1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <assert.h>
4 #include <ctype.h>
5 #include <string.h>
6 #include <stddef.h>
7 #include <stdlib.h>
8
strdup(const char * s)9 char *strdup(const char *s)
10 {
11 if (!ENV_RAMSTAGE)
12 dead_code(); /* This can't be used without malloc(). */
13
14 size_t sz = strlen(s) + 1;
15 char *d = malloc(sz);
16 if (d)
17 memcpy(d, s, sz);
18 return d;
19 }
20
strconcat(const char * s1,const char * s2)21 char *strconcat(const char *s1, const char *s2)
22 {
23 if (!ENV_RAMSTAGE)
24 dead_code(); /* This can't be used without malloc(). */
25
26 size_t sz_1 = strlen(s1);
27 size_t sz_2 = strlen(s2);
28 char *d = malloc(sz_1 + sz_2 + 1);
29 if (d) {
30 memcpy(d, s1, sz_1);
31 memcpy(d + sz_1, s2, sz_2 + 1);
32 }
33 return d;
34 }
35
strnlen(const char * src,size_t max)36 size_t strnlen(const char *src, size_t max)
37 {
38 size_t i = 0;
39 while ((*src++) && (i < max))
40 i++;
41 return i;
42 }
43
strlen(const char * src)44 size_t strlen(const char *src)
45 {
46 size_t i = 0;
47 while (*src++)
48 i++;
49 return i;
50 }
51
strchr(const char * s,int c)52 char *strchr(const char *s, int c)
53 {
54 do {
55 if (*s == c)
56 return (char *)s;
57 } while (*s++);
58
59 return NULL;
60 }
61
strrchr(const char * s,int c)62 char *strrchr(const char *s, int c)
63 {
64 char *p = NULL;
65
66 do {
67 if (*s == c)
68 p = (char *)s;
69 } while (*s++);
70
71 return p;
72 }
73
strncpy(char * to,const char * from,size_t count)74 char *strncpy(char *to, const char *from, size_t count)
75 {
76 char *ret = to;
77 char data;
78
79 while (count > 0) {
80 count--;
81 data = *from++;
82 *to++ = data;
83 if (data == '\0')
84 break;
85 }
86
87 while (count > 0) {
88 count--;
89 *to++ = '\0';
90 }
91 return ret;
92 }
93
strcpy(char * dst,const char * src)94 char *strcpy(char *dst, const char *src)
95 {
96 char *ptr = dst;
97
98 while (*src)
99 *dst++ = *src++;
100 *dst = '\0';
101
102 return ptr;
103 }
104
strcmp(const char * s1,const char * s2)105 int strcmp(const char *s1, const char *s2)
106 {
107 int r;
108
109 while ((r = (*s1 - *s2)) == 0 && *s1) {
110 s1++;
111 s2++;
112 }
113 return r;
114 }
115
strncmp(const char * s1,const char * s2,size_t maxlen)116 int strncmp(const char *s1, const char *s2, size_t maxlen)
117 {
118 size_t i;
119
120 for (i = 0; i < maxlen; i++) {
121 if ((s1[i] != s2[i]) || (s1[i] == '\0'))
122 return s1[i] - s2[i];
123 }
124
125 return 0;
126 }
127
strspn(const char * str,const char * spn)128 size_t strspn(const char *str, const char *spn)
129 {
130 size_t ret = 0;
131
132 while (*str != 0) {
133 const char *p;
134 for (p = spn; *str != *p; p++)
135 if (*p == '\0')
136 return ret;
137 ret++;
138 str++;
139 }
140 return ret;
141 }
142
strcspn(const char * str,const char * spn)143 size_t strcspn(const char *str, const char *spn)
144 {
145 size_t ret = 0;
146
147 while (*str != 0) {
148 const char *p;
149 for (p = spn; *p != '\0'; p++)
150 if (*p == *str)
151 return ret;
152 ret++;
153 str++;
154 }
155 return ret;
156 }
157
strstr(const char * haystack,const char * needle)158 char *strstr(const char *haystack, const char *needle)
159 {
160 size_t needle_len = strlen(needle);
161 for (; *haystack; haystack++) {
162 if (!strncmp(haystack, needle, needle_len))
163 return (char *)haystack;
164 }
165 return NULL;
166 }
167
strtok_r(char * str,const char * delim,char ** ptr)168 char *strtok_r(char *str, const char *delim, char **ptr)
169 {
170 char *start;
171 char *end;
172
173 if (str == NULL)
174 str = *ptr;
175 start = str + strspn(str, delim);
176 if (start[0] == '\0')
177 return NULL;
178
179 end = start + strcspn(start, delim);
180 *ptr = end;
181 if (end[0] != '\0')
182 *(*ptr)++ = '\0';
183 return start;
184 }
185
strtok(char * str,const char * delim)186 char *strtok(char *str, const char *delim)
187 {
188 static char *strtok_ptr;
189
190 return strtok_r(str, delim, &strtok_ptr);
191 }
192
atol(const char * str)193 long atol(const char *str)
194 {
195 long ret = 0;
196 long sign = 1;
197
198 str += strspn(str, " \t\n\r\f\v");
199
200 if (*str == '+') {
201 sign = 1;
202 str++;
203 } else if (*str == '-') {
204 sign = -1;
205 str++;
206 }
207
208 while (isdigit(*str)) {
209 ret *= 10;
210 ret += *str++ - '0';
211 }
212 return ret * sign;
213 }
214