Minor code improvements and split into multiple c files

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 67 insertions, 0 deletions

diff --git a/libcoopgamma_get_methods.c b/libcoopgamma_get_methods.c
new file mode 100644
index 0000000..2761bd1
--- /dev/null
+++ b/libcoopgamma_get_methods.c
@@ -0,0 +1,67 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * List all recognised adjustment method
+ * 
+ * SIGCHLD must not be ignored or blocked
+ * 
+ * @return  A `NULL`-terminated list of names. You should only free
+ *          the outer pointer, inner pointers are subpointers of the
+ *          outer pointer and cannot be freed. `NULL` on error.
+ */
+char **
+libcoopgamma_get_methods(void)
+{
+	char num[5]; /* The size is base on the fact that we have limited `n` in the loop below */
+	char **methods = NULL;
+	char *method;
+	char **rc;
+	char *buffer;
+	size_t n = 0;
+	size_t size = 0;
+	void *new;
+
+	methods = malloc(4U * sizeof(*methods));
+	if (!methods)
+		goto fail;
+
+	for (n = 0; n < 10000 /* just to be safe */; n++) {
+		if (n >= 4 && (n & (~n + 1U)) == n) {
+			new = realloc(methods, (n << 1) * sizeof(*methods));
+			if (!new)
+				goto fail;
+			methods = new;
+		}
+		sprintf(num, "%zu", n);
+		if (libcoopgamma_get_method_and_site(num, NULL, &method, NULL))
+			goto fail;
+		if (!strcmp(method, num)) {
+			free(method);
+			break;
+		}
+		methods[n] = method;
+		size += strlen(method) + 1U;
+	}
+
+	rc = malloc((n + 1U) * sizeof(char *) + size);
+	if (!rc)
+		goto fail;
+	buffer = (char *)&rc[n + 1U];
+	rc[n] = NULL;
+	while (n--) {
+		rc[n] = buffer;
+		buffer = &stpcpy(buffer, methods[n])[1U];
+		free(methods[n]);
+	}
+	free(methods);
+
+	return rc;
+
+fail:
+	while (n--)
+		free(methods[n]);
+	free(methods);
+	return NULL;
+}