1 files changed, 66 insertions, 0 deletions
diff --git a/libbb/fgets_str.c b/libbb/fgets_str.c
new file mode 100644
index 0000000..8026a15
--- /dev/null
+++ b/libbb/fgets_str.c
@@ -0,0 +1,66 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) many different people.
+ * If you wrote this, please acknowledge your work.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off)
+{
+	char *linebuf = NULL;
+	const int term_length = strlen(terminating_string);
+	int end_string_offset;
+	int linebufsz = 0;
+	int idx = 0;
+	int ch;
+
+	while (1) {
+		ch = fgetc(file);
+		if (ch == EOF) {
+			if (idx == 0)
+				return linebuf; /* NULL */
+			break;
+		}
+
+		if (idx >= linebufsz) {
+			linebufsz += 200;
+			linebuf = xrealloc(linebuf, linebufsz);
+		}
+
+		linebuf[idx] = ch;
+		idx++;
+
+		/* Check for terminating string */
+		end_string_offset = idx - term_length;
+		if (end_string_offset >= 0
+		 && memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0
+		) {
+			if (chop_off)
+				idx -= term_length;
+			break;
+		}
+	}
+	/* Grow/shrink *first*, then store NUL */
+	linebuf = xrealloc(linebuf, idx + 1);
+	linebuf[idx] = '\0';
+	return linebuf;
+}
+
+/* Read up to TERMINATING_STRING from FILE and return it,
+ * including terminating string.
+ * Non-terminated string can be returned if EOF is reached.
+ * Return NULL if EOF is reached immediately.  */
+char* FAST_FUNC xmalloc_fgets_str(FILE *file, const char *terminating_string)
+{
+	return xmalloc_fgets_internal(file, terminating_string, 0);
+}
+
+char* FAST_FUNC xmalloc_fgetline_str(FILE *file, const char *terminating_string)
+{
+	return xmalloc_fgets_internal(file, terminating_string, 1);
+}