sbase/nl.c

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C
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/* See LICENSE file for copyright and license details. */
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "text.h"
#include "util.h"
static void nl(FILE *, const char *);
static char mode = 't';
static const char *sep = "\t";
static long incr = 1;
static regex_t preg;
int
main(int argc, char *argv[])
{
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char c;
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FILE *fp;
while((c = getopt(argc, argv, "b:i:s:")) != -1)
switch(c) {
case 'b':
mode = optarg[0];
if(optarg[0] == 'p')
regcomp(&preg, &optarg[1], REG_NOSUB);
else if(!strchr("ant", optarg[0]) || optarg[1] != '\0')
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eprintf("usage: %s [-b mode] [-i increment] [-s separator] [file...]\n", argv[0]);
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break;
case 'i':
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incr = estrtol(optarg, 0);
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break;
case 's':
sep = optarg;
break;
default:
exit(EXIT_FAILURE);
}
if(optind == argc)
nl(stdin, "<stdin>");
else for(; optind < argc; optind++) {
if(!(fp = fopen(argv[optind], "r")))
eprintf("fopen %s:", argv[optind]);
nl(fp, argv[optind]);
fclose(fp);
}
return EXIT_SUCCESS;
}
void
nl(FILE *fp, const char *str)
{
char *buf = NULL;
long n = 0;
size_t size = 0;
while(afgets(&buf, &size, fp))
if((mode == 'a')
|| (mode == 'p' && !regexec(&preg, buf, 0, NULL, 0))
|| (mode == 't' && buf[0] != '\n'))
printf("%6ld%s%s", n += incr, sep, buf);
else
printf(" %s", buf);
free(buf);
}