-/* $Id: mandoc.c,v 1.64 2012/05/31 22:34:06 schwarze Exp $ */
+/* $Id: mandoc.c,v 1.66 2012/06/12 20:21:04 kristaps Exp $ */
/*
* Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2011, 2012 Ingo Schwarze <schwarze@openbsd.org>
enum mandoc_esc
mandoc_escape(const char **end, const char **start, int *sz)
{
- char c, term;
- int i, rlim;
- const char *cp, *rstart;
+ const char *local_start;
+ int local_sz;
+ char term;
enum mandoc_esc gly;
- cp = *end;
- rstart = cp;
- if (start)
- *start = rstart;
- i = rlim = 0;
+ /*
+ * When the caller doesn't provide return storage,
+ * use local storage.
+ */
+
+ if (NULL == start)
+ start = &local_start;
+ if (NULL == sz)
+ sz = &local_sz;
+
+ /*
+ * Beyond the backslash, at least one input character
+ * is part of the escape sequence. With one exception
+ * (see below), that character won't be returned.
+ */
+
gly = ESCAPE_ERROR;
+ *start = ++*end;
+ *sz = 0;
term = '\0';
- switch ((c = cp[i++])) {
+ switch ((*start)[-1]) {
/*
* First the glyphs. There are several different forms of
* these, but each eventually returns a substring of the glyph
*/
case ('('):
gly = ESCAPE_SPECIAL;
- rlim = 2;
+ *sz = 2;
break;
case ('['):
gly = ESCAPE_SPECIAL;
* Unicode codepoint. Here, however, only check whether
* it's not a zero-width escape.
*/
- if ('u' == cp[i] && ']' != cp[i + 1])
+ if ('u' == (*start)[0] && ']' != (*start)[1])
gly = ESCAPE_UNICODE;
term = ']';
break;
case ('C'):
- if ('\'' != cp[i])
+ if ('\'' != **start)
return(ESCAPE_ERROR);
gly = ESCAPE_SPECIAL;
+ *start = ++*end;
term = '\'';
break;
* let us just skip the next character.
*/
case ('z'):
- (*end)++;
return(ESCAPE_SKIPCHAR);
/*
case ('f'):
if (ESCAPE_ERROR == gly)
gly = ESCAPE_FONT;
-
- rstart= &cp[i];
- if (start)
- *start = rstart;
-
- switch (cp[i++]) {
+ switch (**start) {
case ('('):
- rlim = 2;
+ *start = ++*end;
+ *sz = 2;
break;
case ('['):
+ *start = ++*end;
term = ']';
break;
default:
- rlim = 1;
- i--;
+ *sz = 1;
break;
}
break;
case ('X'):
/* FALLTHROUGH */
case ('Z'):
- if ('\'' != cp[i++])
+ if ('\'' != **start)
return(ESCAPE_ERROR);
gly = ESCAPE_IGNORE;
+ *start = ++*end;
term = '\'';
break;
case ('w'):
/* FALLTHROUGH */
case ('x'):
+ if ('\'' != **start)
+ return(ESCAPE_ERROR);
if (ESCAPE_ERROR == gly)
gly = ESCAPE_IGNORE;
- if ('\'' != cp[i++])
- return(ESCAPE_ERROR);
+ *start = ++*end;
term = '\'';
break;
* XXX Do any other escapes need similar handling?
*/
case ('N'):
- if ('\0' == cp[i])
+ if ('\0' == **start)
return(ESCAPE_ERROR);
- *end = &cp[++i];
- if (isdigit((unsigned char)cp[i-1]))
+ (*end)++;
+ if (isdigit((unsigned char)**start)) {
+ *sz = 1;
return(ESCAPE_IGNORE);
+ }
+ (*start)++;
while (isdigit((unsigned char)**end))
(*end)++;
- if (start)
- *start = &cp[i];
- if (sz)
- *sz = *end - &cp[i];
+ *sz = *end - *start;
if ('\0' != **end)
(*end)++;
return(ESCAPE_NUMBERED);
case ('s'):
gly = ESCAPE_IGNORE;
- rstart = &cp[i];
- if (start)
- *start = rstart;
-
/* See +/- counts as a sign. */
- c = cp[i];
- if ('+' == c || '-' == c || ASCII_HYPH == c)
- ++i;
+ if ('+' == **end || '-' == **end || ASCII_HYPH == **end)
+ (*end)++;
- switch (cp[i++]) {
+ switch (**end) {
case ('('):
- rlim = 2;
+ *start = ++*end;
+ *sz = 2;
break;
case ('['):
+ *start = ++*end;
term = ']';
break;
case ('\''):
+ *start = ++*end;
term = '\'';
break;
default:
- rlim = 1;
- i--;
+ *sz = 1;
break;
}
- /* See +/- counts as a sign. */
- c = cp[i];
- if ('+' == c || '-' == c || ASCII_HYPH == c)
- ++i;
-
break;
/*
* Anything else is assumed to be a glyph.
+ * In this case, pass back the character after the backslash.
*/
default:
gly = ESCAPE_SPECIAL;
- rlim = 1;
- i--;
+ *start = --*end;
+ *sz = 1;
break;
}
assert(ESCAPE_ERROR != gly);
- *end = rstart = &cp[i];
- if (start)
- *start = rstart;
-
/*
* Read up to the terminating character,
* paying attention to nested escapes.
break;
}
}
- rlim = (*end)++ - rstart;
+ *sz = (*end)++ - *start;
} else {
- assert(rlim > 0);
- if ((size_t)rlim > strlen(rstart))
+ assert(*sz > 0);
+ if ((size_t)*sz > strlen(*start))
return(ESCAPE_ERROR);
- *end += rlim;
+ *end += *sz;
}
- if (sz)
- *sz = rlim;
/* Run post-processors. */
* Pretend that the constant-width font modes are the
* same as the regular font modes.
*/
- if (2 == rlim && 'C' == *rstart)
- rstart++;
- else if (1 != rlim)
+ if (2 == *sz && 'C' == **start) {
+ (*start)++;
+ (*sz)--;
+ } else if (1 != *sz)
break;
- switch (*rstart) {
+ switch (**start) {
case ('3'):
/* FALLTHROUGH */
case ('B'):
}
break;
case (ESCAPE_SPECIAL):
- if (1 != rlim)
- break;
- if ('c' == *rstart)
+ if (1 == *sz && 'c' == **start)
gly = ESCAPE_NOSPACE;
break;
default:
return(found && !enclosed);
}
-/*
- * Find out whether a line is a macro line or not. If it is, adjust the
- * current position and return one; if it isn't, return zero and don't
- * change the current position.
- */
-int
-mandoc_getcontrol(const char *cp, int *ppos)
-{
- int pos;
-
- pos = *ppos;
-
- if ('\\' == cp[pos] && '.' == cp[pos + 1])
- pos += 2;
- else if ('.' == cp[pos] || '\'' == cp[pos])
- pos++;
- else
- return(0);
-
- while (' ' == cp[pos] || '\t' == cp[pos])
- pos++;
-
- *ppos = pos;
- return(1);
-}
-
/*
* Convert a string to a long that may not be <0.
* If the string is invalid, or is less than 0, return -1.
git.ckatri.com / mandoc.git / blobdiff