46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/*LINTLIBRARY*/
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#ifndef lint
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static char sccsid[] = "@(#)setenv.c 1.1 94/10/31 Copyright 1986 Sun Micro";
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#endif
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/*
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* Copyright (c) 1986 by Sun Microsystems, Inc.
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*/
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static short setenv_made_new_vector= 0;
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extern char *getenv();
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extern char **environ;
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extern char *malloc();
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extern char *strcpy();
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#define NULL 0
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char *setenv(name, value)
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char *name, *value;
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{ char *p= NULL, **q;
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int length= 0, vl;
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if ((p= getenv(name)) == NULL) { /* Allocate new vector */
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for (q= environ; *q != NULL; q++, length++);
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q= (char **)malloc((unsigned)(sizeof(char *)*(length+2)));
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bcopy((char *)environ, ((char *)q)+sizeof(char *), sizeof(char *)*(length+1));
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if (setenv_made_new_vector++)
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free((char *)environ);
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length= strlen(name);
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environ= q;}
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else { /* Find old slot */
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length= strlen(name);
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for (q= environ; *q != NULL; q++)
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if (!strncmp(*q, name, length))
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break;};
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vl= strlen(value);
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if (!p || (length+vl+1 > strlen(p)))
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*q= p= malloc((unsigned)(length+vl+2));
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else
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p= *q;
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(void)strcpy(p, name); p+= length;
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*p++= '=';
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(void)strcpy(p, value);
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return(value);
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}
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