diff options
Diffstat (limited to 'support/hypertex/tanmoy/ghostview-1.5-hacked/setenv.c')
-rw-r--r-- | support/hypertex/tanmoy/ghostview-1.5-hacked/setenv.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/support/hypertex/tanmoy/ghostview-1.5-hacked/setenv.c b/support/hypertex/tanmoy/ghostview-1.5-hacked/setenv.c new file mode 100644 index 0000000000..7d84068aa3 --- /dev/null +++ b/support/hypertex/tanmoy/ghostview-1.5-hacked/setenv.c @@ -0,0 +1,107 @@ +/* + * Copyright (c) 1987 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that: (1) source distributions retain this entire copyright + * notice and comment, and (2) distributions including binaries display + * the following acknowledgement: ``This product includes software + * developed by the University of California, Berkeley and its contributors'' + * in the documentation or other materials provided with the distribution + * and in all advertising materials mentioning features or use of this + * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)setenv.c 5.4 (Berkeley) 6/1/90"; +#endif /* LIBC_SCCS and not lint */ + +#include <stdio.h> +#include <sys/types.h> +extern char *malloc(); + +#ifdef BSD4_2 +#define memcpy(a,b,c) bcopy(b,a,c) +#endif + +/* + * setenv -- + * Set the value of the environmental variable "name" to be + * "value". If rewrite is set, replace any current value. + */ +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; + char *_findenv(); + + 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, + (size_t)(sizeof(char *) * (cnt + 2))); + if (!environ) + return(-1); + } + else { /* get new space */ + alloced = 1; /* copy old entries into it */ + P = (char **)malloc((size_t)(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((size_t)((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(name) + char *name; +{ + extern char **environ; + register char **P; + int offset; + char *_findenv(); + + while (_findenv(name, &offset)) /* if set multiple times */ + for (P = &environ[offset];; ++P) + if (!(*P = *(P + 1))) + break; +} |