libactivity: (tmp name) http request parse

the parse works via callbacks, registered to a method and path. further
work will be done to simplify extraction of path, and to make the
request struct more private.

missing the parsing and handling of reponses.

Signed-off-by: Anna (navi) Figueiredo Gomes <navi@vlhl.dev>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/buffer.c b/src/buffer.c
new file mode 100644
index 0000000..0759f5d
--- /dev/null
+++ b/src/buffer.c
@@ -0,0 +1,81 @@
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "buffer.h"
+#include "util.h"
+
+static void buf_realloc(struct buffer *buf, size_t new_size) {
+	if (new_size > buf->size) {
+		buf->size = new_size + 1;
+		buf->data = realloc(buf->data, buf->size);
+	}
+}
+
+struct buffer *buf_new(const char *init) {
+	struct buffer *buf = malloc(sizeof(struct buffer));
+	if (init) {
+		buf->data = strdup(init);
+		buf->len = strlen(init);
+		buf->size = buf->len + 1;
+	} else {
+		buf->size = 1024;
+		buf->data = malloc(buf->size);
+		*buf->data = '\0';
+		buf->len = 0;
+	}
+
+	return buf;
+}
+
+void buf_del(struct buffer **buf) {
+	assert(*buf);
+	struct buffer *tmp = *buf;
+	free(tmp->data);
+	free(tmp);
+	*buf = NULL;
+}
+
+struct buffer *buf_dup(struct buffer *src) {
+	struct buffer *dest = malloc(sizeof(struct buffer));
+	dest->len = src->len;
+	dest->size = src->size;
+	dest->data = malloc(dest->size);
+	memcpy(dest->data, src->data, dest->size);
+	return dest;
+}
+
+char *buf_strdup(struct buffer *buf) {
+	return strdup(buf->data);
+}
+
+void buf_append(struct buffer *buf, const char *str) {
+	size_t len = strlen(str);
+	buf_realloc(buf, buf->len + len + 1);
+	strncat(buf->data, str, buf->size);
+}
+
+void buf_printf(struct buffer *buf, char *fmt, ...) {
+	va_list ap;
+	size_t len;
+
+	va_start(ap, fmt);
+	len = vsnprintf(buf->data, buf->size, fmt, ap);
+	va_end(ap);
+
+	if (len >= buf->size) {
+		buf_realloc(buf, len + 1);
+		va_start(ap, fmt);
+		len = vsnprintf(buf->data, buf->size, fmt, ap);
+		va_end(ap);
+	}
+
+	if (len < 0 || len >= buf->size) {
+		fprintf(stderr, "buf_printf: failed to format str");
+		exit(EXIT_FAILURE);
+	}
+
+	buf->len = len;
+}