From ff2bc8551c697a909118f580b26b6cb1e0e47f61 Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Wed, 11 Jun 2014 08:11:38 -0500 Subject: Promote strings. --- toys/posix/strings.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 toys/posix/strings.c (limited to 'toys/posix') diff --git a/toys/posix/strings.c b/toys/posix/strings.c new file mode 100644 index 00000000..a872cf6a --- /dev/null +++ b/toys/posix/strings.c @@ -0,0 +1,67 @@ +/*strings.c - print the strings of printable characters in files. + * + * Copyright 2014 Kyung-su Kim + * Copyright 2014 Kyungwan Han + * + * 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); +} -- cgit v1.2.3