From b6a3c755c73de6f174b602ee438216af3ab1a596 Mon Sep 17 00:00:00 2001 From: Jim Kingdon Date: Fri, 19 Apr 1991 03:22:06 +0000 Subject: [PATCH] Initial revision --- gdb/putenv.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 gdb/putenv.c diff --git a/gdb/putenv.c b/gdb/putenv.c new file mode 100644 index 0000000000..f7318f0808 --- /dev/null +++ b/gdb/putenv.c @@ -0,0 +1,117 @@ +/****************************************************************/ +/* */ +/* putenv(3) */ +/* */ +/* Change or add an environment entry */ +/* */ +/****************************************************************/ +/* origination 1987-Oct-7 T. Holm */ +/****************************************************************/ + +/* +From pacbell!ames!ll-xn!mit-eddie!uw-beaver!ssc-vax!uvicctr!tholm Wed May 4 23:40:52 1988 +Path: hoptoad!pacbell!ames!ll-xn!mit-eddie!uw-beaver!ssc-vax!uvicctr!tholm +From: tholm@uvicctr.UUCP (Terrence W. Holm) +Newsgroups: comp.os.minix +Subject: putenv(3) +Message-ID: <395@uvicctr.UUCP> +Date: 5 May 88 06:40:52 GMT +Reply-To: tholm@uvicctr.UUCP (Terrence W. Holm) +Organization: University of Victoria, Victoria B.C. Canada +Lines: 296 + + +EFTH Minix report #2 - May 1988 - putenv(3) + + +This is an implementation of putenv(3) that we +wrote for Minix. Please consider this a public +domain program. +*/ + +#include + + +#define PSIZE sizeof(char *) + + +extern char **environ; + + +char *index(); +char *malloc(); + + +/****************************************************************/ +/* */ +/* putenv( entry ) */ +/* */ +/* The "entry" should follow the form */ +/* "NAME=VALUE". This routine will search the */ +/* user environment for "NAME" and replace its */ +/* value with "VALUE". */ +/* */ +/* Note that "entry" is not copied, it is used */ +/* as the environment entry. This means that it */ +/* must not be unallocated or otherwise modifed */ +/* by the caller, unless it is replaced by a */ +/* subsequent putenv(). */ +/* */ +/* If the name is not found in the environment, */ +/* then a new vector of pointers is allocated, */ +/* "entry" is put at the end and the global */ +/* variable "environ" is updated. */ +/* */ +/* This function normally returns NULL, but -1 */ +/* is returned if it can not allocate enough */ +/* space using malloc(3), or "entry" does not */ +/* contain a '='. */ +/* */ +/****************************************************************/ + + +putenv( entry ) + char *entry; + + { + unsigned length; + unsigned size; + char **p; + char **new_environ; + + /* Find the length of the "NAME=" */ + + if ( (length=(unsigned) index(entry,'=')) == NULL ) + return( -1 ); + + length = length - (unsigned) entry + 1; + + + /* Scan through the environment looking for "NAME=" */ + + for ( p=environ; *p != 0 ; p++ ) + if ( strncmp( entry, *p, length ) == 0 ) + { + *p = entry; + return( NULL ); + } + + + /* The name was not found, build a bigger environment */ + + size = p - environ; + + new_environ = (char **) malloc( (size+2)*PSIZE ); + + if ( new_environ == NULL ) + return( -1 ); + + bcopy( (char *) environ, (char *) new_environ, size*PSIZE ); + + new_environ[size] = entry; + new_environ[size+1] = NULL; + + environ = new_environ; + + return(NULL); + } -- 2.34.1