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1 /*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
11 *
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * @APPLE_LICENSE_HEADER_END@
21 */
22 /*
23 * string.c - string operations.
24 *
25 * Copyright (c) 1998-2000 Apple Computer, Inc.
26 *
27 * DRI: Josh de Cesare
28 */
29
30 #include "libclite.h"
31
32 /*#if DONT_USE_GCC_BUILT_IN_STRLEN*/
33
34 #define tolower(c) ((int)((c) & ~0x20))
35 #define toupper(c) ((int)((c) | 0x20))
36
37 int strlen(const char *s)
38 {
39 int n;
40
41 n = 0;
42 while (*s++) n++;
43 return(n);
44 }
45
46 /*#endif*/
47
48 int
49 strcmp(const char *s1, const char *s2)
50 {
51 while (*s1 && (*s1 == *s2)) {
52 s1++;
53 s2++;
54 }
55 return (*s1 - *s2);
56 }
57
58 int strncmp(const char *s1, const char *s2, size_t len)
59 {
60 register int n = len;
61 while (--n >= 0 && *s1 == *s2++)
62 if (*s1++ == '\0')
63 return(0);
64 return(n<0 ? 0 : *s1 - *--s2);
65 }
66
67 char *
68 strcpy(char *s1, const char *s2)
69 {
70 register char *ret = s1;
71 while (*s1++ = *s2++)
72 continue;
73 return ret;
74 }
75
76 char *
77 strncpy(char *s1, const char *s2, size_t n)
78 {
79 register char *ret = s1;
80 while (n && (*s1++ = *s2++))
81 n--;
82 if (!n) *s1=0;
83 return ret;
84 }
85
86 int
87 ptol(char *str)
88 {
89 register int c = *str;
90
91 if (c <= '7' && c >= '0')
92 c -= '0';
93 else if (c <= 'h' && c >= 'a')
94 c -= 'a';
95 else c = 0;
96 return c;
97 }
98
99 int
100 atoi(const char *str)
101 {
102 register int sum = 0;
103 while (*str == ' ' || *str == '\t')
104 str++;
105 while (*str >= '0' && *str <= '9') {
106 sum *= 10;
107 sum += *str++ - '0';
108 }
109 return sum;
110 }
111
112
113 char *strncat(char *s1, const char *s2, size_t n)
114 {
115 register char *ret = s1;
116 while (*s1)
117 s1++;
118 while (n-- && *s2)
119 *s1++ = *s2++;
120 *s1 = '\0';
121 return ret;
122 }
123
124 char *strcat(char *s1, const char *s2)
125 {
126 return(strncat(s1, s2, strlen(s2)));
127 }
128
129 /*#if STRNCASECMP*/
130 int strncasecmp(const char *s1, const char *s2, size_t len)
131 {
132 register int n = len;
133 while (--n >= 0 && tolower(*s1) == tolower(*s2++))
134 if (*s1++ == '\0')
135 return(0);
136 return(n<0 ? 0 : tolower(*s1) - tolower(*--s2));
137 }
138 /*#endif*/
139