minix/commands/mdocml/mandoc.c

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2010-06-26 04:20:06 +02:00
/* $Id: mandoc.c,v 1.19 2010/06/19 20:46:28 kristaps Exp $ */
/*
* Copyright (c) 2008, 2009 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "mandoc.h"
#include "libmandoc.h"
static int a2time(time_t *, const char *, const char *);
static int spec_norm(char *, int);
/*
* "Normalise" a special string by converting its ASCII_HYPH entries
* into actual hyphens.
*/
static int
spec_norm(char *p, int sz)
{
int i;
for (i = 0; i < sz; i++)
if (ASCII_HYPH == p[i])
p[i] = '-';
return(sz);
}
int
mandoc_special(char *p)
{
int terminator; /* Terminator for \s. */
int lim; /* Limit for N in \s. */
int c, i;
char *sv;
sv = p;
if ('\\' != *p++)
return(spec_norm(sv, 0));
switch (*p) {
case ('\''):
/* FALLTHROUGH */
case ('`'):
/* FALLTHROUGH */
case ('q'):
/* FALLTHROUGH */
case (ASCII_HYPH):
/* FALLTHROUGH */
case ('-'):
/* FALLTHROUGH */
case ('~'):
/* FALLTHROUGH */
case ('^'):
/* FALLTHROUGH */
case ('%'):
/* FALLTHROUGH */
case ('0'):
/* FALLTHROUGH */
case (' '):
/* FALLTHROUGH */
case ('}'):
/* FALLTHROUGH */
case ('|'):
/* FALLTHROUGH */
case ('&'):
/* FALLTHROUGH */
case ('.'):
/* FALLTHROUGH */
case (':'):
/* FALLTHROUGH */
case ('c'):
/* FALLTHROUGH */
case ('e'):
return(spec_norm(sv, 2));
case ('s'):
if ('\0' == *++p)
return(spec_norm(sv, 2));
c = 2;
terminator = 0;
lim = 1;
if (*p == '\'') {
lim = 0;
terminator = 1;
++p;
++c;
} else if (*p == '[') {
lim = 0;
terminator = 2;
++p;
++c;
} else if (*p == '(') {
lim = 2;
terminator = 3;
++p;
++c;
}
if (*p == '+' || *p == '-') {
++p;
++c;
}
if (*p == '\'') {
if (terminator)
return(spec_norm(sv, 0));
lim = 0;
terminator = 1;
++p;
++c;
} else if (*p == '[') {
if (terminator)
return(spec_norm(sv, 0));
lim = 0;
terminator = 2;
++p;
++c;
} else if (*p == '(') {
if (terminator)
return(spec_norm(sv, 0));
lim = 2;
terminator = 3;
++p;
++c;
}
/* TODO: needs to handle floating point. */
if ( ! isdigit((u_char)*p))
return(spec_norm(sv, 0));
for (i = 0; isdigit((u_char)*p); i++) {
if (lim && i >= lim)
break;
++p;
++c;
}
if (terminator && terminator < 3) {
if (1 == terminator && *p != '\'')
return(spec_norm(sv, 0));
if (2 == terminator && *p != ']')
return(spec_norm(sv, 0));
++p;
++c;
}
return(spec_norm(sv, c));
case ('f'):
/* FALLTHROUGH */
case ('F'):
/* FALLTHROUGH */
case ('*'):
if ('\0' == *++p || isspace((u_char)*p))
return(spec_norm(sv, 0));
switch (*p) {
case ('('):
if ('\0' == *++p || isspace((u_char)*p))
return(spec_norm(sv, 0));
return(spec_norm(sv, 4));
case ('['):
for (c = 3, p++; *p && ']' != *p; p++, c++)
if (isspace((u_char)*p))
break;
return(spec_norm(sv, *p == ']' ? c : 0));
default:
break;
}
return(spec_norm(sv, 3));
case ('('):
if ('\0' == *++p || isspace((u_char)*p))
return(spec_norm(sv, 0));
if ('\0' == *++p || isspace((u_char)*p))
return(spec_norm(sv, 0));
return(spec_norm(sv, 4));
case ('['):
break;
default:
return(spec_norm(sv, 0));
}
for (c = 3, p++; *p && ']' != *p; p++, c++)
if (isspace((u_char)*p))
break;
return(spec_norm(sv, *p == ']' ? c : 0));
}
void *
mandoc_calloc(size_t num, size_t size)
{
void *ptr;
ptr = calloc(num, size);
if (NULL == ptr) {
perror(NULL);
exit(EXIT_FAILURE);
}
return(ptr);
}
void *
mandoc_malloc(size_t size)
{
void *ptr;
ptr = malloc(size);
if (NULL == ptr) {
perror(NULL);
exit(EXIT_FAILURE);
}
return(ptr);
}
void *
mandoc_realloc(void *ptr, size_t size)
{
ptr = realloc(ptr, size);
if (NULL == ptr) {
perror(NULL);
exit(EXIT_FAILURE);
}
return(ptr);
}
char *
mandoc_strdup(const char *ptr)
{
char *p;
p = strdup(ptr);
if (NULL == p) {
perror(NULL);
exit(EXIT_FAILURE);
}
return(p);
}
static int
a2time(time_t *t, const char *fmt, const char *p)
{
struct tm tm;
char *pp;
memset(&tm, 0, sizeof(struct tm));
pp = strptime(p, fmt, &tm);
if (NULL != pp && '\0' == *pp) {
*t = mktime(&tm);
return(1);
}
return(0);
}
/*
* Convert from a manual date string (see mdoc(7) and man(7)) into a
* date according to the stipulated date type.
*/
time_t
mandoc_a2time(int flags, const char *p)
{
time_t t;
if (MTIME_MDOCDATE & flags) {
if (0 == strcmp(p, "$" "Mdocdate$"))
return(time(NULL));
if (a2time(&t, "$" "Mdocdate: %b %d %Y $", p))
return(t);
}
if (MTIME_CANONICAL & flags || MTIME_REDUCED & flags)
if (a2time(&t, "%b %d, %Y", p))
return(t);
if (MTIME_ISO_8601 & flags)
if (a2time(&t, "%Y-%m-%d", p))
return(t);
if (MTIME_REDUCED & flags) {
if (a2time(&t, "%d, %Y", p))
return(t);
if (a2time(&t, "%Y", p))
return(t);
}
return(0);
}
int
mandoc_eos(const char *p, size_t sz)
{
if (0 == sz)
return(0);
/*
* End-of-sentence recognition must include situations where
* some symbols, such as `)', allow prior EOS punctuation to
* propogate outward.
*/
for ( ; sz; sz--) {
switch (p[(int)sz - 1]) {
case ('\"'):
/* FALLTHROUGH */
case ('\''):
/* FALLTHROUGH */
case (']'):
/* FALLTHROUGH */
case (')'):
break;
case ('.'):
/* Escaped periods. */
if (sz > 1 && '\\' == p[(int)sz - 2])
return(0);
/* FALLTHROUGH */
case ('!'):
/* FALLTHROUGH */
case ('?'):
return(1);
default:
return(0);
}
}
return(0);
}
int
mandoc_hyph(const char *start, const char *c)
{
/*
* Choose whether to break at a hyphenated character. We only
* do this if it's free-standing within a word.
*/
/* Skip first/last character of buffer. */
if (c == start || '\0' == *(c + 1))
return(0);
/* Skip first/last character of word. */
if ('\t' == *(c + 1) || '\t' == *(c - 1))
return(0);
if (' ' == *(c + 1) || ' ' == *(c - 1))
return(0);
/* Skip double invocations. */
if ('-' == *(c + 1) || '-' == *(c - 1))
return(0);
/* Skip escapes. */
if ('\\' == *(c - 1))
return(0);
return(1);
}