CLI Argument Parser

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CLI Argument Parser has been written in C, and simple parses command line arguments. I’ve used it for a few applications, and will continue to do so. Well, enough said really. Feel free to post comments, bug fixes, patches, suggestions, complaints etc.

I may recode this in C++ when I have the time, but for now, it’s in C. Enjoy.

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/**
 * CLI Argument Parser
 *
 * @author  reZo <reZo@rezolabs.com>
 * @license GNU General Public License
 * @version 14th April 2008
 *
 * @bug -k=v && --key=value accepts x{1,} = chars
 */
 
/**
 * Prototype's
 */
 
#ifdef win32
#define snprintf sprintf_s
#define strtok strtok_s
#endif
 
extern struct configuration configuration;
 
void argumentShort (char *key, char *value);
void argumentLong (char *key, char *value);
#ifdef WIN32
void argumentWin32 (char *key, char *value);
#endif
void argumentUsageAndHelp (const char *programName);
char *argumentGetKey (char *key);
char *argumentGetValue (char *key);
int arguments (int argc, char *argv[]);
 
/**
 * Send argv[i] && argv[i+1] off to there correct parser's
 */
 
int arguments (int argc, char *argv[]) {
 
   if (argc == 1)
      argumentUsageAndHelp(argv[0]);
 
   int i;
 
   for (i = 1; i < argc; i++) {
      char *current = (char*) malloc(sizeof(char*) * strlen(argv[i]));
      snprintf(current, strlen(argv[i]), "%s", argv[i]);
      if (*(current) == '-' && *(current+1) == '-')
         argumentLong(argv[i], argv[i+1]);
      else if (*(current) == '-' && *(current+1) != '-')
         argumentShort(argv[i], argv[i+1]);
#ifdef WIN32
      else if (*(current) == '/')
         argumentWin32(argv[i], argv[i+1]);
#endif
   }
 
   return 0;
}
 
/**
 * CLI usage and help
 */
 
void argumentUsageAndHelp (const char *programName) {
 
   fprintf(stderr, "usage: %s (options)\n\n", programName);
#ifdef WIN32
   fprintf(stderr, "Windows help\n");
#else
   fprintf(stderr, "Non Windows help\n");
#endif
   fprintf(stderr, "\nReport bugs to <reZo@rezolabs.com>\n");
 
   exit(-1);
}
 
#ifdef WIN32
 
/**
 * Parse windows style CLI argument's
 */
 
void argumentWin32 (char *key, char *value) {
 
   if (strlen(key) <= 1) {
      fprintf(stderr, "Invalid CLI argument length (win32).\n");
      exit(-1);
   }
 
   /**
    * Settings that do not require usage of value argument
    */
 
   if (strncmp(key, "/?", 2) && strlen(key) == 2 && value == NULL)
      printf("%s argument with no value, setting to default\n", key);
 
   if (value == NULL)
      return;
 
   /**
    * Settings that require usage of value argument
    */
 
   if (strncmp(key, "/example", 5) == 0 && strlen(key) == 8)
      printf("%s %s\n", key, value);
}
 
#endif
 
/**
 * Parse short unix style CLI argument's
 *
 * @accept -k
 *         -k value
 *         -k=value
 */
 
void argumentShort (char *key, char *value) {
 
   if (strlen(key) <= 1) {
      fprintf(stderr, "Invalid CLI argument length (short).\n");
      exit(-1);
   }
 
   /**
    * Settings that do not require usage of value argument
    */
 
   if (strncmp(key, "-e", 2) == 0 && strlen(key) == 2 && value == NULL)
      printf("%s argument with no value, setting to default\n", key);
 
   /**
    * Check if we're dealing with -k=value if value is NULL
    */
 
   if (value == NULL) {
      if (strchr(key, '=') != NULL) {
         value = argumentGetValue(key);
         key = argumentGetKey(key);
      }
      else return;
   }
 
   if (strncmp(key, "-e", 2) == 0 && strlen(key) == 2)
      printf("%s %s\n", key, value);
}
 
/**
 * Parse long unix style CLI argument's
 *
 * @accept --key
 *         --key value
 *         --key=value
 */
 
void argumentLong (char *key, char *value) {
 
   if (strlen(key) <= 2) {
      fprintf(stderr, "Invalid CLI argument length (long)\n");
      exit(-1);
   }
 
   /**
    * Settings that do not require usage of value argument
    */
 
   if (strncmp(key, "--example", 9) == 0 && strlen(key) == 9 && value == NULL)
      printf("%s with no value, setting to default\n", key);
 
   /**
    * Check if we're dealing with --key=value if value is NULL
    */
 
   if (value == NULL) {
      if (strchr(key, '=') != NULL) {
         value = argumentGetValue(key);
         key = argumentGetKey(key);
      }
      else
         return;
   }
 
   if (strncmp(key, "--example", 6) == 0 && strlen(key) == 6)
      printf("%s %s\n", key, value);
}
 
/**
 * Extract key from -k=value or --key=value syntax
 */
 
char *argumentGetKey (char *key) {
 
   return strtok(key, "=");
}
 
/**
 * Extract value from -k=value or --key=value syntax
 */
 
char *argumentGetValue (char *key) {
 
   char *value;
 
   value = strtok(key, "=");
   value = strtok(NULL, "=");
 
   return value;
}

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