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/*
* Copyright (c) 2008, Natacha Porté
* Copyright (c) 2011, Vicent MartÃ
* Copyright (c) 2014, Xavier Mendez, Devin Torres and the Hoedown authors
* Copyright (c) Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#if HAVE_SYS_QUEUE
# include <sys/queue.h>
#endif
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lowdown.h"
#include "extern.h"
/*
* Escape unsafe text into roff output such that no roff features are
* invoked by the text (macros, escapes, etc.).
* If "oneline" is >0, newlines are replaced with spaces; if =0,
* newlines are retained and roff delimiters after the newline are
* escaped; if <0, like =0 except that the first character if a
* delimiter is also escaped.
* If "literal", doesn't strip leading space.
* Return zero on failure, non-zero on success.
*/
int
lowdown_nroff_esc(struct lowdown_buf *ob, const char *data, size_t size,
int oneline, int literal)
{
size_t i = 0;
if (size == 0)
return 1;
/* Strip leading whitespace. */
if (!literal && ob->size > 0 && ob->data[ob->size - 1] == '\n')
while (i < size && (data[i] == ' ' || data[i] == '\n'))
i++;
/*
* According to mandoc_char(7), we need to escape the backtick,
* single apostrophe, and tilde or else they'll be considered as
* special Unicode output.
* Slashes need to be escaped too.
* We also escape double-quotes because this text might be used
* within quoted macro arguments.
*/
for ( ; i < size; i++)
switch (data[i]) {
case '^':
if (!HBUF_PUTSL(ob, "\\(ha"))
return 0;
break;
case '~':
if (!HBUF_PUTSL(ob, "\\(ti"))
return 0;
break;
case '`':
if (!HBUF_PUTSL(ob, "\\(ga"))
return 0;
break;
case '"':
if (!HBUF_PUTSL(ob, "\\(dq"))
return 0;
break;
case '\n':
if (!hbuf_putc(ob, oneline > 0 ? ' ' : '\n'))
return 0;
if (literal)
break;
/* Prevent leading spaces on the line. */
while (i + 1 < size &&
(data[i + 1] == ' ' ||
data[i + 1] == '\n'))
i++;
break;
case '\\':
if (!HBUF_PUTSL(ob, "\\e"))
return 0;
break;
case '\'':
case '.':
if (((oneline < 0 && i == 0) ||
(oneline <= 0 &&
ob->size > 0 &&
ob->data[ob->size - 1] == '\n')) &&
!HBUF_PUTSL(ob, "\\&"))
return 0;
/* FALLTHROUGH */
default:
if (!hbuf_putc(ob, data[i]))
return 0;
break;
}
return 1;
}
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