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Diffstat (limited to 'src/clients/ksu/setenv.c')
| -rw-r--r-- | src/clients/ksu/setenv.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/src/clients/ksu/setenv.c b/src/clients/ksu/setenv.c new file mode 100644 index 000000000000..a7895c6b47ca --- /dev/null +++ b/src/clients/ksu/setenv.c @@ -0,0 +1,174 @@ +/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ +/* + * Copyright (c) 1987 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by the University of California, Berkeley. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ +/* + * Copyright (c) 1987 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by the University of California, Berkeley. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +/* based on @(#)setenv.c 5.2 (Berkeley) 6/27/88 */ + +#include "autoconf.h" +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +static char *_findenv(char *, int *); + +#ifndef HAVE_SETENV +extern int setenv(char *, char *, int); +#endif +#ifndef HAVE_UNSETENV +extern void unsetenv(char *); +#endif + +/* + * setenv -- + * Set the value of the environmental variable "name" to be + * "value". If rewrite is set, replace any current value. + */ +#ifndef HAVE_SETENV +int +setenv(name, value, rewrite) + register char *name, *value; + int rewrite; +{ + extern char **environ; + static int alloced; /* if allocated space before */ + register 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 (!rewrite) + return(0); + if (strlen(C) >= l_value) { /* old larger; copy over */ + while ((*C++ = *value++)); + return(0); + } + } + else { /* create new slot */ + register int cnt; + register char **P; + + for (P = environ, cnt = 0; *P; ++P, ++cnt); + if (alloced) { /* just increase size */ + environ = (char **)realloc((char *)environ, + (u_int)(sizeof(char *) * (cnt + 2))); + if (!environ) + return(-1); + } + else { /* get new space */ + alloced = 1; /* copy old entries into it */ + P = (char **)malloc((u_int)(sizeof(char *) * + (cnt + 2))); + if (!P) + return(-1); + memcpy(P, environ, cnt * sizeof(char *)); + environ = P; + } + environ[cnt + 1] = NULL; + offset = cnt; + } + for (C = name; *C && *C != '='; ++C); /* no `=' in name */ + if (!(environ[offset] = /* name + `=' + value */ + malloc((u_int)((int)(C - name) + l_value + 2)))) + return(-1); + for (C = environ[offset]; (*C = *name++) &&( *C != '='); ++C); + for (*C++ = '='; (*C++ = *value++) != NULL;); + return(0); +} +#endif + +/* + * unsetenv(name) -- + * Delete environmental variable "name". + */ +#ifndef HAVE_UNSETENV +void +unsetenv(name) + char *name; +{ + extern char **environ; + register char **P; + int offset; + + while (_findenv(name, &offset)) /* if set multiple times */ + for (P = &environ[offset];; ++P) + if (!(*P = *(P + 1))) + break; +} +#endif + +/* based on @(#)getenv.c 5.5 (Berkeley) 6/27/88 */ + +/* + * getenv -- + * Returns ptr to value associated with name, if any, else NULL. + */ +#ifndef HAVE_GETENV +char * +getenv(name) + char *name; +{ + int offset; + + return(_findenv(name, &offset)); +} +#endif + +/* + * _findenv -- + * Returns pointer to value associated with name, if any, else NULL. + * Sets offset to be the offset of the name/value combination in the + * environmental array, for use by setenv(3) and unsetenv(3). + * Explicitly removes '=' in argument name. + * + */ +static char * +_findenv(name, offset) + register char *name; + int *offset; +{ + extern char **environ; + register int len; + register char **P, *C; + + for (C = name, len = 0; *C && *C != '='; ++C, ++len); + for (P = environ; *P; ++P) + if (!strncmp(*P, name, len)) + if (*(C = *P + len) == '=') { + *offset = P - environ; + return(++C); + } + return(NULL); +} |