diff options
author | Erik Andersen <andersen@codepoet.org> | 2000-05-14 04:16:35 +0000 |
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committer | Erik Andersen <andersen@codepoet.org> | 2000-05-14 04:16:35 +0000 |
commit | 64bc6412188b141c010ac3b8e813b837dd991e80 (patch) | |
tree | ffa12b79ea4b13191754f54b872eb1a4f9e3a04b /libc/stdlib/setenv.c |
Initial revision
Diffstat (limited to 'libc/stdlib/setenv.c')
-rw-r--r-- | libc/stdlib/setenv.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/libc/stdlib/setenv.c b/libc/stdlib/setenv.c new file mode 100644 index 000000000..0990fdec2 --- /dev/null +++ b/libc/stdlib/setenv.c @@ -0,0 +1,73 @@ +/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk> + * This file is part of the Linux-8086 C library and is distributed + * under the GNU Library General Public License. + */ +#include <string.h> +#include <stdlib.h> +#include <malloc.h> + +extern char ** environ; +#define ADD_NUM 4 + +int +setenv(var, value, overwrite) +const char * var; +const char * value; +int overwrite; +{ +static char ** mall_env = 0; +static int extras = 0; + char **p, **d; + char * t; + int len; + + len = strlen(var); + + if (!environ) { + environ = (char**)malloc(ADD_NUM * sizeof(char*)); + memset(environ, 0, sizeof(char*)*ADD_NUM); + extras = ADD_NUM; + } + + for(p=environ; *p; p++) + { + if( memcmp(var, *p, len) == 0 && (*p)[len] == '=' ) + { + if (!overwrite) + return -1; + while( p[0] = p[1] ) p++; + extras++; + break; + } + } + + if( extras <= 0 ) /* Need more space */ + { + d = malloc((p-environ+1+ADD_NUM)*sizeof(char*)); + if( d == 0 ) return -1; + + memcpy((void*) d, (void*) environ, (p-environ+1)*sizeof(char*)); + p = d + (p-environ); + extras=ADD_NUM; + + if( mall_env ) free(mall_env); + environ = d; + mall_env = d; + } + + t = malloc(len + 1 + strlen(value) + 1); + if (!t) + return -1; + + strcpy(t, var); + strcat(t, "="); + strcat(t, value); + + *p++ = (char*)t; + *p = '\0'; + extras--; + + return 0; +} + + |