54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
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/*
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* Copyright (c) 1989, 1990 by the University of Washington
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*
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* For copying and distribution information, please see the file
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* <uw-copyright.h>.
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*/
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#include <uw-copyright.h>
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#include <stdio.h>
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#include <pfs.h>
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#include <perrno.h>
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#define VLD_NOT_FOUND 1
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/*
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* vl_delete
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*
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* RETURNS: Pointer to the modified list, or NULL on error
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*/
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VLINK
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vl_delete(vll,lname,number)
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VLINK vll; /* List from which link to be removed */
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char *lname; /* Name of the link to remove */
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int number; /* The 1+number of matching links to skip */
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{
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VLINK cl = vll; /* The current link */
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number--; /* Turn it into number to be skipped */
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perrno = 0;
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if(lname == NULL) lname = "";
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while(cl) {
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if((!strcmp(lname,cl->name)) && (number-- == 0)) {
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if(cl->previous == NULL) {
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cl = cl->next;
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/* should really punt the original cl */
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vlfree(vll);
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if(cl) cl->previous = NULL;
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return(cl);
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}
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cl->previous->next = cl->next;
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if(cl->next) cl->next->previous = cl->previous;
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vlfree(cl);
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return(vll);
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}
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cl = cl->next;
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}
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perrno = VLD_NOT_FOUND;
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return(NULL);
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}
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