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 <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[] = { CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\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;
}


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

int
number(const char *s)
{

	if (! is_number(s))
		sh_error(illnum, s);
	return atoi(s);
}


/*
 * 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	niro	532	/*-
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 <stdlib.h>
46			#include "shell.h"
47			#include "syntax.h"
48			#include "error.h"
49			#include "mystring.h"
50			#include "memalloc.h"
51			#include "parser.h"
52			#include "system.h"
53
54
55			char nullstr[1]; /* zero length string */
56			const char spcstr[] = " ";
57			const char snlfmt[] = "%s\n";
58			const char dolatstr[] = { CTLVAR, VSNORMAL\|VSQUOTE, '@', '=', '\0' };
59			const char illnum[] = "Illegal number: %s";
60			const char homestr[] = "HOME";
61
62			/*
63			* equal - #defined in mystring.h
64			*/
65
66			/*
67			* scopy - #defined in mystring.h
68			*/
69
70
71			#if 0
72			/*
73			* scopyn - copy a string from "from" to "to", truncating the string
74			* if necessary. "To" is always nul terminated, even if
75			* truncation is performed. "Size" is the size of "to".
76			*/
77
78			void
79			scopyn(const char from, char to, int size)
80			{
81
82			while (--size > 0) {
83			if ((to++ = from++) == '\0')
84			return;
85			}
86			*to = '\0';
87			}
88			#endif
89
90
91			/*
92			* prefix -- see if pfx is a prefix of string.
93			*/
94
95			char *
96			prefix(const char string, const char pfx)
97			{
98			while (*pfx) {
99			if (pfx++ != string++)
100			return 0;
101			}
102			return (char *) string;
103			}
104
105
106			/*
107			* Convert a string of digits to an integer, printing an error message on
108			* failure.
109			*/
110
111			int
112			number(const char *s)
113			{
114
115			if (! is_number(s))
116			sh_error(illnum, s);
117			return atoi(s);
118			}
119
120
121
122			/*
123			* Check for a valid number. This should be elsewhere.
124			*/
125
126			int
127			is_number(const char *p)
128			{
129			do {
130			if (! is_digit(*p))
131			return 0;
132			} while (*++p != '\0');
133			return 1;
134			}
135
136
137			/*
138			* Produce a possibly single quoted string suitable as input to the shell.
139			* The return string is allocated on the stack.
140			*/
141
142			char *
143			single_quote(const char *s) {
144			char *p;
145
146			STARTSTACKSTR(p);
147
148			do {
149			char *q;
150			size_t len;
151
152			len = strchrnul(s, '\'') - s;
153
154			q = p = makestrspace(len + 3, p);
155
156			*q++ = '\'';
157			q = mempcpy(q, s, len);
158			*q++ = '\'';
159			s += len;
160
161			STADJUST(q - p, p);
162
163			len = strspn(s, "'");
164			if (!len)
165			break;
166
167			q = p = makestrspace(len + 3, p);
168
169			*q++ = '"';
170			q = mempcpy(q, s, len);
171			*q++ = '"';
172			s += len;
173
174			STADJUST(q - p, p);
175			} while (*s);
176
177			USTPUTC(0, p);
178
179			return stackblock();
180			}
181
182			/*
183			* Like strdup but works with the ash stack.
184			*/
185
186			char *
187			sstrdup(const char *p)
188			{
189			size_t len = strlen(p) + 1;
190			return memcpy(stalloc(len), p, len);
191			}
192
193			/*
194			* Wrapper around strcmp for qsort/bsearch/...
195			*/
196			int
197			pstrcmp(const void a, const void b)
198			{
199			return strcmp((const char const ) a, (const char const ) b);
200			}
201
202			/*
203			* Find a string is in a sorted array.
204			*/
205			const char const
206			findstring(const char s, const char const *array, size_t nmemb)
207			{
208			return bsearch(&s, array, nmemb, sizeof(const char *), pstrcmp);
209			}