/*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; ) 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("%s", 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); }