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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Kenneth Almquist. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #ifndef lint | |
68de1ca3 AM |
38 | /*static char sccsid[] = "from: @(#)mystring.c 5.1 (Berkeley) 3/7/91";*/ |
39 | static char rcsid[] = "mystring.c,v 1.4 1993/08/01 18:58:05 mycroft Exp"; | |
15637ed4 RG |
40 | #endif /* not lint */ |
41 | ||
42 | /* | |
43 | * String functions. | |
44 | * | |
45 | * equal(s1, s2) Return true if strings are equal. | |
46 | * scopy(from, to) Copy a string. | |
47 | * scopyn(from, to, n) Like scopy, but checks for overflow. | |
48 | * strchr(s, c) Find first occurance of c in s. | |
49 | * bcopy(from, to, n) Copy a block of memory. | |
50 | * number(s) Convert a string of digits to an integer. | |
51 | * is_number(s) Return true if s is a string of digits. | |
52 | */ | |
53 | ||
54 | #include "shell.h" | |
55 | #include "syntax.h" | |
56 | #include "error.h" | |
57 | #include "mystring.h" | |
58 | ||
59 | ||
60 | char nullstr[1]; /* zero length string */ | |
61 | ||
62 | ||
63 | /* | |
64 | * scopyn - copy a string from "from" to "to", truncating the string | |
65 | * if necessary. "To" is always nul terminated, even if | |
66 | * truncation is performed. "Size" is the size of "to". | |
67 | */ | |
68 | ||
69 | void | |
70 | scopyn(from, to, size) | |
71 | register char const *from; | |
72 | register char *to; | |
73 | register int size; | |
74 | { | |
75 | ||
76 | while (--size > 0) { | |
77 | if ((*to++ = *from++) == '\0') | |
78 | return; | |
79 | } | |
80 | *to = '\0'; | |
81 | } | |
82 | ||
83 | ||
84 | /* | |
85 | * strchr - find first occurrence of a character in a string. | |
86 | */ | |
87 | ||
88 | #ifndef SYS5 | |
89 | char * | |
90 | mystrchr(s, charwanted) | |
91 | char const *s; | |
92 | register char charwanted; | |
93 | { | |
94 | register char const *scan; | |
95 | ||
96 | /* | |
97 | * The odd placement of the two tests is so NUL is findable. | |
98 | */ | |
99 | for (scan = s ; *scan != charwanted ; ) /* ++ moved down for opt. */ | |
100 | if (*scan++ == '\0') | |
101 | return NULL; | |
102 | return (char *)scan; | |
103 | } | |
104 | #endif | |
105 | ||
106 | ||
107 | ||
108 | /* | |
109 | * bcopy - copy bytes | |
110 | * | |
111 | * This routine was derived from code by Henry Spencer. | |
112 | */ | |
113 | ||
114 | void | |
115 | mybcopy(src, dst, length) | |
116 | pointer dst; | |
117 | const pointer src; | |
118 | register int length; | |
119 | { | |
120 | register char *d = dst; | |
121 | register char *s = src; | |
122 | ||
123 | while (--length >= 0) | |
124 | *d++ = *s++; | |
125 | } | |
126 | ||
127 | ||
128 | /* | |
129 | * prefix -- see if pfx is a prefix of string. | |
130 | */ | |
131 | ||
132 | int | |
133 | prefix(pfx, string) | |
134 | register char const *pfx; | |
135 | register char const *string; | |
136 | { | |
137 | while (*pfx) { | |
138 | if (*pfx++ != *string++) | |
139 | return 0; | |
140 | } | |
141 | return 1; | |
142 | } | |
143 | ||
144 | ||
145 | /* | |
146 | * Convert a string of digits to an integer, printing an error message on | |
147 | * failure. | |
148 | */ | |
149 | ||
150 | int | |
151 | number(s) | |
152 | const char *s; | |
153 | { | |
154 | ||
155 | if (! is_number(s)) | |
156 | error2("Illegal number", (char *)s); | |
157 | return atoi(s); | |
158 | } | |
159 | ||
160 | ||
161 | ||
162 | /* | |
163 | * Check for a valid number. This should be elsewhere. | |
164 | */ | |
165 | ||
166 | int | |
167 | is_number(p) | |
168 | register const char *p; | |
169 | { | |
170 | do { | |
171 | if (! is_digit(*p)) | |
172 | return 0; | |
173 | } while (*++p != '\0'); | |
174 | return 1; | |
175 | } |