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/*
* LEVEE, or Captain Video; A vi clone
*
* Copyright (c) 1982-2019 David L Parsons
* All rights reserved.
*
* Redistribution and use in source and binary forms, without or
* without modification, are permitted provided that the above
* copyright notice and this paragraph are duplicated in all such
* forms and that any documentation, advertising materials, and
* other materials related to such distribution and use acknowledge
* that the software was developed by David L Parsons (orc@pell.portland.or.us).
* My name may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE.
*/
#include "levee.h"
#include "extern.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
/*
* look up a tag
*/
int
find_tag(char *tag, int sztag, Tag *ret)
{
FILE *tags = fopen("tags", "r");
static char tagline[120];
char *filename;
char *pattern;
int count=0;
if ( tags == 0 ) {
errno = EBADF;
return 0;
}
while ( fgets(tagline, sizeof tagline, tags) ) {
if ( memcmp(tagline, tag, sztag) == 0 && tagline[sztag] == '\t' ) {
filename = strtok(&tagline[sztag+1], "\t");
pattern = strtok(NULL, "\n");
fclose(tags);
if ( filename && pattern ) {
ret->filename = filename;
ret->pattern = pattern;
return 1;
}
errno = EINVAL;
return 0;
}
}
fclose(tags);
errno = ENOENT;
return 0;
}
int
gototag(int fileptr, char *pattern)
{
int samefile = (fileptr == filenm);
int wasmagic = magic;
extern int low; /* from editcor.c, which is where findbounds lives */
magic = 0;
if ( samefile ) {
findbounds(pattern);
if ( low < 0 )
return EOF;
curr = low;
}
else if ( fileptr != F_UNSET ) {
startcmd = pattern;
doinput(fileptr);
}
magic = wasmagic;
return samefile ? SAMEFILE : DIFFERENTFILE;
}
#define NR_CAMEFROM 20
static Camefrom tagstack[NR_CAMEFROM];
static int tag_ptr = 0;
void
push_tag(int filenm, int curr)
{
if ( filenm == F_UNSET )
return;
if ( tag_ptr >= NR_CAMEFROM )
moveleft((void*)&tagstack[1],
(void*)&tagstack[0],
(tag_ptr-1) * sizeof tagstack[0]);
tagstack[tag_ptr].fileno = filenm;
tagstack[tag_ptr].cursor = curr;
if ( tag_ptr < NR_CAMEFROM )
++tag_ptr;
}
Camefrom *
pop_tag()
{
if ( tag_ptr <= 0 )
return 0;
return &tagstack[--tag_ptr];
}
void
zero_tagstack()
{
tag_ptr = 0;
}
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