fixed echo, xargs

libmu/parse_escape.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+char *mu_parse_escape(const char *prog_name, const char *src) {
+	size_t size = 0;
+	size_t src_len = strlen(src);
+
+	for (size_t i = 0; i < src_len; i++) {
+		size++;
+		size -= (src[i] == '\\');
+	}
+
+	char *buf = malloc(size + 1);
+	if (buf == NULL) {
+		if (prog_name)
+			fprintf(stderr, "%s: malloc: %s\n", prog_name, strerror(errno));
+
+		return NULL;
+	}
+
+	size = 0;
+	for (size_t i = 0; i < src_len; i++) {
+		char c = src[i];
+		if (c == '\\' && i < src_len) {
+			switch (src[i + 1]) {
+				case 'n':
+					c = '\n';
+					break;
+
+				case 'a':
+					c = '\a';
+					break;
+
+				case 't':
+					c = '\t';
+					break;
+
+				case 'b':
+					c = '\b';
+					break;
+
+				case 'e':
+					c = '\033';
+					break;
+
+				case 'r':
+					c = '\r';
+					break;
+
+				case 'f':
+					c = '\f';
+					break;
+
+				case 'v':
+					c = '\v';
+					break;
+
+				default:
+					c = '\\';
+			}
+
+			i++;
+		}
+
+		buf[size] = c;
+		size++;
+	}
+
+	buf[size + 1] = '\0';
+	return buf;
+}

libmu/parse_escape.h

@@ -0,0 +1,5 @@
+#ifndef PARSE_ESCAPE_H
+#define PARSE_ESCAPE_H
+
+char *mu_parse_escape(const char *prog_name, const char *src);
+#endif