* a'b ==> a'\''b ==> 'a'\''b'
* a!b ==> a'\!'b ==> 'a'\!'b'
*/
+#undef EMIT
#define EMIT(x) ( (++len < n) && (*bp++ = (x)) )
+static inline int need_bs_quote(char c)
+{
+ return (c == '\'' || c == '!');
+}
+
size_t sq_quote_buf(char *dst, size_t n, const char *src)
{
char c;
EMIT('\'');
while ((c = *src++)) {
- if (c == '\'' || c == '!') {
+ if (need_bs_quote(c)) {
EMIT('\'');
EMIT('\\');
EMIT(c);
return buf;
}
+char *sq_dequote(char *arg)
+{
+ char *dst = arg;
+ char *src = arg;
+ char c;
+
+ if (*src != '\'')
+ return NULL;
+ for (;;) {
+ c = *++src;
+ if (!c)
+ return NULL;
+ if (c != '\'') {
+ *dst++ = c;
+ continue;
+ }
+ /* We stepped out of sq */
+ switch (*++src) {
+ case '\0':
+ *dst = 0;
+ return arg;
+ case '\\':
+ c = *++src;
+ if (need_bs_quote(c) && *++src == '\'') {
+ *dst++ = c;
+ continue;
+ }
+ /* Fallthrough */
+ default:
+ return NULL;
+ }
+ }
+}
+
+/*
+ * C-style name quoting.
+ *
+ * Does one of three things:
+ *
+ * (1) if outbuf and outfp are both NULL, inspect the input name and
+ * counts the number of bytes that are needed to hold c_style
+ * quoted version of name, counting the double quotes around
+ * it but not terminating NUL, and returns it. However, if name
+ * does not need c_style quoting, it returns 0.
+ *
+ * (2) if outbuf is not NULL, it must point at a buffer large enough
+ * to hold the c_style quoted version of name, enclosing double
+ * quotes, and terminating NUL. Fills outbuf with c_style quoted
+ * version of name enclosed in double-quote pair. Return value
+ * is undefined.
+ *
+ * (3) if outfp is not NULL, outputs c_style quoted version of name,
+ * but not enclosed in double-quote pair. Return value is undefined.
+ */
+
+static int quote_c_style_counted(const char *name, int namelen,
+ char *outbuf, FILE *outfp, int no_dq)
+{
+#undef EMIT
+#define EMIT(c) \
+ (outbuf ? (*outbuf++ = (c)) : outfp ? fputc(c, outfp) : (count++))
+
+#define EMITQ() EMIT('\\')
+
+ const char *sp;
+ int ch, count = 0, needquote = 0;
+
+ if (!no_dq)
+ EMIT('"');
+ for (sp = name; sp < name + namelen; sp++) {
+ ch = *sp;
+ if (!ch)
+ break;
+ if ((ch < ' ') || (ch == '"') || (ch == '\\') ||
+ (ch == 0177)) {
+ needquote = 1;
+ switch (ch) {
+ case '\a': EMITQ(); ch = 'a'; break;
+ case '\b': EMITQ(); ch = 'b'; break;
+ case '\f': EMITQ(); ch = 'f'; break;
+ case '\n': EMITQ(); ch = 'n'; break;
+ case '\r': EMITQ(); ch = 'r'; break;
+ case '\t': EMITQ(); ch = 't'; break;
+ case '\v': EMITQ(); ch = 'v'; break;
+
+ case '\\': /* fallthru */
+ case '"': EMITQ(); break;
+ case ' ':
+ break;
+ default:
+ /* octal */
+ EMITQ();
+ EMIT(((ch >> 6) & 03) + '0');
+ EMIT(((ch >> 3) & 07) + '0');
+ ch = (ch & 07) + '0';
+ break;
+ }
+ }
+ EMIT(ch);
+ }
+ if (!no_dq)
+ EMIT('"');
+ if (outbuf)
+ *outbuf = 0;
+
+ return needquote ? count : 0;
+}
+
+int quote_c_style(const char *name, char *outbuf, FILE *outfp, int no_dq)
+{
+ int cnt = strlen(name);
+ return quote_c_style_counted(name, cnt, outbuf, outfp, no_dq);
+}
+
+/*
+ * C-style name unquoting.
+ *
+ * Quoted should point at the opening double quote. Returns
+ * an allocated memory that holds unquoted name, which the caller
+ * should free when done. Updates endp pointer to point at
+ * one past the ending double quote if given.
+ */
+
+char *unquote_c_style(const char *quoted, const char **endp)
+{
+ const char *sp;
+ char *name = NULL, *outp = NULL;
+ int count = 0, ch, ac;
+
+#undef EMIT
+#define EMIT(c) (outp ? (*outp++ = (c)) : (count++))
+
+ if (*quoted++ != '"')
+ return NULL;
+
+ while (1) {
+ /* first pass counts and allocates, second pass fills */
+ for (sp = quoted; (ch = *sp++) != '"'; ) {
+ if (ch == '\\') {
+ switch (ch = *sp++) {
+ case 'a': ch = '\a'; break;
+ case 'b': ch = '\b'; break;
+ case 'f': ch = '\f'; break;
+ case 'n': ch = '\n'; break;
+ case 'r': ch = '\r'; break;
+ case 't': ch = '\t'; break;
+ case 'v': ch = '\v'; break;
+
+ case '\\': case '"':
+ break; /* verbatim */
+
+ case '0'...'7':
+ /* octal */
+ ac = ((ch - '0') << 6);
+ if ((ch = *sp++) < '0' || '7' < ch)
+ return NULL;
+ ac |= ((ch - '0') << 3);
+ if ((ch = *sp++) < '0' || '7' < ch)
+ return NULL;
+ ac |= (ch - '0');
+ ch = ac;
+ break;
+ default:
+ return NULL; /* malformed */
+ }
+ }
+ EMIT(ch);
+ }
+
+ if (name) {
+ *outp = 0;
+ if (endp)
+ *endp = sp;
+ return name;
+ }
+ outp = name = xmalloc(count + 1);
+ }
+}
+
+void write_name_quoted(const char *prefix, int prefix_len,
+ const char *name, int quote, FILE *out)
+{
+ int needquote;
+
+ if (!quote) {
+ no_quote:
+ if (prefix_len)
+ fprintf(out, "%.*s", prefix_len, prefix);
+ fputs(name, out);
+ return;
+ }
+
+ needquote = 0;
+ if (prefix_len)
+ needquote = quote_c_style_counted(prefix, prefix_len,
+ NULL, NULL, 0);
+ if (!needquote)
+ needquote = quote_c_style(name, NULL, NULL, 0);
+ if (needquote) {
+ fputc('"', out);
+ if (prefix_len)
+ quote_c_style_counted(prefix, prefix_len,
+ NULL, out, 1);
+ quote_c_style(name, NULL, out, 1);
+ fputc('"', out);
+ }
+ else
+ goto no_quote;
+}