1 files changed, 42 insertions, 0 deletions
diff --git a/strbuf.c b/strbuf.c
new file mode 100644
index 0000000000..7f14b0fb59
--- /dev/null
+++ b/strbuf.c
@@ -0,0 +1,42 @@
+#include "cache.h"
+#include "strbuf.h"
+
+void strbuf_init(struct strbuf *sb) {
+	sb->buf = NULL;
+	sb->eof = sb->alloc = sb->len = 0;
+}
+
+static void strbuf_begin(struct strbuf *sb) {
+	free(sb->buf);
+	strbuf_init(sb);
+}
+
+static void inline strbuf_add(struct strbuf *sb, int ch) {
+	if (sb->alloc <= sb->len) {
+		sb->alloc = sb->alloc * 3 / 2 + 16;
+		sb->buf = xrealloc(sb->buf, sb->alloc);
+	}
+	sb->buf[sb->len++] = ch;
+}
+
+static void strbuf_end(struct strbuf *sb) {
+	strbuf_add(sb, 0);
+}
+
+void read_line(struct strbuf *sb, FILE *fp, int term) {
+	int ch;
+	strbuf_begin(sb);
+	if (feof(fp)) {
+		sb->eof = 1;
+		return;
+	}
+	while ((ch = fgetc(fp)) != EOF) {
+		if (ch == term)
+			break;
+		strbuf_add(sb, ch);
+	}
+	if (ch == EOF && sb->len == 0)
+		sb->eof = 1;
+	strbuf_end(sb);
+}
+