| File: | src/lib/libc/stdlib/setenv.c |
| Warning: | line 110, column 7 Although the value stored to 'C' is used in the enclosing expression, the value is never actually read from 'C' |
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| 1 | /* $OpenBSD: setenv.c,v 1.20 2022/08/08 22:40:03 millert Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 1987 Regents of the University of California. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. Neither the name of the University nor the names of its contributors |
| 15 | * may be used to endorse or promote products derived from this software |
| 16 | * without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 28 | * SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include <errno(*__errno()).h> |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | static char **lastenv; /* last value of environ */ |
| 36 | |
| 37 | /* |
| 38 | * putenv -- |
| 39 | * Add a name=value string directly to the environmental, replacing |
| 40 | * any current value. |
| 41 | */ |
| 42 | int |
| 43 | putenv(char *str) |
| 44 | { |
| 45 | char **P, *cp; |
| 46 | size_t cnt = 0; |
| 47 | int offset = 0; |
| 48 | |
| 49 | for (cp = str; *cp && *cp != '='; ++cp) |
| 50 | ; |
| 51 | if (cp == str || *cp != '=') { |
| 52 | /* '=' is the first character of string or is missing. */ |
| 53 | errno(*__errno()) = EINVAL22; |
| 54 | return (-1); |
| 55 | } |
| 56 | |
| 57 | if (__findenv(str, (int)(cp - str), &offset) != NULL((void *)0)) { |
| 58 | environ[offset++] = str; |
| 59 | /* could be set multiple times */ |
| 60 | while (__findenv(str, (int)(cp - str), &offset)) { |
| 61 | for (P = &environ[offset];; ++P) |
| 62 | if (!(*P = *(P + 1))) |
| 63 | break; |
| 64 | } |
| 65 | return (0); |
| 66 | } |
| 67 | |
| 68 | /* create new slot for string */ |
| 69 | if (environ != NULL((void *)0)) { |
| 70 | for (P = environ; *P != NULL((void *)0); P++) |
| 71 | ; |
| 72 | cnt = P - environ; |
| 73 | } |
| 74 | P = reallocarray(lastenv, cnt + 2, sizeof(char *)); |
| 75 | if (!P) |
| 76 | return (-1); |
| 77 | if (lastenv != environ && environ != NULL((void *)0)) |
| 78 | memcpy(P, environ, cnt * sizeof(char *)); |
| 79 | lastenv = environ = P; |
| 80 | environ[cnt] = str; |
| 81 | environ[cnt + 1] = NULL((void *)0); |
| 82 | return (0); |
| 83 | } |
| 84 | DEF_WEAK(putenv)__asm__(".weak " "putenv" " ; " "putenv" " = " "_libc_putenv" ); |
| 85 | |
| 86 | /* |
| 87 | * setenv -- |
| 88 | * Set the value of the environmental variable "name" to be |
| 89 | * "value". If rewrite is set, replace any current value. |
| 90 | */ |
| 91 | int |
| 92 | setenv(const char *name, const char *value, int rewrite) |
| 93 | { |
| 94 | char *C, **P; |
| 95 | const char *np; |
| 96 | int l_value, offset = 0; |
| 97 | |
| 98 | if (!name || !*name) { |
| 99 | errno(*__errno()) = EINVAL22; |
| 100 | return (-1); |
| 101 | } |
| 102 | for (np = name; *np && *np != '='; ++np) |
| 103 | ; |
| 104 | if (*np) { |
| 105 | errno(*__errno()) = EINVAL22; |
| 106 | return (-1); /* has `=' in name */ |
| 107 | } |
| 108 | |
| 109 | l_value = strlen(value); |
| 110 | if ((C = __findenv(name, (int)(np - name), &offset)) != NULL((void *)0)) { |
Although the value stored to 'C' is used in the enclosing expression, the value is never actually read from 'C' | |
| 111 | int tmpoff = offset + 1; |
| 112 | if (!rewrite) |
| 113 | return (0); |
| 114 | #if 0 /* XXX - existing entry may not be writable */ |
| 115 | if (strlen(C) >= l_value) { /* old larger; copy over */ |
| 116 | while ((*C++ = *value++)) |
| 117 | ; |
| 118 | return (0); |
| 119 | } |
| 120 | #endif |
| 121 | /* could be set multiple times */ |
| 122 | while (__findenv(name, (int)(np - name), &tmpoff)) { |
| 123 | for (P = &environ[tmpoff];; ++P) |
| 124 | if (!(*P = *(P + 1))) |
| 125 | break; |
| 126 | } |
| 127 | } else { /* create new slot */ |
| 128 | size_t cnt = 0; |
| 129 | |
| 130 | if (environ != NULL((void *)0)) { |
| 131 | for (P = environ; *P != NULL((void *)0); P++) |
| 132 | ; |
| 133 | cnt = P - environ; |
| 134 | } |
| 135 | P = reallocarray(lastenv, cnt + 2, sizeof(char *)); |
| 136 | if (!P) |
| 137 | return (-1); |
| 138 | if (lastenv != environ && environ != NULL((void *)0)) |
| 139 | memcpy(P, environ, cnt * sizeof(char *)); |
| 140 | lastenv = environ = P; |
| 141 | offset = cnt; |
| 142 | environ[cnt + 1] = NULL((void *)0); |
| 143 | } |
| 144 | if (!(environ[offset] = /* name + `=' + value */ |
| 145 | malloc((int)(np - name) + l_value + 2))) |
| 146 | return (-1); |
| 147 | for (C = environ[offset]; (*C = *name++) && *C != '='; ++C) |
| 148 | ; |
| 149 | for (*C++ = '='; (*C++ = *value++); ) |
| 150 | ; |
| 151 | return (0); |
| 152 | } |
| 153 | DEF_WEAK(setenv)__asm__(".weak " "setenv" " ; " "setenv" " = " "_libc_setenv" ); |
| 154 | |
| 155 | /* |
| 156 | * unsetenv(name) -- |
| 157 | * Delete environmental variable "name". |
| 158 | */ |
| 159 | int |
| 160 | unsetenv(const char *name) |
| 161 | { |
| 162 | char **P; |
| 163 | const char *np; |
| 164 | int offset = 0; |
| 165 | |
| 166 | if (!name || !*name) { |
| 167 | errno(*__errno()) = EINVAL22; |
| 168 | return (-1); |
| 169 | } |
| 170 | for (np = name; *np && *np != '='; ++np) |
| 171 | ; |
| 172 | if (*np) { |
| 173 | errno(*__errno()) = EINVAL22; |
| 174 | return (-1); /* has `=' in name */ |
| 175 | } |
| 176 | |
| 177 | /* could be set multiple times */ |
| 178 | while (__findenv(name, (int)(np - name), &offset)) { |
| 179 | for (P = &environ[offset];; ++P) |
| 180 | if (!(*P = *(P + 1))) |
| 181 | break; |
| 182 | } |
| 183 | return (0); |
| 184 | } |
| 185 | DEF_WEAK(unsetenv)__asm__(".weak " "unsetenv" " ; " "unsetenv" " = " "_libc_unsetenv" ); |