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/*strings.c - print the strings of printable characters in files.
*
* Copyright 2014 Kyung-su Kim <kaspyx@gmail.com>
* Copyright 2014 Kyungwan Han <asura321@gmail.com>
*
* No Standard
* TODO: utf8 strings
* TODO: posix -t
USE_STRINGS(NEWTOY(strings, "an#=4<1fo", TOYFLAG_USR|TOYFLAG_BIN))
config STRINGS
bool "strings"
default y
help
usage: strings [-fo] [-n LEN] [FILE...]
Display printable strings in a binary file
-f Precede strings with filenames
-n At least LEN characters form a string (default 4)
-o Precede strings with decimal offsets
*/
#define FOR_strings
#include "toys.h"
GLOBALS(
long num;
)
static void do_strings(int fd, char *filename)
{
int nread, i, wlen = TT.num, count = 0;
off_t offset = 0;
char *string = xzalloc(wlen + 1);
for (;;) {
nread = read(fd, toybuf, sizeof(toybuf));
if (nread < 0) perror_msg_raw(filename);
if (nread < 1) break;
for (i = 0; i < nread; i++, offset++) {
if (((toybuf[i] >= 32) && (toybuf[i] <= 126)) || (toybuf[i] == '\t')) {
if (count == wlen) fputc(toybuf[i], stdout);
else {
string[count++] = toybuf[i];
if (count == wlen) {
if (toys.optflags & FLAG_f) printf("%s: ", filename);
if (toys.optflags & FLAG_o)
printf("%7lld ",(long long)(offset - wlen));
printf("%s", string);
}
}
} else {
if (count == wlen) xputc('\n');
count = 0;
}
}
}
xclose(fd);
free(string);
}
void strings_main(void)
{
loopfiles(toys.optargs, do_strings);
}
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