1 files changed, 72 insertions, 0 deletions
diff --git a/text-common.c b/text-common.c
new file mode 100644
index 0000000..6225dad
--- /dev/null
+++ b/text-common.c
@@ -0,0 +1,72 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "text.h"
+
+static bool text_vprintf(Text *txt, size_t pos, const char *format, va_list ap) {
+	va_list ap_save;
+	va_copy(ap_save, ap);
+	int len = vsnprintf(NULL, 0, format, ap);
+	if (len == -1) {
+		va_end(ap_save);
+		return false;
+	}
+	char *buf = malloc(len+1);
+	bool ret = buf && (vsnprintf(buf, len+1, format, ap_save) == len) && text_insert(txt, pos, buf, len);
+	free(buf);
+	va_end(ap_save);
+	return ret;
+}
+
+bool text_appendf(Text *txt, const char *format, ...) {
+	va_list ap;
+	va_start(ap, format);
+	bool ret = text_vprintf(txt, text_size(txt), format, ap);
+	va_end(ap);
+	return ret;
+}
+
+bool text_printf(Text *txt, size_t pos, const char *format, ...) {
+	va_list ap;
+	va_start(ap, format);
+	bool ret = text_vprintf(txt, pos, format, ap);
+	va_end(ap);
+	return ret;
+}
+
+bool text_byte_get(const Text *txt, size_t pos, char *byte) {
+	return text_bytes_get(txt, pos, 1, byte);
+}
+
+size_t text_bytes_get(const Text *txt, size_t pos, size_t len, char *buf) {
+	if (!buf)
+		return 0;
+	char *cur = buf;
+	size_t rem = len;
+	for (Iterator it = text_iterator_get(txt, pos);
+	     text_iterator_valid(&it);
+	     text_iterator_next(&it)) {
+		if (rem == 0)
+			break;
+		size_t piece_len = it.end - it.text;
+		if (piece_len > rem)
+			piece_len = rem;
+		if (piece_len) {
+			memcpy(cur, it.text, piece_len);
+			cur += piece_len;
+			rem -= piece_len;
+		}
+	}
+	return len - rem;
+}
+
+char *text_bytes_alloc0(const Text *txt, size_t pos, size_t len) {
+	if (len == SIZE_MAX)
+		return NULL;
+	char *buf = malloc(len+1);
+	if (!buf)
+		return NULL;
+	len = text_bytes_get(txt, pos, len, buf);
+	buf[len] = '\0';
+	return buf;
+}