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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>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/strings.html
*
* Deviations from posix: we don't readahead to the end of the string to see
* if it ends with NUL or newline before printing. Add -o. We always do -a
* (and accept but don't document the flag), but that's sort of conformant.
* Posix' STDOUT section says things like "%o %s" and we support 64 bit offsets.
*
* TODO: utf8 strings
USE_STRINGS(NEWTOY(strings, "t:an#=4<1fo", TOYFLAG_USR|TOYFLAG_BIN))
config STRINGS
bool "strings"
default y
help
usage: strings [-fo] [-t oxd] [-n LEN] [FILE...]
Display printable strings in a binary file
-f Show filename
-n At least LEN characters form a string (default 4)
-o Show offset (ala -t d)
-t Show offset type (o=octal, d=decimal, x=hexadecimal)
*/
#define FOR_strings
#include "toys.h"
GLOBALS(
long n;
char *t;
)
static void do_strings(int fd, char *filename)
{
int nread, i, wlen = TT.n, count = 0;
off_t offset = 0;
char *string = 0, pattern[8];
if (TT.t) if (!(string = strchr("oxd", *TT.t))) error_exit("-t needs oxd");
sprintf(pattern, "%%7ll%c ", string ? *string : 'd');
// input buffer can wrap before we have enough data to output, so
// copy start of string to temporary buffer until enough to output
string = xzalloc(wlen+1);
for (i = nread = 0; ;i++) {
if (i >= nread) {
nread = read(fd, toybuf, sizeof(toybuf));
i = 0;
if (nread < 0) perror_msg_raw(filename);
if (nread < 1) {
if (count) goto flush;
break;
}
}
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|FLAG_t))
printf(pattern, (long long)(offset - wlen));
printf("%s", string);
}
}
continue;
}
flush:
// End of previous string
if (count == wlen) xputc('\n');
count = 0;
}
xclose(fd);
free(string);
}
void strings_main(void)
{
loopfiles(toys.optargs, do_strings);
}
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