Added carr_X_idx().

1 files changed, 18 insertions, 31 deletions

diff --git a/docs/coption_api.md b/docs/coption_api.md
index b7eebc43..be0d0978 100644
--- a/docs/coption_api.md
+++ b/docs/coption_api.md
@@ -39,46 +39,33 @@ int             coption_get(coption *opt, int argc, char *argv[],
 ## Example
 
 ```c
-#include <stc/coption.h>
 #include <stdio.h>
+#include <stc/coption.h>
 
 int main(int argc, char *argv[]) {
-    static coption_long long_options[] = {
-      {"verbose", coption_no_argument,       'V'},
-      {"help",    coption_no_argument,       'H'},
-      {"add",     coption_no_argument,       'a'},
-      {"append",  coption_no_argument,       'b'},
-      {"delete",  coption_required_argument, 'd'},
-      {"create",  coption_required_argument, 'c'},
-      {"file",    coption_required_argument, 'f'},
-      {NULL}
+    coption_long longopts[] = {
+        {"foo", coption_no_argument,       'f'},
+        {"bar", coption_required_argument, 'b'},
+        {"opt", coption_optional_argument, 'o'},
+        {0}
     };
+    const char* shortopts = "xy:z::123";
+    if (argc == 1) 
+        printf("Usage: program -x -y ARG -z [ARG] -1 -2 -3 --foo --bar ARG --opt [ARG] [ARGUMENTS]\n", argv[0]);
     coption opt = coption_init();
     int c;
-    while ((c = coption_get(&opt, argc, argv, ":if:lr", long_options)) != -1) {
+    while ((c = coption_get(&opt, argc, argv, shortopts, longopts)) != -1) {
         switch (c) {
-            case 'V': case 'H':
-            case 'a': case 'b':
-            case 'd': case 'c':
-            case 'i': case 'l':
-            case 'r':
-                printf("option: %c\n", c);
-                break;
-            case 'f':
-                printf("filename: %s\n", opt.arg);
-                break;
-            case ':':
-                printf("option %s needs a value\n", opt.optstr);
-                break;
-            case '?':
-                printf("unknown option: %s\n", opt.optstr);
-                break;
+            case '?': printf("error: unknown option: %s\n", opt.optstr); break;
+            case ':': printf("error: missing argument for %s\n", opt.optstr); break;
+            default:  printf("option: %c [%s]\n", opt.opt, opt.arg ? opt.arg : ""); break;
         }
     }
-
-    for (; opt.ind < argc; ++opt.ind) {
-        printf("extra arguments: %s\n", argv[opt.ind]);
-    }
+    printf("\nNon-option arguments:");
+    for (int i = opt.ind; i < argc; ++i)
+        printf(" %s", argv[i]);
+    putchar('\n');
+}
     return 0;
 }
 ```