargs[0]) + : toys.optargs[0]; toys.optc--; toys.optargs++; } - TT.re_xs = xmsprintf (toys.optflags & FLAG_w ? "(^|[^_[:alnum:]])(%s)($|[^_[:alnum:]])" : "%s", TT.re_xs); + TT.re_xs = xmsprintf((toys.optflags & FLAG_w) + ? "(^|[^_[:alnum:]])(%s)($|[^_[:alnum:]])" : "%s", TT.re_xs); - if (regcomp (&re, TT.re_xs, - (toys.optflags & (FLAG_E | FLAG_F) ? REG_EXTENDED : 0) | - (toys.optflags & FLAG_i ? REG_ICASE : 0)) != 0) { + if (regcomp(&re, TT.re_xs, + ((toys.optflags & (FLAG_E | FLAG_F)) ? REG_EXTENDED : 0) | + ((toys.optflags & FLAG_i) ? REG_ICASE : 0)) != 0) { toys.exitval = 2; - error_exit ("bad RE"); + error_exit("bad RE"); } } -void grep_main (void) { - if (toys.optflags & FLAG_w && !(toys.optflags & FLAG_E || toys.optflags & FLAG_F)) error_exit ("must not use -w sans -E"); +void grep_main(void) +{ + if ((toys.optflags & FLAG_w) + && !(toys.optflags & FLAG_E || toys.optflags & FLAG_F)) + error_exit ("must not use -w sans -E"); - buildRE (); + buildRE(); if (toys.optflags & FLAG_c) TT.mode = 'c'; if (toys.optflags & FLAG_l) TT.mode = 'l'; @@ -167,6 +182,6 @@ void grep_main (void) { if (!(toys.optflags & FLAG_H) && (toys.optc < 2)) toys.optflags |= FLAG_h; toys.exitval = 1; - loopfiles_rw (toys.optargs, O_RDONLY, 0, toys.optflags & FLAG_s, do_grep); - xexit (); + loopfiles_rw(toys.optargs, O_RDONLY, 0, toys.optflags & FLAG_s, do_grep); + xexit(); } -- cgit v1.2.3