(program_name, help): New.

[empserver] / src / util / fairland.c

diff --git a/src/util/fairland.c b/src/util/fairland.c
index 83d62af0f149e13212e75503197da31763e048c4..e4b80ffda3121c0ea77f60f8236e79b17882635f 100644 (file)
--- a/src/util/fairland.c
+++ b/src/util/fairland.c
@@ -102,6 +102,8 @@ static int AIRPORT_MARKER = 0;
    1 = don't merge, 0 = merge. */
 static int DISTINCT_ISLANDS = 1;
 
+static char *program_name;
+
 #define XSIZE           ((WORLD_X) / 2)        /* basically world x-y size */
 #define YSIZE           (WORLD_Y)
 #define STABLE_CYCLE 4         /* stability required for perterbed capitals */
@@ -158,6 +160,8 @@ int fl_status;                      /* is anything wrong? */
 const char *numletter =
     "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
 
+static void help(char *);
+static void usage(void);
 static void parse_args(int argc, char *argv[]);
 static int allocate_memory(void);
 static void init(void);
@@ -191,9 +195,10 @@ main(int argc, char *argv[])
     char *config_file = NULL;
     int i = 0;
 
+    program_name = argv[0];
     rnd_seed = time(NULL);
 
-    while ((opt = getopt(argc, argv, "ae:ioqs:R:")) != EOF) {
+    while ((opt = getopt(argc, argv, "ae:hioqs:R:")) != EOF) {
        switch (opt) {
        case 'a':
            AIRPORT_MARKER = 1;
@@ -216,6 +221,12 @@ main(int argc, char *argv[])
        case 'R':
            rnd_seed = strtoul(optarg, NULL, 10);
            break;
+       case 'h':
+           usage();
+           return 0;
+       default:
+           help(NULL);
+           exit(1);
        }
     }
     srandom(rnd_seed);
@@ -293,29 +304,47 @@ my_sqrt(int n)
   PARSE COMMAND LINE ARGUMENTS
 ****************************************************************************/
 
+static void
+help(char *complaint)
+{
+    if (complaint)
+       fprintf(stderr, "%s: %s\n", program_name, complaint);
+    fprintf(stderr, "Try -h for help.\n");
+}
+
+static void
+usage(void)
+{
+    printf("Usage: %s [-e CONFIG] [-aiqo] [-s SCRIPT] [-R SEED] NC SC [NI] [IS] [SP] [PM] [DI] [ID]\n"
+          "  -q            quiet\n"
+          "  -o            don't set resources\n"
+          "  -a            airport marker for continents\n"
+          "  -i            islands may merge\n"
+          "  -R SEED       seed for random number generator\n"
+          "  -e CONFIG     configuration file\n"
+          "  -s SCRIPT     name of script to create (default %s)\n"
+          "  NC            number of continents\n"
+          "  SC            continent size\n"
+          "  NI            number of islands (default NC)\n"
+          "  IS            average island size (default SC/2)\n"
+          "  SP            spike percentage: 0 = round, 100 = snake\n"
+          "                (default = %d)\n"
+          "  PM            percentage of land that is mountain (default %d)\n"
+          "  DI            minimum distance between continents (default %d)\n"
+          "  ID            minimum distance from islands to continents (default %d)\n",
+          program_name, DEFAULT_OUTFILE_NAME,
+          DEFAULT_SPIKE, DEFAULT_MOUNTAIN, DEFAULT_CONTDIST, DEFAULT_ISLDIST);
+}
+
 static void
 parse_args(int argc, char *argv[])
 {
-    if (argc < 2 || argc > 8) {
-       puts("fairland syntax:\n");
-       puts("fairland [-e config] [-aiqo] [-s script] [-R seed] <nc> <sc> [<ni>] [<is>] [<sp>] [<pm>] [<di>] [<id>]");
-       puts("-q = quiet, -o = no ore produced");
-       puts("-a = Airport marker for continents, -i = islands not distinct");
-       puts("-R = seed to use for random, -e = read config file");
-       printf("-s = name of script (default = %s)\n",
-              DEFAULT_OUTFILE_NAME);
-       puts("nc = number of continents [MANDATORY]");
-       puts("sc = continent size [MANDATORY]");
-       puts("ni = number of islands (default = nc)");
-       puts("is = average size of islands (default = sc/2)");
-       printf("sp = spike percentage: 0 = round, 100 = snake (default = %d)\n",
-              DEFAULT_SPIKE);
-       printf("pm = the percentage of land that is mountain (default = %d)\n",
-              DEFAULT_MOUNTAIN);
-       printf("di = the minimum distance between continents (default = %d)\n",
-              DEFAULT_CONTDIST);
-       printf("id = minimum distance from islands to continents (default = %d)\n",
-              DEFAULT_ISLDIST);
+    if (argc < 2) {
+       help("missing arguments");
+       exit(1);
+    }
+    if (argc > 8) {
+       help("too many arguments");
        exit(1);
     }
     nc = atoi(argv[0]);