[unix-history] / usr.bin / tr / str.c

/*-
 * Copyright (c) 1991 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
static char sccsid[] = "@(#)str.c	5.9 (Berkeley) 3/4/93";
#endif /* not lint */

#include <sys/cdefs.h>
#include <sys/types.h>

#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "extern.h"

static int	backslash __P((STR *));
static int	bracket __P((STR *));
static int	c_class __P((const void *, const void *));
static void	genclass __P((STR *));
static void	genequiv __P((STR *));
static int	genrange __P((STR *));
static void	genseq __P((STR *));

int
next(s)
	register STR *s;
{
	register 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 */
}

static int
bracket(s)
	register STR *s;
{
	register char *p;

	switch (s->str[1]) {
	case ':':				/* "[:class:]" */
		if ((p = strstr(s->str + 2, ":]")) == NULL)
			return (0);
		*p = '\0';
		s->str += 2;
		genclass(s);
		s->str = p + 2;
		return (1);
	case '=':				/* "[=equiv=]" */
		if ((p = strstr(s->str + 2, "=]")) == NULL)
			return (0);
		s->str += 2;
		genequiv(s);
		return (1);
	default:				/* "[\###*n]" or "[#*n]" */
		if ((p = strpbrk(s->str + 2, "*]")) == NULL)
			return (0);
		if (p[0] != '*' || index(p, ']') == NULL)
			return (0);
		s->str += 1;
		genseq(s);
		return (1);
	}
	/* NOTREACHED */
}

int isalnum __P((int)),
    isalpha __P((int)),
/*    isblank __P((int)), until 4.4 */
    isspace __P((int)),
    iscntrl __P((int)),
    isdigit __P((int)),
    isgraph __P((int)),
    islower __P((int)),
    isprint __P((int)),
    ispunct __P((int)),
    isupper __P((int)),
    isxdigit __P((int));


static int isblank(x) /* until 4.4 */
     int x;
{
    if ((x == ' ') || (x== '\t')) return 1;
    return 0;
}


typedef struct {
	char *name;
	int (*func) __P((int));
	int *set;
} CLASS;

static CLASS classes[] = {
	{ "alnum",  isalnum,  },
	{ "alpha",  isalpha,  },
	{ "blank",  isblank,  },
	{ "cntrl",  iscntrl,  },
	{ "digit",  isdigit,  },
	{ "graph",  isgraph,  },
	{ "lower",  islower,  },
	{ "print",  isupper,  },
	{ "punct",  ispunct,  },
	{ "space",  isspace,  },
	{ "upper",  isupper,  },
	{ "xdigit", isxdigit, },
};

static void
genclass(s)
	STR *s;
{
	register int cnt, (*func) __P((int));
	CLASS *cp, tmp;
	int *p;

	tmp.name = s->str;
	if ((cp = (CLASS *)bsearch(&tmp, classes, sizeof(classes) /
	    sizeof(CLASS), sizeof(CLASS), c_class)) == NULL)
		err("unknown class %s", s->str);

	if ((cp->set = p = malloc((NCHARS + 1) * sizeof(int))) == NULL)
		err("%s", strerror(errno));
	bzero(p, (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(((CLASS *)a)->name, ((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);
		if (*s->str != '=')
			err("misplaced equivalence equals sign");
	} else {
		s->equiv[0] = s->str[0];
		if (s->str[1] != '=')
			err("misplaced equivalence equals sign");
	}
	s->str += 2;
	s->cnt = 0;
	s->state = SET;
	s->set = s->equiv;
}

static int
genrange(s)
	STR *s;
{
	int stopval;
	char *savestart;

	savestart = s->str;
	stopval = *++s->str == '\\' ? backslash(s) : *s->str++;
	if (stopval < 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;

	if (s->which == STRING1)
		err("sequences only valid in string2");

	if (*s->str == '\\')
		s->lastch = backslash(s);
	else
		s->lastch = *s->str++;
	if (*s->str != '*')
		err("misplaced sequence asterisk");

	switch (*++s->str) {
	case '\\':
		s->cnt = backslash(s);
		break;
	case ']':
		s->cnt = 0;
		++s->str;
		break;
	default:
		if (isdigit(*s->str)) {
			s->cnt = strtol(s->str, &ep, 0);
			if (*ep == ']') {
				s->str = ep + 1;
				break;
			}
		}
		err("illegal sequence count");
		/* NOTREACHED */
	}

	s->state = s->cnt ? SEQUENCE : INFINITE;
}

/* Use the #defines isXXX() here, DON'T use them above. */
#include <ctype.h>

/*
 * Translate \??? into a character.  Up to 3 octal digits, if no digits either
 * an escape code or a literal character.
 */
static int
backslash(s)
	register STR *s;
{
	register 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);
	}
}
Commit	Line	Data
ae6495a7 NW	1	/*-
	2	* Copyright (c) 1991 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	static char sccsid[] = "@(#)str.c 5.9 (Berkeley) 3/4/93";
	36	#endif /* not lint */
	37
	38	#include <sys/cdefs.h>
	39	#include <sys/types.h>
	40
	41	#include <errno.h>
	42	#include <stddef.h>
	43	#include <stdio.h>
	44	#include <stdlib.h>
	45	#include <string.h>
	46
	47	#include "extern.h"
	48
	49	static int backslash __P((STR *));
	50	static int bracket __P((STR *));
	51	static int c_class __P((const void , const void ));
	52	static void genclass __P((STR *));
	53	static void genequiv __P((STR *));
	54	static int genrange __P((STR *));
	55	static void genseq __P((STR *));
	56
	57	int
	58	next(s)
	59	register STR *s;
	60	{
	61	register int ch;
	62
	63	switch (s->state) {
	64	case EOS:
65	return (0);
66	case INFINITE:
67	return (1);
68	case NORMAL:
69	switch (ch = *s->str) {
70	case '\0':
71	s->state = EOS;
72	return (0);
73	case '\\':
74	s->lastch = backslash(s);
75	break;
76	case '[':
77	if (bracket(s))
78	return (next(s));
79	/* FALLTHROUGH */
80	default:
81	++s->str;
82	s->lastch = ch;
83	break;
84	}
85
86	/* We can start a range at any time. */
87	if (s->str[0] == '-' && genrange(s))
88	return (next(s));
89	return (1);
90	case RANGE:
91	if (s->cnt-- == 0) {
92	s->state = NORMAL;
93	return (next(s));
94	}
95	++s->lastch;
96	return (1);
97	case SEQUENCE:
98	if (s->cnt-- == 0) {
99	s->state = NORMAL;
100	return (next(s));
101	}
102	return (1);
103	case SET:
104	if ((s->lastch = s->set[s->cnt++]) == OOBCH) {
105	s->state = NORMAL;
106	return (next(s));
107	}
108	return (1);
109	}
110	/* NOTREACHED */
111	}
112
113	static int
114	bracket(s)
115	register STR *s;
116	{
117	register char *p;
118
119	switch (s->str[1]) {
120	case ':': /* "[:class:]" */
121	if ((p = strstr(s->str + 2, ":]")) == NULL)
122	return (0);
123	*p = '\0';
124	s->str += 2;
125	genclass(s);
126	s->str = p + 2;
127	return (1);
128	case '=': /* "[=equiv=]" */
129	if ((p = strstr(s->str + 2, "=]")) == NULL)
130	return (0);
131	s->str += 2;
132	genequiv(s);
133	return (1);
134	default: /* "[\###n]" or "[#n]" */
135	if ((p = strpbrk(s->str + 2, "*]")) == NULL)
136	return (0);
137	if (p[0] != '*' \|\| index(p, ']') == NULL)
138	return (0);
139	s->str += 1;
140	genseq(s);
141	return (1);
142	}
143	/* NOTREACHED */
144	}
145
146	int isalnum __P((int)),
147	isalpha __P((int)),
9b729a75	148	/* isblank __P((int)), until 4.4 */
ae6495a7 NW	149	isspace __P((int)),
	150	iscntrl __P((int)),
	151	isdigit __P((int)),
	152	isgraph __P((int)),
	153	islower __P((int)),
	154	isprint __P((int)),
	155	ispunct __P((int)),
	156	isupper __P((int)),
	157	isxdigit __P((int));
	158
ef9a6ca4 NW	159
	160	static int isblank(x) /* until 4.4 */
	161	int x;
	162	{
	163	if ((x == ' ') \|\| (x== '\t')) return 1;
	164	return 0;
	165	}
	166
	167
ae6495a7 NW	168	typedef struct {
	169	char *name;
	170	int (*func) __P((int));
	171	int *set;
	172	} CLASS;
	173
	174	static CLASS classes[] = {
	175	{ "alnum", isalnum, },
	176	{ "alpha", isalpha, },
	177	{ "blank", isblank, },
	178	{ "cntrl", iscntrl, },
	179	{ "digit", isdigit, },
	180	{ "graph", isgraph, },
	181	{ "lower", islower, },
	182	{ "print", isupper, },
	183	{ "punct", ispunct, },
	184	{ "space", isspace, },
	185	{ "upper", isupper, },
	186	{ "xdigit", isxdigit, },
	187	};
	188
	189	static void
	190	genclass(s)
	191	STR *s;
	192	{
	193	register int cnt, (*func) __P((int));
	194	CLASS *cp, tmp;
	195	int *p;
	196
	197	tmp.name = s->str;
	198	if ((cp = (CLASS *)bsearch(&tmp, classes, sizeof(classes) /
	199	sizeof(CLASS), sizeof(CLASS), c_class)) == NULL)
	200	err("unknown class %s", s->str);
	201
	202	if ((cp->set = p = malloc((NCHARS + 1) * sizeof(int))) == NULL)
	203	err("%s", strerror(errno));
	204	bzero(p, (NCHARS + 1) * sizeof(int));
	205	for (cnt = 0, func = cp->func; cnt < NCHARS; ++cnt)
	206	if ((func)(cnt))
	207	*p++ = cnt;
	208	*p = OOBCH;
	209
	210	s->cnt = 0;
	211	s->state = SET;
	212	s->set = cp->set;
	213	}
	214
	215	static int
	216	c_class(a, b)
	217	const void a, b;
	218	{
	219	return (strcmp(((CLASS )a)->name, ((CLASS )b)->name));
	220	}
	221
	222	/*
	223	* English doesn't have any equivalence classes, so for now
	224	* we just syntax check and grab the character.
	225	*/
	226	static void
	227	genequiv(s)
	228	STR *s;
	229	{
	230	if (*s->str == '\\') {
	231	s->equiv[0] = backslash(s);
232	if (*s->str != '=')
233	err("misplaced equivalence equals sign");
234	} else {
235	s->equiv[0] = s->str[0];
236	if (s->str[1] != '=')
237	err("misplaced equivalence equals sign");
238	}
239	s->str += 2;
240	s->cnt = 0;
241	s->state = SET;
242	s->set = s->equiv;
243	}
244
245	static int
246	genrange(s)
247	STR *s;
248	{
249	int stopval;
250	char *savestart;
251
252	savestart = s->str;
cec1dca5	253	stopval = ++s->str == '\\' ? backslash(s) : s->str++;
ae6495a7 NW	254	if (stopval < s->lastch) {
	255	s->str = savestart;
	256	return (0);
	257	}
	258	s->cnt = stopval - s->lastch + 1;
	259	s->state = RANGE;
	260	--s->lastch;
	261	return (1);
	262	}
	263
	264	static void
	265	genseq(s)
	266	STR *s;
	267	{
	268	char *ep;
	269
	270	if (s->which == STRING1)
	271	err("sequences only valid in string2");
	272
	273	if (*s->str == '\\')
	274	s->lastch = backslash(s);
	275	else
	276	s->lastch = *s->str++;
	277	if (s->str != '')
	278	err("misplaced sequence asterisk");
	279
	280	switch (*++s->str) {
	281	case '\\':
	282	s->cnt = backslash(s);
	283	break;
	284	case ']':
	285	s->cnt = 0;
	286	++s->str;
	287	break;
	288	default:
	289	if (isdigit(*s->str)) {
	290	s->cnt = strtol(s->str, &ep, 0);
	291	if (*ep == ']') {
	292	s->str = ep + 1;
	293	break;
	294	}
	295	}
	296	err("illegal sequence count");
	297	/* NOTREACHED */
	298	}
	299
	300	s->state = s->cnt ? SEQUENCE : INFINITE;
	301	}
	302
	303	/* Use the #defines isXXX() here, DON'T use them above. */
	304	#include <ctype.h>
	305
	306	/*
	307	* Translate \??? into a character. Up to 3 octal digits, if no digits either
	308	* an escape code or a literal character.
	309	*/
	310	static int
	311	backslash(s)
	312	register STR *s;
	313	{
	314	register int ch, cnt, val;
	315
	316	for (cnt = val = 0;;) {
	317	ch = *++s->str;
318	if (!isascii(ch) \|\| !isdigit(ch))
319	break;
320	val = val * 8 + ch - '0';
321	if (++cnt == 3) {
322	++s->str;
323	break;
324	}
325	}
326	if (cnt)
327	return (val);
328	if (ch != '\0')
329	++s->str;
330	switch (ch) {
331	case 'a': /* escape characters */
332	return ('\7');
333	case 'b':
334	return ('\b');
335	case 'f':
336	return ('\f');
337	case 'n':
338	return ('\n');
339	case 'r':
340	return ('\r');
341	case 't':
342	return ('\t');
343	case 'v':
344	return ('\13');
345	case '\0': /* \" -> \ */
346	s->state = EOS;
347	return ('\\');
348	default: /* \x" -> x */
349	return (ch);
350	}
351	}