Slightly better? I dunno.

bin/commands.h

@@ -1,18 +1,18 @@
 #ifndef _COMMANDS_H
 #define _COMMANDS_H
 
-void cammy_command_usage(int argc, char **argv, const char *message, ...);
+void cammy_usage(int argc, char **argv, const char *message, ...);
 
-void cammy_command_validate_photo_number(int argc, char **argv, int num);
+void cammy_validate_photo_number(int argc, char **argv, int num);
 
-int cammy_command_import(int argc, char **argv);
+int cammy_import(int argc, char **argv);
-int cammy_command_export(int argc, char **argv);
+int cammy_export(int argc, char **argv);
-int cammy_command_dither(int argc, char **argv);
+int cammy_dither(int argc, char **argv);
-int cammy_command_split_rgb(int argc, char **argv);
+int cammy_rgb_split(int argc, char **argv);
-int cammy_command_merge_rgb(int argc, char **argv);
+int cammy_rgb_merge(int argc, char **argv);
-int cammy_command_import_tile(int argc, char **argv);
+int cammy_tile_import(int argc, char **argv);
-int cammy_command_export_tile(int argc, char **argv);
+int cammy_tile_export(int argc, char **argv);
-int cammy_command_convert_tile(int argc, char **argv);
+int cammy_tile_convert(int argc, char **argv);
-int cammy_command_slice(int argc, char **argv);
+int cammy_slice(int argc, char **argv);
 
 #endif /* _COMMANDS_H */

bin/dither.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <stdarg.h>
+#include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -24,15 +24,30 @@ static cammy_tile_palette palette = {
     }
 };
 
-int cammy_command_dither(int argc, char **argv) {
+static void usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    fprintf(stderr, "usage: %1$s dither input.png output.png\n", argv[0]);
+
+    exit(1);
+}
+
+int cammy_dither(int argc, char **argv) {
     uint8_t *bufin, *bufout;
     size_t width, height;
     int depth;
 
     if (argc < 3) {
-        cammy_command_usage(argc, argv, "No PNG input file provided");
+        usage(argc, argv, "No PNG input file provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv, "No PNG output filename provided");
+        usage(argc, argv, "No PNG output filename provided");
     }
 
     if ((bufin = cammy_png_load(argv[2], &width,

bin/export.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <stdarg.h>
+#include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -24,23 +24,38 @@ static cammy_tile_palette palette = {
     }
 };
 
-int cammy_command_export(int argc, char **argv) {
+static void usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    fprintf(stderr, "usage: %1$s export file.sav 1..30 output.png\n", argv[0]);
+
+    exit(1);
+}
+
+int cammy_export(int argc, char **argv) {
     cammy_sram *sram;
     int photo = 0;
     uint8_t *buf;
 
     if (argc < 3) {
-        cammy_command_usage(argc, argv, "No save file provided");
+        usage(argc, argv, "No save file provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv, "No photo number provided");
+        usage(argc, argv, "No photo number provided");
     } else if (argc < 5) {
-        cammy_command_usage(argc, argv, "No output filename provided");
+        usage(argc, argv, "No output filename provided");
     }
 
     photo = atoi(argv[3]);
 
     if (photo < 1 || photo > CAMMY_SRAM_PHOTO_COUNT) {
-        cammy_command_usage(argc, argv, "Invalid photo number");
+        usage(argc, argv, "Invalid photo number");
     }
 
     if ((sram = cammy_sram_open(argv[2])) == NULL) {

bin/import.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 #include <string.h>
 #include <errno.h>
 
@@ -9,7 +10,22 @@
 #include "pnglite.h"
 #include "commands.h"
 
-int cammy_command_import(int argc, char **argv) {
+static void usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    fprintf(stderr, "usage: %1$s import file.sav 1..30 input.png\n", argv[0]);
+
+    exit(1);
+}
+
+int cammy_import(int argc, char **argv) {
     cammy_sram *sram;
     png_t *png;
     int photo = 0;
@@ -18,17 +34,17 @@ int cammy_command_import(int argc, char **argv) {
     int error;
 
     if (argc < 3) {
-        cammy_command_usage(argc, argv, "No save file provided");
+        usage(argc, argv, "No save file provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv, "No photo number provided");
+        usage(argc, argv, "No photo number provided");
     } else if (argc < 5) {
-        cammy_command_usage(argc, argv, "No photo provided");
+        usage(argc, argv, "No photo provided");
     }
 
     photo = atoi(argv[3]);
 
     if (photo < 1 || photo > CAMMY_SRAM_PHOTO_COUNT) {
-        cammy_command_usage(argc, argv, "Invalid photo number");
+        usage(argc, argv, "Invalid photo number");
     }
 
     if ((sram = cammy_sram_open(argv[2])) == NULL) {

bin/main.c

@@ -7,7 +7,25 @@
 
 #include "commands.h"
 
-void cammy_command_usage(int argc, char **argv, const char *message, ...) {
+static struct {
+    char *name;
+    int (*fun)(int, char **);
+} commands[] = {
+    { "import",       cammy_import       },
+    { "export",       cammy_export       },
+    { "dither",       cammy_dither       },
+    { "rgb-split",    cammy_rgb_split    },
+    { "rgb-merge",    cammy_rgb_merge    },
+    { "tile-import",  cammy_tile_import  },
+    { "tile-export",  cammy_tile_export  },
+    { "tile-convert", cammy_tile_convert },
+    { "slice",        cammy_slice        },
+    { NULL,           NULL               }
+};
+
+static void usage(int argc, char **argv, const char *message, ...) {
+    int i;
+
     if (message) {
         va_list args;
 
@@ -17,47 +35,36 @@ void cammy_command_usage(int argc, char **argv, const char *message, ...) {
          fprintf(stderr, "\n");
     }
 
-    fprintf(stderr, "usage: %1$s import       file.sav 1..30 input.png\n"
+    for (i=0; commands[i].name; i++) {
-                    "       %1$s export       file.sav 1..30 output.png\n"
+        if (i == 0) {
-                    "       %1$s dither       input.png output.png\n"
+            fprintf(stderr, "usage: %s %s\n", argv[0], commands[i].name);
-                    "       %1$s split-rgb    file.sav rn gn bn input.png\n"
+        } else {
-                    "       %1$s merge-rgb    file.sav rn gn bn output.png\n"
+            int x, len = strlen(argv[0]);
-                    "       %1$s import-tile  file.sav 1..30 printer.tile\n"
+
-                    "       %1$s export-tile  file.sav 1..30 output.tile\n"
+            fprintf(stderr, "       ");
-                    "       %1$s convert-tile printer.tile output.png\n"
+
-                    "       %1$s slice        x-pad y-pad input.png\n",
+            for (x=0; x<len; x++) {
-        argv[0]);
+                fprintf(stderr, " ");
+            }
+
+            fprintf(stderr, " %s ...\n", commands[i].name);
+        }
+    }
 
     exit(1);
 }
 
-void cammy_command_validate_photo_number(int argc, char **argv, int num) {
+void cammy_validate_photo_number(int argc, char **argv, int num) {
     if (num < 1 || num > CAMMY_SRAM_PHOTO_COUNT) {
-        cammy_command_usage(argc, argv, "Invalid photo number");
+        usage(argc, argv, "Invalid photo number");
     }
 }
 
-static struct {
-    char *name;
-    int (*fun)(int, char **);
-} commands[] = {
-    { "import",       cammy_command_import       },
-    { "export",       cammy_command_export       },
-    { "dither",       cammy_command_dither       },
-    { "split-rgb",    cammy_command_split_rgb    },
-    { "merge-rgb",    cammy_command_merge_rgb    },
-    { "import-tile",  cammy_command_import_tile  },
-    { "export-tile",  cammy_command_export_tile  },
-    { "convert-tile", cammy_command_convert_tile },
-    { "slice",        cammy_command_slice        },
-    { NULL,           NULL                       }
-};
-
 int main(int argc, char **argv) {
     int i;
 
     if (argc < 2) {
-        cammy_command_usage(argc, argv, "No command specified");
+        usage(argc, argv, "No command specified");
     }
 
     for (i=0; commands[i].name; i++) {
@@ -66,7 +73,7 @@ int main(int argc, char **argv) {
         }
     }
 
-    cammy_command_usage(argc, argv, "Unknown command '%s'", argv[1]);
+    usage(argc, argv, "Unknown command '%s'", argv[1]);
 
     return 0;
 }

bin/png.c

@@ -1,18 +1,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <stdarg.h>
 #include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
 
-#include <cammy/screen.h>
 #include <cammy/image.h>
-#include <cammy/screen.h>
-#include <cammy/photo.h>
-#include <cammy/sram.h>
 
 #include "pnglite.h"
 #include "png.h"

bin/rgb.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 #include <string.h>
 #include <errno.h>
 
@@ -10,7 +11,20 @@
 #include "pnglite.h"
 #include "commands.h"
 
-int cammy_command_split_rgb(int argc, char **argv) {
+static void split_usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    exit(1);
+}
+
+int cammy_rgb_split(int argc, char **argv) {
     cammy_sram *sram;
     png_t *png;
 
@@ -23,20 +37,20 @@ int cammy_command_split_rgb(int argc, char **argv) {
     int error;
 
     if (argc < 3) {
-        cammy_command_usage(argc, argv, "No save file provided");
+        split_usage(argc, argv, "No save file provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv, "No red photo number provided");
+        split_usage(argc, argv, "No red photo number provided");
     } else if (argc < 5) {
-        cammy_command_usage(argc, argv, "No green photo number provided");
+        split_usage(argc, argv, "No green photo number provided");
     } else if (argc < 6) {
-        cammy_command_usage(argc, argv, "No blue photo number provided");
+        split_usage(argc, argv, "No blue photo number provided");
     } else if (argc < 7) {
-        cammy_command_usage(argc, argv, "No photo provided");
+        split_usage(argc, argv, "No photo provided");
     }
 
-    cammy_command_validate_photo_number(argc, argv, photo_r = atoi(argv[3]));
+    cammy_validate_photo_number(argc, argv, photo_r = atoi(argv[3]));
-    cammy_command_validate_photo_number(argc, argv, photo_g = atoi(argv[4]));
+    cammy_validate_photo_number(argc, argv, photo_g = atoi(argv[4]));
-    cammy_command_validate_photo_number(argc, argv, photo_b = atoi(argv[5]));
+    cammy_validate_photo_number(argc, argv, photo_b = atoi(argv[5]));
 
     if ((sram = cammy_sram_open(argv[2])) == NULL) {
         fprintf(stderr, "%s: %s: %s: %s\n",
@@ -111,7 +125,23 @@ error_sram_open:
     return 1;
 }
 
-int cammy_command_merge_rgb(int argc, char **argv) {
+static void merge_usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    fprintf(stderr, "usage: %1$s rgb-merge file.sav rn gn bn output.png\n",
+        argv[0]);
+
+    exit(1);
+}
+
+int cammy_rgb_merge(int argc, char **argv) {
     cammy_sram *sram;
     png_t *png;
 
@@ -124,20 +154,20 @@ int cammy_command_merge_rgb(int argc, char **argv) {
     int error;
 
     if (argc < 3) {
-        cammy_command_usage(argc, argv, "No save file provided");
+        merge_usage(argc, argv, "No save file provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv, "No red photo number provided");
+        merge_usage(argc, argv, "No red photo number provided");
     } else if (argc < 5) {
-        cammy_command_usage(argc, argv, "No green photo number provided");
+        merge_usage(argc, argv, "No green photo number provided");
     } else if (argc < 6) {
-        cammy_command_usage(argc, argv, "No blue photo number provided");
+        merge_usage(argc, argv, "No blue photo number provided");
     } else if (argc < 7) {
-        cammy_command_usage(argc, argv, "No photo provided");
+        merge_usage(argc, argv, "No photo provided");
     }
 
-    cammy_command_validate_photo_number(argc, argv, photo_r = atoi(argv[3]));
+    cammy_validate_photo_number(argc, argv, photo_r = atoi(argv[3]));
-    cammy_command_validate_photo_number(argc, argv, photo_g = atoi(argv[4]));
+    cammy_validate_photo_number(argc, argv, photo_g = atoi(argv[4]));
-    cammy_command_validate_photo_number(argc, argv, photo_b = atoi(argv[5]));
+    cammy_validate_photo_number(argc, argv, photo_b = atoi(argv[5]));
 
     if ((sram = cammy_sram_open(argv[2])) == NULL) {
         fprintf(stderr, "%s: %s: %s: %s\n",

bin/slice.c

@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <stdarg.h>
+#include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -13,7 +13,22 @@
 #include "png.h"
 #include "commands.h"
 
-int cammy_command_slice(int argc, char **argv) {
+static void usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    fprintf(stderr, "usage: %1$s slice x-pad y-pad input.png\n", argv[0]);
+
+    exit(1);
+}
+
+int cammy_slice(int argc, char **argv) {
     uint8_t *buf;
 
     size_t width, height,
@@ -22,11 +37,11 @@ int cammy_command_slice(int argc, char **argv) {
     int depth;
 
     if (argc < 3) {
-        cammy_command_usage(argc, argv, "No X padding provided");
+        usage(argc, argv, "No X padding provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv, "No Y padding provided");
+        usage(argc, argv, "No Y padding provided");
     } else if (argc < 5) {
-        cammy_command_usage(argc, argv, "No input PNG image provided");
+        usage(argc, argv, "No input PNG image provided");
     }
 
     x_pad = atoi(argv[2]);

bin/tile.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -25,24 +26,42 @@ static cammy_tile_palette palette = {
     }
 };
 
-int cammy_command_import_tile(int argc, char **argv) {
+static void import_usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    fprintf(stderr, "usage: %1$s tile-import  file.sav 1..30 printer.tile\n"
+                    "       %1$s tile-export  file.sav 1..30 output.tile\n"
+                    "       %1$s tile-convert printer.tile output.png\n",
+        argv[0]);
+
+    exit(1);
+}
+
+int cammy_tile_import(int argc, char **argv) {
     cammy_sram *sram;
     cammy_image *dest, *src;
     int photo;
 
     if (argc < 2) {
-        cammy_command_usage(argc, argv, "No camera SRAM file provided");
+        import_usage(argc, argv, "No camera SRAM file provided");
     } else if (argc < 3) {
-        cammy_command_usage(argc, argv, "No picture number provided");
+        import_usage(argc, argv, "No picture number provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv,
+        import_usage(argc, argv,
             "No Game Boy screen tile data file provided");
     }
 
     photo = atoi(argv[3]);
 
     if (photo < 1 || photo > CAMMY_SRAM_PHOTO_COUNT) {
-        cammy_command_usage(argc, argv, "Invalid photo number");
+        import_usage(argc, argv, "Invalid photo number");
     }
 
     if ((sram = cammy_sram_open(argv[2])) == NULL) {
@@ -90,24 +109,42 @@ error_sram_open:
     return 1;
 }
 
-int cammy_command_export_tile(int argc, char **argv) {
+static void export_usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    fprintf(stderr, "usage: %1$s tile-import  file.sav 1..30 printer.tile\n"
+                    "       %1$s tile-export  file.sav 1..30 output.tile\n"
+                    "       %1$s tile-convert printer.tile output.png\n",
+        argv[0]);
+
+    exit(1);
+}
+
+int cammy_tile_export(int argc, char **argv) {
     cammy_sram *sram;
     cammy_image *dest, *src;
     int photo;
 
     if (argc < 2) {
-        cammy_command_usage(argc, argv, "No camera SRAM file provided");
+        export_usage(argc, argv, "No camera SRAM file provided");
     } else if (argc < 3) {
-        cammy_command_usage(argc, argv, "No picture number provided");
+        export_usage(argc, argv, "No picture number provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv,
+        export_usage(argc, argv,
             "No Game Boy screen tile data file provided");
     }
 
     photo = atoi(argv[3]);
 
     if (photo < 1 || photo > CAMMY_SRAM_PHOTO_COUNT) {
-        cammy_command_usage(argc, argv, "Invalid photo number");
+        export_usage(argc, argv, "Invalid photo number");
     }
 
     if ((sram = cammy_sram_open(argv[2])) == NULL) {
@@ -172,15 +209,31 @@ error_sram_open:
     return errno || 1;
 }
 
-int cammy_command_convert_tile(int argc, char **argv) {
+static void convert_usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+        va_end(args);
+         fprintf(stderr, "\n");
+    }
+
+    fprintf(stderr, "usage: %1$s tile-convert printer.tile output.png\n",
+        argv[0]);
+
+    exit(1);
+}
+
+int cammy_tile_convert(int argc, char **argv) {
     int fd;
     void *in, *out;
 
     if (argc < 3) {
-        cammy_command_usage(argc, argv,
+        convert_usage(argc, argv,
             "No input Game Boy screen tile data file provided");
     } else if (argc < 4) {
-        cammy_command_usage(argc, argv, "No output PNG filename provided");
+        convert_usage(argc, argv, "No output PNG filename provided");
     }
 
     if ((fd = open(argv[2], O_RDONLY)) < 0) {