sbase/strings.c

63 lines
1.0 KiB
C

/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include "util.h"
static void dostrings(FILE *fp, const char *fname);
static void
usage(void)
{
eprintf("usage: %s [file ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
FILE *fp;
int ret = 0;
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc == 0) {
dostrings(stdin, "<stdin>");
} else {
for (; argc > 0; argc--, argv++) {
if (!(fp = fopen(argv[0], "r"))) {
weprintf("fopen %s:", argv[0]);
ret = 1;
continue;
}
dostrings(fp, argv[0]);
fclose(fp);
}
}
return ret;
}
static void
dostrings(FILE *fp, const char *fname)
{
unsigned char buf[BUFSIZ];
int c, i = 0;
off_t offset = 0;
do {
offset++;
if (isprint(c = getc(fp)))
buf[i++] = c;
if ((!isprint(c) && i >= 6) || i == sizeof(buf) - 1) {
buf[i] = '\0';
printf("%8ld: %s\n", (long)offset - i - 1, buf);
i = 0;
}
} while (c != EOF);
if (ferror(fp))
eprintf("%s: read error:", fname);
}