77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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*/
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/**************************************************************************/
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/* */
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/* Bookkeeping for growing strings */
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/* */
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/**************************************************************************/
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#include <stdlib.h>
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#include "ack.h"
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#include "grows.h"
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void gr_add(growstring *id, char c)
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{
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if ( id->gr_size==id->gr_max) {
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if ( id->gr_size==0 ) { /* The first time */
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id->gr_max= 2*GR_MORE ;
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id->gr_string= getcore(id->gr_max) ;
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} else {
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id->gr_max += GR_MORE ;
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id->gr_string= changecore(id->gr_string,id->gr_max ) ;
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}
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}
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*(id->gr_string+id->gr_size++)= c ;
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}
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void gr_cat(growstring *id, char *string)
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{
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register char *ptr ;
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#ifdef DEBUG
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if ( id->gr_size && *(id->gr_string+id->gr_size-1) ) {
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vprint("Non-zero terminated %*s\n",
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id->gr_size, id->gr_string ) ;
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}
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#endif
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if ( id->gr_size ) id->gr_size-- ;
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ptr=string ;
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for (;;) {
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gr_add(id,*ptr) ;
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if ( *ptr++ ) continue ;
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break ;
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}
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}
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void gr_throw(growstring *id)
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{
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/* Throw the string away */
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if ( id->gr_max==0 ) return ;
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freecore(id->gr_string) ;
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id->gr_string = 0 ;
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id->gr_max=0 ;
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id->gr_size=0 ;
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}
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void gr_init(growstring *id)
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{
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id->gr_size=0 ; id->gr_max=0 ;
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}
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char *gr_final(growstring *id)
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{
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/* Throw away the bookkeeping, adjust the string to its final
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length and return a pointer to a string to be get rid of with
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throws
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*/
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register char *retval ;
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retval= keeps(gr_start(*id)) ;
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gr_throw(id) ;
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return retval ;
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}
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