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editline.c
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Mon, May 20, 10:53

editline.c
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#ifndef lint
static const char RCSid[] = "$Id: editline.c,v 2.9 2013/11/14 02:05:09 greg Exp $";
#endif
/*
* editline.c - routine for editing raw input for rview.
*
* External symbols declared in driver.h
*/
#include "copyright.h"
#include <stdio.h>
#include <string.h>
#include "color.h"
#include "driver.h"
#define iscntrl(c) ((c) < ' ')
#define isblank(c) ((c) == ' ')
#define iserase(c) ((c) == '\b' || (c) == 127)
#define iswerase(c) ((c) == 'W'-'@')
#define iskill(c) ((c) == 'U'-'@' || (c) == 'X'-'@')
void
editline( /* edit input line */
char *buf,
dr_getchf_t *c_get,
dr_comoutf_t *s_put
)
{
static char erases[] = "\b \b";
static char obuf[4];
int i;
int c;
i = 0;
while ((c = (*c_get)()&0177) != '\n' && c != '\r')
if (iserase(c)) { /* single char erase */
if (i > 0) {
(*s_put)(erases);
--i;
}
} else if (iswerase(c)) { /* word erase */
while (i > 0 && isblank(buf[i-1])) {
(*s_put)(erases);
--i;
}
while (i > 0 && !isblank(buf[i-1])) {
(*s_put)(erases);
--i;
}
} else if (iskill(c)) { /* kill line */
while (i > 0) {
(*s_put)(erases);
--i;
}
} else if (iscntrl(c)) { /* control char */
i = 0;
buf[i++] = c;
obuf[0] = '^'; obuf[1] = c|0100; obuf[2] = '\0';
(*s_put)(obuf);
break;
} else { /* regular char */
buf[i++] = c;
obuf[0] = c; obuf[1] = '\0';
(*s_put)(obuf);
}
buf[i] = '\0';
(*s_put)("\n");
}
static char mybuf[512];
void
tocombuf( /* add command(s) to my buffer */
char *b,
struct driver *d
)
{
char *cp;
char *comstart;
for (cp = mybuf; *cp; cp++)
;
comstart = cp;
while ( (*cp++ = *b) )
if (cp >= mybuf+sizeof(mybuf)) {
*comstart = '\0';
return; /* what should I do about this? */
} else if (*b++ == '\n') {
d->inpready++;
comstart = cp;
}
}
int
fromcombuf( /* get command from my buffer */
char *b,
struct driver *d
)
{
char *cp, *cp1;
/* get next command */
for (cp = mybuf; *cp != '\n'; cp++)
if (!*cp)
return(0);
*cp++ = '\0';
#ifdef DEBUG
(*d->comout)(mybuf); /* echo my command */
(*d->comout)("\n");
#endif
/* send it as reply */
strcpy(b, mybuf);
d->inpready--;
/* advance commands */
cp1 = mybuf;
while ((*cp1++ = *cp++))
;
return(1);
}

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