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prog.c

/*
 * Copyright 2005 Timo Hirvonen
 */

#include <prog.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <errno.h>

char *program_name = NULL;

void warn(const char *format, ...)
{
      va_list ap;

      fprintf(stderr, "%s: ", program_name);
      va_start(ap, format);
      vfprintf(stderr, format, ap);
      va_end(ap);
}

void warn_errno(const char *format, ...)
{
      int e = errno;
      va_list ap;

      fprintf(stderr, "%s: ", program_name);
      va_start(ap, format);
      vfprintf(stderr, format, ap);
      va_end(ap);
      fprintf(stderr, ": %s\n", strerror(e));
}

void __NORETURN die(const char *format, ...)
{
      va_list ap;

      fprintf(stderr, "%s: ", program_name);
      va_start(ap, format);
      vfprintf(stderr, format, ap);
      va_end(ap);
      exit(1);
}

void __NORETURN die_errno(const char *format, ...)
{
      int e = errno;
      va_list ap;

      fprintf(stderr, "%s: ", program_name);
      va_start(ap, format);
      vfprintf(stderr, format, ap);
      va_end(ap);
      fprintf(stderr, ": %s\n", strerror(e));
      exit(1);
}

static int short_option(int ch, const struct option *options)
{
      int i;

      for (i = 0; ; i++) {
            if (!options[i].short_opt) {
                  if (!options[i].long_opt)
                        die("unrecognized option `-%c'\n", ch);
                  continue;
            }
            if (options[i].short_opt != ch)
                  continue;
            return i;
      }
}

static int long_option(const char *opt, const struct option *options)
{
      int len, i, idx, num;

      len = strlen(opt);
      idx = -1;
      num = 0;
      for (i = 0; options[i].short_opt || options[i].long_opt; i++) {
            if (options[i].long_opt && strncmp(opt, options[i].long_opt, len) == 0) {
                  idx = i;
                  num++;
                  if (options[i].long_opt[len] == 0) {
                        /* exact */
                        num = 1;
                        break;
                  }
            }
      }
      if (num > 1)
            die("option `--%s' is ambiguous\n", opt);
      if (num == 0)
            die("unrecognized option `--%s'\n", opt);
      return idx;
}

int get_option(char **argvp[], const struct option *options, char **arg)
{
      char **argv = *argvp;
      const char *opt = *argv;
      int i;

      *arg = NULL;
      if (opt == NULL || opt[0] != '-' || opt[1] == 0)
            return -1;

      if (opt[1] == '-') {
            if (opt[2] == 0) {
                  /* '--' => no more options */
                  *argvp = argv + 1;
                  return -1;
            }
            i = long_option(opt + 2, options);
      } else if (opt[2]) {
            return -1;
      } else {
            i = short_option(opt[1], options);
      }
      argv++;
      if (options[i].has_arg) {
            if (*argv == NULL)
                  die("option `%s' requires an argument\n", opt);
            *arg = *argv++;
      }
      *argvp = argv;
      return i;
}

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