- if (!strchr(string, '"'))
- return NULL;
- string = strchr(string, '"') + 1;
- if (!strrchr(string, '"'))
- return NULL;
- *strrchr(string, '"') = '\0';
-
- for (i = 0; i < strlen(string); i++) {
- if (string[i] == '\\') {
- char repl;
- unsigned len = 0;
- const char *p = strchr(mapfrom, string[i+1]);
- if (p) {
- repl = mapto[p - mapfrom];
- len = 1;
- } else if (strlen(string+i+1) >= 3) {
- if (string[i+1] == 'x') {
- repl = (string[i+2]-'0')*16
- + string[i+3]-'0';
- len = 3;
- } else if (cisdigit(string[i+1])) {
- repl = (string[i+2]-'0')*8*8
- + (string[i+3]-'0')*8
- + (string[i+4]-'0');
- len = 3;
- }
- }
- if (len == 0) {
- repl = string[i+1];
- len = 1;
- }
-
- string[i] = repl;
- memmove(string + i + 1, string + i + len + 1,
- strlen(string + i + len + 1) + 1);
- }
- }
-
- return string;