diff options
Diffstat (limited to 'lisp')
| -rw-r--r-- | lisp/env.c | 151 | ||||
| -rw-r--r-- | lisp/getenv.c | 81 | ||||
| -rw-r--r-- | lisp/setenv.c | 178 |
3 files changed, 259 insertions, 151 deletions
diff --git a/lisp/env.c b/lisp/env.c deleted file mode 100644 index e87793a..0000000 --- a/lisp/env.c +++ /dev/null @@ -1,151 +0,0 @@ -/* - * Provide setenv() and unsetenv() on platforms that don't have them. - * From FreeBSD's libc. - */ - -/* - * Copyright (c) 1987, 1993 - * The Regents of the University of California. All rights reserved. - * - * 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. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. 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. - */ - -/* $XFree86$ */ - - -#include <stdlib.h> -#include <stddef.h> -#include <string.h> - -extern char **environ; - -extern int setenv(const char *name, const char *value, int overwrite); -extern void unsetenv(const char *name); - -static char * -findenv(const char *name, int *offset) -{ - int len, i; - const char *np; - char **p, *cp; - - if (name == NULL || environ == NULL) - return NULL; - - for (np = name; *np && *np != '='; ++np) - continue; - len = np - name; - for (p = environ; (cp = *p) != NULL; ++p) { - for (np = name, i = len; i && *cp; i--) - if (*cp++ != *np++) - break; - if (i == 0 && *cp++ == '=') { - *offset = p - environ; - return cp; - } - } - return NULL; -} - -/* - * setenv -- - * Set the value of the environmental variable "name" to be - * "value". If overwrite is set, replace any current value. - */ - -int -setenv(const char *name, const char *value, int overwrite) -{ - static char **alloced; /* if allocated space before */ - char *c; - int l_value, offset; - - if (*value == '=') /* no '=' in value */ - ++value; - l_value = strlen(value); - if ((c = findenv(name, &offset))) { /* find if already exists */ - if (!overwrite) - return 0; - if (strlen(c) >= l_value) { /* old larger; copy over */ - while ((*c++ = *value++)) - ; - return 0; - } - } else { /* create new slot */ - int cnt; - char **p; - - for (p = environ, cnt = 0; *p; ++p, ++cnt) - ; - if (alloced == environ) { /* just increase size */ - p = (char **)realloc((char *)environ, - sizeof(char *) * (cnt + 2)); - if (!p) - return -1; - alloced = environ = p; - } else { /* get new space */ - /* copy old entries into it */ - p = malloc(sizeof(char *) * (cnt + 2)); - if (!p) - return -1; - memcpy(p, environ, cnt * sizeof(char *)); - alloced = environ = p; - } - environ[cnt + 1] = NULL; - offset = cnt; - } - for (c = (char *)name; *c && *c != '='; ++c) /* no '=' in name */ - ; - if (!(environ[offset] = /* name + '=' + value */ - malloc((int)(c - name) + l_value + 2))) - return -1; - for (c = environ[offset]; (*c = *name++) && *c != '='; ++c) - ; - for (*c++ = '='; (*c++ = *value++); ) - ; - return 0; -} - -/* - * unsetenv(name) -- - * Delete environmental variable "name". - */ - -void -unsetenv(const char *name) -{ - char **p; - int offset; - - while (findenv(name, &offset)) /* if set multiple times */ - for (p = &environ[offset];; ++p) - if (!(*p = *(p + 1))) - break; -} - diff --git a/lisp/getenv.c b/lisp/getenv.c new file mode 100644 index 0000000..fd8482e --- /dev/null +++ b/lisp/getenv.c @@ -0,0 +1,81 @@ +/* $OpenBSD: getenv.c,v 1.10 2010/08/23 22:31:50 millert Exp $ */ +/* + * Copyright (c) 1987, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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. + */ + +#include <stdlib.h> +#include <string.h> + +char *__findenv(const char *name, int len, int *offset); + +/* + * __findenv -- + * Returns pointer to value associated with name, if any, else NULL. + * Starts searching within the environmental array at offset. + * Sets offset to be the offset of the name/value combination in the + * environmental array, for use by putenv(3), setenv(3) and unsetenv(3). + * Explicitly removes '=' in argument name. + * + * This routine *should* be a static; don't use it. + */ +char * +__findenv(const char *name, int len, int *offset) +{ + extern char **environ; + int i; + const char *np; + char **p, *cp; + + if (name == NULL || environ == NULL) + return (NULL); + for (p = environ + *offset; (cp = *p) != NULL; ++p) { + for (np = name, i = len; i && *cp; i--) + if (*cp++ != *np++) + break; + if (i == 0 && *cp++ == '=') { + *offset = p - environ; + return (cp); + } + } + return (NULL); +} + +/* + * getenv -- + * Returns ptr to value associated with name, if any, else NULL. + */ +char * +getenv(const char *name) +{ + int offset = 0; + const char *np; + + for (np = name; *np && *np != '='; ++np) + ; + return (__findenv(name, (int)(np - name), &offset)); +} diff --git a/lisp/setenv.c b/lisp/setenv.c new file mode 100644 index 0000000..089ab92 --- /dev/null +++ b/lisp/setenv.c @@ -0,0 +1,178 @@ +/* $OpenBSD: setenv.c,v 1.13 2010/08/23 22:31:50 millert Exp $ */ +/* + * Copyright (c) 1987 Regents of the University of California. + * All rights reserved. + * + * 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. + */ + +#include <errno.h> +#include <stdlib.h> +#include <string.h> + +char *__findenv(const char *name, int len, int *offset); + +extern char **environ; +static char **lastenv; /* last value of environ */ + +/* + * putenv -- + * Add a name=value string directly to the environmental, replacing + * any current value. + */ +int +putenv(char *str) +{ + char **P, *cp; + size_t cnt; + int offset = 0; + + for (cp = str; *cp && *cp != '='; ++cp) + ; + if (*cp != '=') { + errno = EINVAL; + return (-1); /* missing `=' in string */ + } + + if (__findenv(str, (int)(cp - str), &offset) != NULL) { + environ[offset++] = str; + /* could be set multiple times */ + while (__findenv(str, (int)(cp - str), &offset)) { + for (P = &environ[offset];; ++P) + if (!(*P = *(P + 1))) + break; + } + return (0); + } + + /* create new slot for string */ + for (P = environ; *P != NULL; P++) + ; + cnt = P - environ; + P = (char **)realloc(lastenv, sizeof(char *) * (cnt + 2)); + if (!P) + return (-1); + if (lastenv != environ) + memcpy(P, environ, cnt * sizeof(char *)); + lastenv = environ = P; + environ[cnt] = str; + environ[cnt + 1] = NULL; + return (0); +} + +/* + * setenv -- + * Set the value of the environmental variable "name" to be + * "value". If rewrite is set, replace any current value. + */ +int +setenv(const char *name, const char *value, int rewrite) +{ + char *C, **P; + const char *np; + int l_value, offset = 0; + + for (np = name; *np && *np != '='; ++np) + ; +#ifdef notyet + if (*np) { + errno = EINVAL; + return (-1); /* has `=' in name */ + } +#endif + + l_value = strlen(value); + if ((C = __findenv(name, (int)(np - name), &offset)) != NULL) { + int tmpoff = offset + 1; + if (!rewrite) + return (0); +#if 0 /* XXX - existing entry may not be writable */ + if (strlen(C) >= l_value) { /* old larger; copy over */ + while ((*C++ = *value++)) + ; + return (0); + } +#endif + /* could be set multiple times */ + while (__findenv(name, (int)(np - name), &tmpoff)) { + for (P = &environ[tmpoff];; ++P) + if (!(*P = *(P + 1))) + break; + } + } else { /* create new slot */ + size_t cnt; + + for (P = environ; *P != NULL; P++) + ; + cnt = P - environ; + P = (char **)realloc(lastenv, sizeof(char *) * (cnt + 2)); + if (!P) + return (-1); + if (lastenv != environ) + memcpy(P, environ, cnt * sizeof(char *)); + lastenv = environ = P; + offset = cnt; + environ[cnt + 1] = NULL; + } + if (!(environ[offset] = /* name + `=' + value */ + malloc((size_t)((int)(np - name) + l_value + 2)))) + return (-1); + for (C = environ[offset]; (*C = *name++) && *C != '='; ++C) + ; + for (*C++ = '='; (*C++ = *value++); ) + ; + return (0); +} + +/* + * unsetenv(name) -- + * Delete environmental variable "name". + */ +int +unsetenv(const char *name) +{ + char **P; + const char *np; + int offset = 0; + + if (!name || !*name) { + errno = EINVAL; + return (-1); + } + for (np = name; *np && *np != '='; ++np) + ; + if (*np) { + errno = EINVAL; + return (-1); /* has `=' in name */ + } + + /* could be set multiple times */ + while (__findenv(name, (int)(np - name), &offset)) { + for (P = &environ[offset];; ++P) + if (!(*P = *(P + 1))) + break; + } + return (0); +} |