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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
USE_STRINGS(NEWTOY(strings, "n#=4<1fo", TOYFLAG_USR|TOYFLAG_BIN))
config STRINGS
bool "strings"
default n
help
usage: strings [-fo] [-n count] [FILE] ...
Display printable strings in a binary file
-f Precede strings with filenames
-n [LEN] At least LEN characters form a string (default 4)
-o Precede strings with decimal offsets
*/
#define FOR_strings
#include "toys.h"
GLOBALS(
long num;
)
void do_strings(int fd, char *filename)
{
int nread, i, wlen, count = 0;
off_t offset = 0;
char *string;
string = xzalloc(TT.num + 1);
wlen = TT.num - 1;
while ((nread = read(fd,toybuf,sizeof(toybuf)))>0 ) {
for (i = 0; i < nread; i++, offset++) {
if (((toybuf[i] >= 32) && (toybuf[i] <= 126)) || (toybuf[i] == '\t')) {
if (count > wlen) xputc(toybuf[i]);
else {
string[count] = toybuf[i];
if (count == wlen) {
if (toys.optflags & FLAG_f) xprintf("%s: ", filename);
if (toys.optflags & FLAG_o)
xprintf("%7lld ",(long long)(offset - wlen));
xprintf("%s",string);
}
count++;
}
} 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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