usr/dash/mystring.c

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * 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.
 */

/*
 * String functions.
 *
 *	equal(s1, s2)		Return true if strings are equal.
 *	scopy(from, to)		Copy a string.
 *	scopyn(from, to, n)	Like scopy, but checks for overflow.
 *	number(s)		Convert a string of digits to an integer.
 *	is_number(s)		Return true if s is a string of digits.
 */

#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include "shell.h"
#include "syntax.h"
#include "error.h"
#include "mystring.h"
#include "memalloc.h"
#include "parser.h"
#include "system.h"


char nullstr[1];		/* zero length string */
const char spcstr[] = " ";
const char snlfmt[] = "%s\n";
const char dolatstr[] = { CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=',
			  CTLQUOTEMARK, '\0' };
const char illnum[] = "Illegal number: %s";
const char homestr[] = "HOME";

/*
 * equal - #defined in mystring.h
 */

/*
 * scopy - #defined in mystring.h
 */


#if 0
/*
 * scopyn - copy a string from "from" to "to", truncating the string
 *		if necessary.  "To" is always nul terminated, even if
 *		truncation is performed.  "Size" is the size of "to".
 */

void
scopyn(const char *from, char *to, int size)
{

	while (--size > 0) {
		if ((*to++ = *from++) == '\0')
			return;
	}
	*to = '\0';
}
#endif


/*
 * prefix -- see if pfx is a prefix of string.
 */

char *
prefix(const char *string, const char *pfx)
{
	while (*pfx) {
		if (*pfx++ != *string++)
			return 0;
	}
	return (char *) string;
}

void badnum(const char *s)
{
	sh_error(illnum, s);
}

/*
 * Convert a string into an integer of type intmax_t.  Alow trailing spaces.
 */
intmax_t atomax(const char *s, int base)
{
	char *p;
	intmax_t r;

	errno = 0;
	r = strtoimax(s, &p, base);

	if (errno != 0)
		badnum(s);

	/*
	 * Disallow completely blank strings in non-arithmetic (base != 0)
	 * contexts.
	 */
	if (p == s && base)
		badnum(s);

	while (isspace((unsigned char)*p))
	      p++;

	if (*p)
		badnum(s);

	return r;
}

intmax_t atomax10(const char *s)
{
	return atomax(s, 10);
}

/*
 * Convert a string of digits to an integer, printing an error message on
 * failure.
 */

int
number(const char *s)
{
	intmax_t n = atomax10(s);

	if (n < 0 || n > INT_MAX)
		badnum(s);

	return n;
}


/*
 * Check for a valid number.  This should be elsewhere.
 */

int
is_number(const char *p)
{
	do {
		if (! is_digit(*p))
			return 0;
	} while (*++p != '\0');
	return 1;
}


/*
 * Produce a possibly single quoted string suitable as input to the shell.
 * The return string is allocated on the stack.
 */

char *
single_quote(const char *s) {
	char *p;

	STARTSTACKSTR(p);

	do {
		char *q;
		size_t len;

		len = strchrnul(s, '\'') - s;

		q = p = makestrspace(len + 3, p);

		*q++ = '\'';
		q = mempcpy(q, s, len);
		*q++ = '\'';
		s += len;

		STADJUST(q - p, p);

		len = strspn(s, "'");
		if (!len)
			break;

		q = p = makestrspace(len + 3, p);

		*q++ = '"';
		q = mempcpy(q, s, len);
		*q++ = '"';
		s += len;

		STADJUST(q - p, p);
	} while (*s);

	USTPUTC(0, p);

	return stackblock();
}

/*
 * Like strdup but works with the ash stack.
 */

char *
sstrdup(const char *p)
{
	size_t len = strlen(p) + 1;
	return memcpy(stalloc(len), p, len);
}

/*
 * Wrapper around strcmp for qsort/bsearch/...
 */
int
pstrcmp(const void *a, const void *b)
{
	return strcmp(*(const char *const *) a, *(const char *const *) b);
}

/*
 * Find a string is in a sorted array.
 */
const char *const *
findstring(const char *s, const char *const *array, size_t nmemb)
{
	return bsearch(&s, array, nmemb, sizeof(const char *), pstrcmp);
}
1	/*-
2	* Copyright (c) 1991, 1993
3	* The Regents of the University of California. All rights reserved.
4	* Copyright (c) 1997-2005
5	* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
6	*
7	* This code is derived from software contributed to Berkeley by
8	* Kenneth Almquist.
9	*
10	* Redistribution and use in source and binary forms, with or without
11	* modification, are permitted provided that the following conditions
12	* are met:
13	* 1. Redistributions of source code must retain the above copyright
14	* notice, this list of conditions and the following disclaimer.
15	* 2. Redistributions in binary form must reproduce the above copyright
16	* notice, this list of conditions and the following disclaimer in the
17	* documentation and/or other materials provided with the distribution.
18	* 3. Neither the name of the University nor the names of its contributors
19	* may be used to endorse or promote products derived from this software
20	* without specific prior written permission.
21	*
22	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32	* SUCH DAMAGE.
33	*/
34
35	/*
36	* String functions.
37	*
38	* equal(s1, s2) Return true if strings are equal.
39	* scopy(from, to) Copy a string.
40	* scopyn(from, to, n) Like scopy, but checks for overflow.
41	* number(s) Convert a string of digits to an integer.
42	* is_number(s) Return true if s is a string of digits.
43	*/
44
45	#include <ctype.h>
46	#include <errno.h>
47	#include <inttypes.h>
48	#include <limits.h>
49	#include <stdint.h>
50	#include <stdlib.h>
51	#include "shell.h"
52	#include "syntax.h"
53	#include "error.h"
54	#include "mystring.h"
55	#include "memalloc.h"
56	#include "parser.h"
57	#include "system.h"
58
59
60	char nullstr[1]; /* zero length string */
61	const char spcstr[] = " ";
62	const char snlfmt[] = "%s\n";
63	const char dolatstr[] = { CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=',
64	CTLQUOTEMARK, '\0' };
65	const char illnum[] = "Illegal number: %s";
66	const char homestr[] = "HOME";
67
68	/*
69	* equal - #defined in mystring.h
70	*/
71
72	/*
73	* scopy - #defined in mystring.h
74	*/
75
76
77	#if 0
78	/*
79	* scopyn - copy a string from "from" to "to", truncating the string
80	* if necessary. "To" is always nul terminated, even if
81	* truncation is performed. "Size" is the size of "to".
82	*/
83
84	void
85	scopyn(const char from, char to, int size)
86	{
87
88	while (--size > 0) {
89	if ((to++ = from++) == '\0')
90	return;
91	}
92	*to = '\0';
93	}
94	#endif
95
96
97	/*
98	* prefix -- see if pfx is a prefix of string.
99	*/
100
101	char *
102	prefix(const char string, const char pfx)
103	{
104	while (*pfx) {
105	if (pfx++ != string++)
106	return 0;
107	}
108	return (char *) string;
109	}
110
111	void badnum(const char *s)
112	{
113	sh_error(illnum, s);
114	}
115
116	/*
117	* Convert a string into an integer of type intmax_t. Alow trailing spaces.
118	*/
119	intmax_t atomax(const char *s, int base)
120	{
121	char *p;
122	intmax_t r;
123
124	errno = 0;
125	r = strtoimax(s, &p, base);
126
127	if (errno != 0)
128	badnum(s);
129
130	/*
131	* Disallow completely blank strings in non-arithmetic (base != 0)
132	* contexts.
133	*/
134	if (p == s && base)
135	badnum(s);
136
137	while (isspace((unsigned char)*p))
138	p++;
139
140	if (*p)
141	badnum(s);
142
143	return r;
144	}
145
146	intmax_t atomax10(const char *s)
147	{
148	return atomax(s, 10);
149	}
150
151	/*
152	* Convert a string of digits to an integer, printing an error message on
153	* failure.
154	*/
155
156	int
157	number(const char *s)
158	{
159	intmax_t n = atomax10(s);
160
161	if (n < 0 \|\| n > INT_MAX)
162	badnum(s);
163
164	return n;
165	}
166
167
168
169	/*
170	* Check for a valid number. This should be elsewhere.
171	*/
172
173	int
174	is_number(const char *p)
175	{
176	do {
177	if (! is_digit(*p))
178	return 0;
179	} while (*++p != '\0');
180	return 1;
181	}
182
183
184	/*
185	* Produce a possibly single quoted string suitable as input to the shell.
186	* The return string is allocated on the stack.
187	*/
188
189	char *
190	single_quote(const char *s) {
191	char *p;
192
193	STARTSTACKSTR(p);
194
195	do {
196	char *q;
197	size_t len;
198
199	len = strchrnul(s, '\'') - s;
200
201	q = p = makestrspace(len + 3, p);
202
203	*q++ = '\'';
204	q = mempcpy(q, s, len);
205	*q++ = '\'';
206	s += len;
207
208	STADJUST(q - p, p);
209
210	len = strspn(s, "'");
211	if (!len)
212	break;
213
214	q = p = makestrspace(len + 3, p);
215
216	*q++ = '"';
217	q = mempcpy(q, s, len);
218	*q++ = '"';
219	s += len;
220
221	STADJUST(q - p, p);
222	} while (*s);
223
224	USTPUTC(0, p);
225
226	return stackblock();
227	}
228
229	/*
230	* Like strdup but works with the ash stack.
231	*/
232
233	char *
234	sstrdup(const char *p)
235	{
236	size_t len = strlen(p) + 1;
237	return memcpy(stalloc(len), p, len);
238	}
239
240	/*
241	* Wrapper around strcmp for qsort/bsearch/...
242	*/
243	int
244	pstrcmp(const void a, const void b)
245	{
246	return strcmp((const char const ) a, (const char const ) b);
247	}
248
249	/*
250	* Find a string is in a sorted array.
251	*/
252	const char const
253	findstring(const char s, const char const *array, size_t nmemb)
254	{
255	return bsearch(&s, array, nmemb, sizeof(const char *), pstrcmp);
256	}