1 files changed, 114 insertions, 0 deletions
diff --git a/utils/StringEscape.c b/utils/StringEscape.c
new file mode 100644
index 000000000..be5ec55c3
--- /dev/null
+++ b/utils/StringEscape.c
@@ -0,0 +1,114 @@
+#include <stddef.h>
+
+//FIXME out gets silently truncated if outsize is too small
+
+size_t escape(char* in, char* out, size_t outsize) {
+	size_t l = 0;
+	while(*in && l + 3 < outsize) {
+		switch(*in) {
+			case '\n':
+				*out++ = '\\';
+				l++;
+				*out = 'n';
+				break;
+			case '\r':
+				*out++ = '\\';
+				l++;
+				*out = 'r';
+				break;
+			case '\t':
+				*out++ = '\\';
+				l++;
+				*out = 't';
+				break;
+			case '\\':
+				*out++ = '\\';
+				l++;
+				*out = '\\';
+				break;
+			case '"':
+				*out++ = '\\';
+				l++;
+				*out = '"';
+				break;
+			case '\v':
+				*out++ = '\\';
+				l++;
+				*out = '\v';
+				break;
+			case '\?':
+				*out++ = '\\';
+				l++;
+				*out = '\?';
+				break;
+			case '\f':
+				*out++ = '\\';
+				l++;
+				*out = '\f';
+				break;
+			default:
+				*out = *in;
+		}
+		in++;
+		out++;
+		l++;
+	}
+	*out = 0;
+	return l;
+}
+#include <assert.h>
+#include <stdlib.h>
+size_t unescape(char* in, char *out, size_t outsize) {
+	size_t l = 0;
+	while(*in && l + 2 < outsize) {
+		switch (*in) {
+			case '\\':
+				++in;
+				assert(*in);
+				switch(*in) {
+					case 'n':
+						*out='\n';
+						break;
+					case 'r':
+						*out='\r';
+						break;
+					case 't':
+						*out='\t';
+						break;
+					case '\\':
+						*out='\\';
+						break;
+					case '"':
+						*out='"';
+						break;
+					case 'v':
+						*out='\v';
+						break;
+					case '\?':
+						*out = '\?';
+						break;
+					case 'f':
+						*out = '\f';
+						break;
+					case '\'':
+						*out = '\'';
+						break;
+					case 'b':
+						*out = '\b';
+						break;
+					// FIXME add handling of hex and octal
+					default:
+						abort();
+				}
+				break;
+			default:
+				*out=*in;
+		}
+		in++;
+		out++;
+		l++;
+	}
+	*out = 0;
+	return l;
+}
+