minix/commands/tr/str.c

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/* $NetBSD: str.c,v 1.12 2009/04/13 23:50:49 lukem Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
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#include "tr.h"
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static int backslash (STR *);
static int bracket (STR *);
static int c_class (const void *, const void *);
static void genclass (STR *);
static void genequiv (STR *);
static int genrange (STR *);
static void genseq (STR *);
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int
next(s)
STR *s;
{
int ch;
switch (s->state) {
case EOS:
return (0);
case INFINITE:
return (1);
case NORMAL:
switch (ch = *s->str) {
case '\0':
s->state = EOS;
return (0);
case '\\':
s->lastch = backslash(s);
break;
case '[':
if (bracket(s))
return (next(s));
/* FALLTHROUGH */
default:
++s->str;
s->lastch = ch;
break;
}
/* We can start a range at any time. */
if (s->str[0] == '-' && genrange(s))
return (next(s));
return (1);
case RANGE:
if (s->cnt-- == 0) {
s->state = NORMAL;
return (next(s));
}
++s->lastch;
return (1);
case SEQUENCE:
if (s->cnt-- == 0) {
s->state = NORMAL;
return (next(s));
}
return (1);
case SET:
if ((s->lastch = s->set[s->cnt++]) == OOBCH) {
s->state = NORMAL;
return (next(s));
}
return (1);
}
/* NOTREACHED */
return (0);
}
static int
bracket(s)
STR *s;
{
char *p;
switch (s->str[1]) {
case ':': /* "[:class:]" */
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if ((p = strstr((char *) s->str + 2, ":]")) == NULL)
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return (0);
*p = '\0';
s->str += 2;
genclass(s);
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s->str = (unsigned char *) p + 2;
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return (1);
case '=': /* "[=equiv=]" */
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if ((p = strstr((char *) s->str + 2, "=]")) == NULL)
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return (0);
s->str += 2;
genequiv(s);
return (1);
default: /* "[\###*n]" or "[#*n]" */
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if ((p = strpbrk((char *) s->str + 2, "*]")) == NULL)
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return (0);
if (p[0] != '*' || strchr(p, ']') == NULL)
return (0);
s->str += 1;
genseq(s);
return (1);
}
/* NOTREACHED */
}
typedef struct {
const char *name;
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int (*func) (int);
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int *set;
} CLASS;
static CLASS classes[] = {
{ "alnum", isalnum, NULL, },
{ "alpha", isalpha, NULL, },
{ "blank", isblank, NULL, },
{ "cntrl", iscntrl, NULL, },
{ "digit", isdigit, NULL, },
{ "graph", isgraph, NULL, },
{ "lower", islower, NULL, },
{ "print", isprint, NULL, },
{ "punct", ispunct, NULL, },
{ "space", isspace, NULL, },
{ "upper", isupper, NULL, },
{ "xdigit", isxdigit, NULL, },
};
static void
genclass(s)
STR *s;
{
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int cnt, (*func) (int);
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CLASS *cp, tmp;
int *p;
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tmp.name = (char *) s->str;
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if ((cp = (CLASS *)bsearch(&tmp, classes, sizeof(classes) /
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sizeof(CLASS), sizeof(CLASS), c_class)) == NULL) {
fprintf(stderr, "tr: unknown class %s\n", s->str);
exit(1);
}
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if ((cp->set = p = malloc((NCHARS + 1) * sizeof(int))) == NULL) {
perror("malloc");
exit(1);
}
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memset(p, 0, (NCHARS + 1) * sizeof(int));
for (cnt = 0, func = cp->func; cnt < NCHARS; ++cnt)
if ((func)(cnt))
*p++ = cnt;
*p = OOBCH;
s->cnt = 0;
s->state = SET;
s->set = cp->set;
}
static int
c_class(a, b)
const void *a, *b;
{
return (strcmp(((const CLASS *)a)->name, ((const CLASS *)b)->name));
}
/*
* English doesn't have any equivalence classes, so for now
* we just syntax check and grab the character.
*/
static void
genequiv(s)
STR *s;
{
if (*s->str == '\\') {
s->equiv[0] = backslash(s);
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if (*s->str != '=') {
fprintf(stderr, "tr: misplaced equivalence equals sign\n");
exit(1);
}
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} else {
s->equiv[0] = s->str[0];
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if (s->str[1] != '=') {
fprintf(stderr, "tr: misplaced equivalence equals sign\n");
exit(1);
}
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}
s->str += 2;
s->cnt = 0;
s->state = SET;
s->set = s->equiv;
}
static int
genrange(s)
STR *s;
{
int stopval;
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unsigned char *savestart;
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savestart = s->str;
stopval = *++s->str == '\\' ? backslash(s) : *s->str++;
if (stopval < (u_char)s->lastch) {
s->str = savestart;
return (0);
}
s->cnt = stopval - s->lastch + 1;
s->state = RANGE;
--s->lastch;
return (1);
}
static void
genseq(s)
STR *s;
{
char *ep;
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if (s->which == STRING1) {
fprintf(stderr, "tr: sequences only valid in string2\n");
exit(1);
}
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if (*s->str == '\\')
s->lastch = backslash(s);
else
s->lastch = *s->str++;
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if (*s->str != '*') {
fprintf(stderr, "tr: misplaced sequence asterisk\n");
exit(1);
}
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switch (*++s->str) {
case '\\':
s->cnt = backslash(s);
break;
case ']':
s->cnt = 0;
++s->str;
break;
default:
if (isdigit(*s->str)) {
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s->cnt = strtol((char *) s->str, &ep, 0);
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if (*ep == ']') {
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s->str = (unsigned char *) ep + 1;
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break;
}
}
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fprintf(stderr, "tr: illegal sequence count\n");
exit(1);
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/* NOTREACHED */
}
s->state = s->cnt ? SEQUENCE : INFINITE;
}
/*
* Translate \??? into a character. Up to 3 octal digits, if no digits either
* an escape code or a literal character.
*/
static int
backslash(s)
STR *s;
{
int ch, cnt, val;
for (cnt = val = 0;;) {
ch = *++s->str;
if (!isascii(ch) || !isdigit(ch))
break;
val = val * 8 + ch - '0';
if (++cnt == 3) {
++s->str;
break;
}
}
if (cnt)
return (val);
if (ch != '\0')
++s->str;
switch (ch) {
case 'a': /* escape characters */
return ('\7');
case 'b':
return ('\b');
case 'f':
return ('\f');
case 'n':
return ('\n');
case 'r':
return ('\r');
case 't':
return ('\t');
case 'v':
return ('\13');
case '\0': /* \" -> \ */
s->state = EOS;
return ('\\');
default: /* \x" -> x */
return (ch);
}
}