Parsing commandline arguments

ulib/args/args.c

@@ -0,0 +1,32 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <args/args.h>
+#include <string/conv.h>
+#include <string/string.h>
+#include <uprintf.h>
+
+int32_t parse_args(char **argv, size_t argc, Arg *defs) {
+  for (size_t i = 0; i < argc; i++) {
+    if (argv[i][0] == '-' && argv[i][1] != '\0') {
+      char *optname = argv[i];
+      size_t j = 0;
+      while (!defs[j].end) {
+        Arg *def = &defs[j];
+        if (string_strcmp(def->shortname, optname) == 0) {
+          if (i < argc - 1) {
+            switch (def->expected_value) {
+              case ARG_STRING:
+                *((char **)def->ptr) = argv[i+1];
+                break;
+            }
+            i++;
+          }
+        }
+        j++;
+      }
+    }
+  }
+
+  return ARGP_OK;
+}

ulib/args/args.h

@@ -0,0 +1,33 @@
+#ifndef ULIB_ARGS_H_
+#define ULIB_ARGS_H_
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+char **args(void);
+size_t argslen(void);
+
+typedef struct {
+  char *shortname;
+  enum { ARG_STRING } expected_value;
+  void *ptr;
+  bool end;
+} Arg;
+
+#define ARG(sn, ev, p) ((Arg){ \
+    .shortname = (sn), \
+    .expected_value = (ev), \
+    .ptr = (void *)(p), \
+    .end = false, \
+  })
+
+#define ARG_END() ((Arg){ .end = true, })
+
+enum {
+  ARGP_OK = 0,
+};
+
+int32_t parse_args(char **argv, size_t argc, Arg *defs);
+
+#endif // ULIB_ARGS_H_