echo.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <stdbool.h>
   5
   6 #define VERSION "0.01"
   7
   8 struct {
   9     bool escape;
  10     bool newline;
  11 } flags;
  12
  13 void usage(char *program)
  14 {
  15     printf("Usage: %s [flags] [string ...]]\n", program);
  16     printf("\t-e, --escape\t\t parse escape characters.\n");
  17     printf("\t-n, --no-newline\t don't print a finishing newline.\n");
  18     printf("\n");
  19     printf("\t-h, --help\t\t print program help (this message).\n");
  20     printf("\t-v, --version\t\t print program name and version.\n");
  21 }
  22
  23 int main(int argc, char* argv[])
  24 {
  25     // flags init
  26     flags.escape  = false;
  27     flags.newline = false;
  28
  29
  30     // flag parsing
  31     int i;
  32     for (i = 1; i < argc; i++) {
  33         if (strcmp(argv[i], "-e") == 0 || strcmp(argv[i], "--escape") == 0) {
  34             flags.escape = true;
  35         } else if (strcmp(argv[i], "-n") == 0 || strcmp(argv[i], "--no-newline") == 0) {
  36             flags.newline = true;
  37         } else if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
  38             usage(argv[0]);
  39             return 0;
  40         } else if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--version") == 0) {
  41             printf("echo (mutos) v"VERSION"\n");
  42             return 0;
  43         } else {
  44             // done parsing arguments
  45             break;
  46         }
  47     }
  48
  49    // reuse i from previous loop to continue where we left off
  50     for (; i < argc; i++) {
  51
  52     }
  53     return 0;
  54 }