initial commit

src/api.c

@@ -0,0 +1,120 @@
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ds.h"
+#include "log.h"
+
+#include "api.h"
+
+ds_sll_t *subcmds;
+
+int
+register_subcmd(char *name, void (*cb)(void *, int argc, char *argv[]), void *data)
+{
+	char *c;
+  ds_sll_t *newnode = calloc(1, sizeof(ds_sll_t));
+  wom_subcmd_t *newsubcmd = calloc(1, sizeof(wom_subcmd_t));
+
+	/* make sure the subcmd name doesn't contain a space */
+	for (c = name; *c != '\0'; c++) {
+		if (isspace(*c)) {
+			log_fatal("subcmd '%s' can't contain any whitespace characters", name);
+			return 1;
+		}
+	}
+
+  /* setup data */
+  newsubcmd->name = name;
+  newsubcmd->cb = cb;
+  newsubcmd->data = data;
+  newnode->data = newsubcmd;
+  newnode->next = NULL;
+
+  /* if this is the first node */
+  if (!subcmds) {
+    subcmds = newnode;
+    return 0;
+  }
+
+  /* otherwise append the node to the end of the current nodes */
+	ds_ll_foreach(ds_sll_t, subcmds) {
+    if (!cur->next) {
+      cur->next = newnode;
+      break;
+    }
+	}
+
+  return 0;
+}
+
+char
+**list_subcmds(void)
+{
+  int i;
+  char **subcmdp;
+  ds_sll_t *node;
+  wom_subcmd_t *subcmd;
+
+  /* get the number of elements in the linked list */
+  /* TEST: for some reason we need to allocate an extra space in the array or
+   * else */
+  for (i = 1, node = subcmds; node; node = node->next, i++)
+    ;
+
+  subcmdp = calloc(i, sizeof(char *));
+
+  for (i = 0, node = subcmds; node; node = node->next, i++) {
+    subcmd = node->data;
+    if (subcmd->name) {
+      subcmdp[i] = subcmd->name;
+    }
+  }
+
+  return subcmdp;
+}
+
+void
+run_subcmds(int argc, char *argv[])
+{
+  int i, j;
+  char **args;
+  wom_subcmd_t *subcmd;
+
+  /* check for subcommands to run */
+  for (i = 1; i < argc; i++) {
+		ds_ll_foreach(ds_sll_t, subcmds) {
+      subcmd = cur->data;
+      if (strcmp(argv[i], subcmd->name) == 0) {
+        goto args;
+      }
+		}
+  }
+
+  return;
+args:
+  args = calloc(argc - i, sizeof(char *));
+  for (j = 0; i < argc; i++, j++) {
+    args[j] = argv[i];
+  }
+
+  subcmd->cb(subcmd->data, j, args);
+  free(args);
+}
+
+int
+cleanup_subcmds(void)
+{
+  ds_sll_t *prevnode, *node;
+
+  for (node = subcmds; node;) {
+    free(node->data);
+    prevnode = node;
+    node = node->next;
+    free(prevnode);
+  }
+
+  free(node);
+
+  return 0;
+}