+/*
+ * Parse a quoted or unquoted roff-style request or macro argument.
+ * Return a pointer to the parsed argument, which is either the original
+ * pointer or advanced by one byte in case the argument is quoted.
+ * NUL-terminate the argument in place.
+ * Collapse pairs of quotes inside quoted arguments.
+ * Advance the argument pointer to the next argument,
+ * or to the NUL byte terminating the argument line.
+ */
+char *
+roff_getarg(struct roff *r, char **cpp, int ln, int *pos)
+{
+ struct buf buf;
+ char *cp, *start;
+ int newesc, pairs, quoted, white;
+
+ /* Quoting can only start with a new word. */
+ start = *cpp;
+ quoted = 0;
+ if ('"' == *start) {
+ quoted = 1;
+ start++;
+ }
+
+ newesc = pairs = white = 0;
+ for (cp = start; '\0' != *cp; cp++) {
+
+ /*
+ * Move the following text left
+ * after quoted quotes and after "\\" and "\t".
+ */
+ if (pairs)
+ cp[-pairs] = cp[0];
+
+ if ('\\' == cp[0]) {
+ /*
+ * In copy mode, translate double to single
+ * backslashes and backslash-t to literal tabs.
+ */
+ switch (cp[1]) {
+ case 'a':
+ case 't':
+ cp[-pairs] = '\t';
+ pairs++;
+ cp++;
+ break;
+ case '\\':
+ newesc = 1;
+ cp[-pairs] = ASCII_ESC;
+ pairs++;
+ cp++;
+ break;
+ case ' ':
+ /* Skip escaped blanks. */
+ if (0 == quoted)
+ cp++;
+ break;
+ default:
+ break;
+ }
+ } else if (0 == quoted) {
+ if (' ' == cp[0]) {
+ /* Unescaped blanks end unquoted args. */
+ white = 1;
+ break;
+ }
+ } else if ('"' == cp[0]) {
+ if ('"' == cp[1]) {
+ /* Quoted quotes collapse. */
+ pairs++;
+ cp++;
+ } else {
+ /* Unquoted quotes end quoted args. */
+ quoted = 2;
+ break;
+ }
+ }
+ }
+
+ /* Quoted argument without a closing quote. */
+ if (1 == quoted)
+ mandoc_msg(MANDOCERR_ARG_QUOTE, ln, *pos, NULL);
+
+ /* NUL-terminate this argument and move to the next one. */
+ if (pairs)
+ cp[-pairs] = '\0';
+ if ('\0' != *cp) {
+ *cp++ = '\0';
+ while (' ' == *cp)
+ cp++;
+ }
+ *pos += (int)(cp - start) + (quoted ? 1 : 0);
+ *cpp = cp;
+
+ if ('\0' == *cp && (white || ' ' == cp[-1]))
+ mandoc_msg(MANDOCERR_SPACE_EOL, ln, *pos, NULL);
+
+ start = mandoc_strdup(start);
+ if (newesc == 0)
+ return start;
+
+ buf.buf = start;
+ buf.sz = strlen(start) + 1;
+ buf.next = NULL;
+ if (roff_expand(r, &buf, ln, 0, ASCII_ESC) & ROFF_IGN) {
+ free(buf.buf);
+ buf.buf = mandoc_strdup("");
+ }
+ return buf.buf;
+}
+
+
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