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textlist.c (2402B)

      1 /* $Id$ */
      2 #include "textlist.h"
      3 #include "indep.h"
      4 #include "Str.h"
      5 #include <gc.h>
      6 
      7 /* General doubly linked list */
      8 
      9 ListItem *
     10 newListItem(void *s, ListItem *n, ListItem *p)
     11 {
     12     ListItem *it;
     13     it = New(ListItem);
     14     it->ptr = s;
     15     it->next = n;
     16     it->prev = p;
     17     return it;
     18 }
     19 
     20 GeneralList *
     21 newGeneralList()
     22 {
     23     GeneralList *tl = New(GeneralList);
     24     tl->first = tl->last = NULL;
     25     tl->nitem = 0;
     26     return tl;
     27 }
     28 
     29 void
     30 pushValue(GeneralList *tl, void *s)
     31 {
     32     ListItem *it;
     33     if (s == NULL)
     34 	return;
     35     it = newListItem(s, NULL, tl->last);
     36     if (tl->first == NULL) {
     37 	tl->first = it;
     38 	tl->last = it;
     39 	tl->nitem = 1;
     40     }
     41     else {
     42 	tl->last->next = it;
     43 	tl->last = it;
     44 	tl->nitem++;
     45     }
     46 }
     47 
     48 void *
     49 popValue(GeneralList *tl)
     50 {
     51     ListItem *f;
     52 
     53     if (tl == NULL || tl->first == NULL)
     54 	return NULL;
     55     f = tl->first;
     56     tl->first = f->next;
     57     if (tl->first)
     58 	tl->first->prev = NULL;
     59     else
     60 	tl->last = NULL;
     61     tl->nitem--;
     62     return f->ptr;
     63 }
     64 
     65 void *
     66 rpopValue(GeneralList *tl)
     67 {
     68     ListItem *f;
     69 
     70     if (tl == NULL || tl->last == NULL)
     71 	return NULL;
     72     f = tl->last;
     73     tl->last = f->prev;
     74     if (tl->last)
     75 	tl->last->next = NULL;
     76     else
     77 	tl->first = NULL;
     78     tl->nitem--;
     79     return f->ptr;
     80 }
     81 
     82 void
     83 delValue(GeneralList *tl, ListItem *it)
     84 {
     85     if (it->prev)
     86 	it->prev->next = it->next;
     87     else
     88 	tl->first = it->next;
     89     if (it->next)
     90 	it->next->prev = it->prev;
     91     else
     92 	tl->last = it->prev;
     93     tl->nitem--;
     94 }
     95 
     96 GeneralList *
     97 appendGeneralList(GeneralList *tl, GeneralList *tl2)
     98 {
     99     if (tl && tl2) {
    100 	if (tl2->first) {
    101 	    if (tl->last) {
    102 		tl->last->next = tl2->first;
    103 		tl2->first->prev = tl->last;
    104 		tl->last = tl2->last;
    105 		tl->nitem += tl2->nitem;
    106 	    }
    107 	    else {
    108 		tl->first = tl2->first;
    109 		tl->last = tl2->last;
    110 		tl->nitem = tl2->nitem;
    111 	    }
    112 	}
    113 	tl2->first = tl2->last = NULL;
    114 	tl2->nitem = 0;
    115     }
    116 
    117     return tl;
    118 }
    119 
    120 
    121 /* Line text list */
    122 
    123 TextLine *
    124 newTextLine(Str line, int pos)
    125 {
    126     TextLine *lbuf = New(TextLine);
    127     if (line)
    128 	lbuf->line = line;
    129     else
    130 	lbuf->line = Strnew();
    131     lbuf->pos = pos;
    132     return lbuf;
    133 }
    134 
    135 void
    136 appendTextLine(TextLineList *tl, Str line, int pos)
    137 {
    138     TextLine *lbuf;
    139 
    140     if (tl->last == NULL) {
    141 	pushTextLine(tl, newTextLine(Strdup(line), pos));
    142     }
    143     else {
    144 	lbuf = tl->last->ptr;
    145 	if (lbuf->line)
    146 	    Strcat(lbuf->line, line);
    147 	else
    148 	    lbuf->line = line;
    149 	lbuf->pos += pos;
    150     }
    151 }