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Diffstat (limited to '')
| -rw-r--r-- | tools/catcho.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/tools/catcho.c b/tools/catcho.c deleted file mode 100644 index 3426e50..0000000 --- a/tools/catcho.c +++ /dev/null @@ -1,204 +0,0 @@ -/* - * catcho - outputing text to the standard output - * - * Usage - * ----- - * catcho [options] - * - * Options - * ------- - * -m --mode MODE Set the initial text mode (Default: passthrough) - * -v --version Display program information and exit - * -V --verbose Duplicate stdout on stderr - * - * Modes - * ----- - * passthru / passthrough / normal / n - Input is copied to output verbatim. - * null / z - Input is dropped. - * hb - Input (interpreted as hex) is compressed to bytes on the output. - * bh - The opposite of hb. - * ib - Input (interpreted as bit-bytes) is compressed to bytes on the output. - * bi - The opposite of ib. - * - * Append 'f' to any mode (eg: bhf): Input is interpreted as '\n'-delimited - * filenames. File contents are filtered based on mode and sent to output. - * - * Switching modes - * --------------- - * When catcho receives signal SIGINT (ctrl-C from the terminal, for example), - * any pending input/output is flushed and catcho then interprets the input - * as a mode name terminated by a '\n'. Once the input provides a string\n, - * it switches the desired mode and input processing resumes. - * - * Exiting catcho - * -------------- - * Since SIGINT is used for mode switching, the 'normal' way to terminate - * catcho is by sending it an End-Of-File byte on its input. (ctrl-D on your - * terminal) - */ - -#include <stdio.h> -#include <string.h> -#include <unistd.h> -#include <getopt.h> -#include <signal.h> - -#define LAST_STR_CHAR(s) (s[strlen(s)-1]) - -/* modes */ -enum mode -{ - N, - Z, - HB, - BH, - IB, - BI -}; - -/* global state */ -static enum mode current_mode = N; -static int current_mode_f = 0; -static int current_verbose = 0; - -static size_t ccfwrite(const void *ptr, size_t size, size_t nmemb) -{ - size_t ret; - ret = fwrite(ptr, size, nmemb, stdout); - - if (current_verbose) - fwrite(ptr, size, nmemb, stderr); - - return ret; -} - -static void sigint(int sig) -{ - (void)sig; - ccfwrite("in signal handler\n", 18, 1); -} - -static int set_mode(const char *mode) -{ - if (!mode) - return 0; - - if (!strcmp(mode, "passthru") || // these don't support 'f' suffix - !strcmp(mode, "passthrough") || - !strcmp(mode, "normal")) - { - current_mode = N; - current_mode_f = 0; - } - else if (!strcmp(mode, "null")) // this doesn't support 'f' suffix - { - current_mode = Z; - current_mode_f = 0; - } - else if (!strncmp(mode, "n", 1)) - { - current_mode = N; - current_mode_f = (LAST_STR_CHAR(mode) == 'f'); - } - else if (!strncmp(mode, "z", 1)) - { - current_mode = Z; - current_mode_f = (LAST_STR_CHAR(mode) == 'f'); - } - else if (!strncmp(mode, "hb", 2)) - { - current_mode = HB; - current_mode_f = (LAST_STR_CHAR(mode) == 'f'); - } - else if (!strncmp(mode, "bh", 2)) - { - current_mode = BH; - current_mode_f = (LAST_STR_CHAR(mode) == 'f'); - } - else if (!strncmp(mode, "ib", 2)) - { - current_mode = IB; - current_mode_f = (LAST_STR_CHAR(mode) == 'f'); - } - else if (!strncmp(mode, "bi", 2)) - { - current_mode = BI; - current_mode_f = (LAST_STR_CHAR(mode) == 'f'); - } - else - { - fprintf(stderr, "Mode string '%s' not recognized\n", mode); - return 0; - } - - return 1; -} - -void show_version(const char *name) -{ - printf("%s version 1.0\n", name); -} - -int main(int argc, char **argv) -{ - /* - * handling command-line arguments: - * i'm going to leave opterr alone (defaults to non-zero) - * \this causes getopt to print its own error messages to - * stderr if things go wrong, which is fine. - */ - - const char *shortopts = "m:vV"; - - const struct option longopts[] = { - { "mode", required_argument, NULL, 'm' }, - { "version", no_argument, NULL, 'v' }, - { "verbose", no_argument, NULL, 'V' }, - { NULL, 0, NULL, 0 } - }; - - int opt; - - while ((opt = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) - { - switch (opt) - { - case '?': - return 1; - - case 'm': - if (!set_mode(optarg)) - return 1; - break; - - case 'v': - show_version(argv[0]); - return 0; - - case 'V': - current_verbose = 1; - break; - } - } - - /* setup signals (mode switch) */ - signal(SIGINT, &sigint); - - - char memes[4]; - fread(memes, 4, 1, stdin); - switch (current_mode) - { - case N: printf("NORMAL\n"); break; - case Z: printf("NULL\n"); break; - case HB: printf("hex to bytes\n"); break; - case BH: printf("bytes to hex\n"); break; - case IB: printf("bits to bytes\n"); break; - case BI: printf("bytes to bits\n"); break; - } - - printf("file mode: %i\n", current_mode_f); - printf("verbose mode: %i\n", current_verbose); - - return 0; -} |