sbase/grep.c

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1.8 KiB
C
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/* See LICENSE file for copyright and license details. */
#include <regex.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
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#include "text.h"
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static void grep(FILE *, const char *, regex_t *);
static bool iflag = false;
static bool vflag = false;
static bool many;
static bool match = false;
static char mode = 0;
int
main(int argc, char *argv[])
{
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char c;
int flags = 0;
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regex_t preg;
FILE *fp;
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while((c = getopt(argc, argv, "cilnqv")) != -1)
switch(c) {
case 'c':
case 'l':
case 'n':
case 'q':
mode = c;
break;
case 'i':
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iflag = true;
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break;
case 'v':
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vflag = true;
break;
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default:
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exit(2);
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}
if(optind == argc) {
fprintf(stderr, "usage: %s [-cilnqv] pattern [files...]\n", argv[0]);
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exit(2);
}
if(mode == 'c')
flags |= REG_NOSUB;
if(iflag)
flags |= REG_ICASE;
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regcomp(&preg, argv[optind++], flags);
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many = (argc > optind+1);
if(optind == argc)
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grep(stdin, "<stdin>", &preg);
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else for(; optind < argc; optind++) {
if(!(fp = fopen(argv[optind], "r"))) {
fprintf(stderr, "fopen %s: ", argv[optind]);
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perror(NULL);
exit(2);
}
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grep(fp, argv[optind], &preg);
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fclose(fp);
}
return match ? 0 : 1;
}
void
grep(FILE *fp, const char *str, regex_t *preg)
{
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char *buf = NULL;
long n, c = 0;
size_t size = 0;
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for(n = 1; afgets(&buf, &size, fp); n++) {
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if(regexec(preg, buf, 0, NULL, 0) ^ vflag)
continue;
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switch(mode) {
case 'c':
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c++;
break;
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case 'l':
puts(str);
goto end;
case 'q':
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exit(0);
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default:
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if(many)
printf("%s:", str);
if(mode == 'n')
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printf("%ld:", n);
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fputs(buf, stdout);
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break;
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}
match = true;
}
if(mode == 'c')
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printf("%ld\n", c);
end:
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if(ferror(fp)) {
fprintf(stderr, "%s: read error: ", str);
perror(NULL);
exit(2);
}
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free(buf);
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}