gno/bin/vi/dec.c

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/*
* STEVIE - Simply Try this Editor for VI Enthusiasts
*
* Code Contributions By : Tim Thompson twitch!tjt
* Tony Andrews onecom!wldrdg!tony
* G. R. (Fred) Walter watmath!grwalter
*/
#include "stevie.h"
/*
* dec(p)
*
* Decrement the line pointer 'p' crossing line boundaries as necessary. Return
* 1 when crossing a line, -1 when at start of file, 0 otherwise.
*/
int
dec(LPtr *lp)
{
if (lp->index > 0) { /* still within line */
lp->index--;
return 0;
}
if (lp->linep->prev != Filetop->linep) { /* there is a prior line */
lp->linep = lp->linep->prev;
lp->index = strlen(lp->linep->s);
return 1;
}
lp->index = 0; /* stick at first char */
return -1; /* at start of file */
}