1 files changed, 78 insertions, 0 deletions
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..a2c6c18
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,78 @@
+#include "internal.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void cepis_buf_init(cepis_buf_t *buf)
+{
+        buf->data = NULL;
+        buf->len = 0;
+        buf->cap = 0;
+}
+
+bool cepis_buf_append(cepis_buf_t *buf, const char *data, size_t len)
+{
+        if (buf->len + len + 1 > buf->cap) {
+                size_t cap = buf->cap ? buf->cap : 256;
+                char *grown;
+                while (buf->len + len + 1 > cap) {
+                        if (cap > (size_t)-1 / 2)
+                                return false;
+                        cap *= 2;
+                }
+                grown = realloc(buf->data, cap);
+                if (grown == NULL)
+                        return false;
+                buf->data = grown;
+                buf->cap = cap;
+        }
+        if (len > 0)
+                memcpy(buf->data + buf->len, data, len);
+        buf->len += len;
+        buf->data[buf->len] = '\0';
+        return true;
+}
+
+bool cepis_buf_append_str(cepis_buf_t *buf, const char *text)
+{
+        return cepis_buf_append(buf, text, strlen(text));
+}
+
+void cepis_buf_free(cepis_buf_t *buf)
+{
+        free(buf->data);
+        cepis_buf_init(buf);
+}
+
+char *cepis_strdup(const char *text)
+{
+        size_t len;
+        char *copy;
+
+        if (text == NULL)
+                text = "";
+        len = strlen(text);
+        copy = malloc(len + 1);
+        if (copy == NULL)
+                return NULL;
+        memcpy(copy, text, len + 1);
+        return copy;
+}
+
+cepis_status_t cepis_set_error(cepis_error_t *err, cepis_status_t status,
+                               long http_status, double retry_after,
+                               const char *fmt, ...)
+{
+        va_list args;
+
+        if (err == NULL)
+                return status;
+        err->status = status;
+        err->http_status = http_status;
+        err->retry_after = retry_after;
+        va_start(args, fmt);
+        vsnprintf(err->message, sizeof(err->message), fmt, args);
+        va_end(args);
+        return status;
+}