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-rw-r--r--src/misc.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/misc.c b/src/misc.c
index bfdf2820..0f1a7d49 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -1692,4 +1692,47 @@ error:
return SSH_ERROR;
}
+/**
+ * @internal
+ *
+ * @brief Given a string, encode existing newlines as the string "\\n"
+ *
+ * @param[in] string Input string
+ * @param[out] buf Output buffer. This buffer must be at least (2 *
+ * strlen(string)) + 1 long. In the worst case,
+ * each character can be encoded as 2 characters plus the
+ * terminating '\0'.
+ * @param[in] buf_len Size of the provided output buffer
+ *
+ * @returns SSH_ERROR on error; length of the resulting string not counting the
+ * terminating '\0' otherwise
+ */
+int ssh_newline_vis(const char *string, char *buf, size_t buf_len)
+{
+ const char *in = NULL;
+ char *out = NULL;
+
+ if (string == NULL || buf == NULL || buf_len == 0) {
+ return SSH_ERROR;
+ }
+
+ if ((2 * strlen(string) + 1) > buf_len) {
+ SSH_LOG(SSH_LOG_WARNING, "Buffer too small");
+ return SSH_ERROR;
+ }
+
+ out = buf;
+ for (in = string; *in != '\0'; in++) {
+ if (*in == '\n') {
+ *out++ = '\\';
+ *out++ = 'n';
+ } else {
+ *out++ = *in;
+ }
+ }
+ *out = '\0';
+
+ return out - buf;
+}
+
/** @} */