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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#include "sfdchdr.h"
#if _PACKAGE_ast
#include <ast_tty.h>
#include <signal.h>
#endif
/*
* a simple but fast more style pager discipline
* if on sfstdout then sfstdin ops reset the page state
*
* Glenn Fowler
* AT&T Research
*
* @(#)$Id: sfdcmore (AT&T Research) 1998-06-25 $
*/
typedef struct
{
Sfdisc_t disc; /* sfio discipline */
Sfio_t* input; /* tied with this input stream */
Sfio_t* error; /* tied with this error stream */
int rows; /* max rows */
int cols; /* max cols */
int row; /* current row */
int col; /* current col */
int match; /* match length, 0 if none */
char pattern[128]; /* match pattern */
char prompt[1]; /* prompt string */
} More_t;
/*
* more read
* we assume line-at-a-time input
*/
#if __STD_C
static ssize_t moreread(Sfio_t* f, void* buf, size_t n, Sfdisc_t* dp)
#else
static ssize_t moreread(f, buf, n, dp)
Sfio_t* f;
void* buf;
size_t n;
Sfdisc_t* dp;
#endif
{
register More_t* more = (More_t*)dp;
more->match = 0;
more->row = 2;
more->col = 1;
return sfrd(f, buf, n, dp);
}
/*
* output label on wfd and return next char on rfd with no echo
* return < -1 is -(signal + 1)
*/
#if __STD_C
static int ttyquery(Sfio_t* rp, Sfio_t* wp, const char* label, Sfdisc_t* dp)
#else
static int ttyquery(rp, wp, label, dp)
Sfio_t* rp;
Sfio_t* wp;
char* label;
Sfdisc_t* dp;
#endif
{
register int r;
int n;
#ifdef TCSADRAIN
unsigned char c;
struct termios old;
struct termios tty;
int rfd = sffileno(rp);
int wfd = sffileno(rp);
if (!label)
n = 0;
else if (n = strlen(label))
write(wfd, label, n);
tcgetattr(rfd, &old);
tty = old;
tty.c_cc[VTIME] = 0;
tty.c_cc[VMIN] = 1;
tty.c_lflag &= ~(ICANON|ECHO|ECHOK|ISIG);
tcsetattr(rfd, TCSADRAIN, &tty);
if ((r = read(rfd, &c, 1)) == 1)
{
if (c == old.c_cc[VEOF])
r = -1;
else if (c == old.c_cc[VINTR])
r = -(SIGINT + 1);
else if (c == old.c_cc[VQUIT])
r = -(SIGQUIT + 1);
else if (c == '\r')
r = '\n';
else
r = c;
}
tcsetattr(rfd, TCSADRAIN, &old);
if (n)
{
write(wfd, "\r", 1);
while (n-- > 0)
write(wfd, " ", 1);
write(wfd, "\r", 1);
}
#else
register char* s;
if (label && (n = strlen(label)))
sfwr(wp, label, n, dp);
r = (s = sfgetr(rp, '\n', 0)) ? *s : -1;
#endif
return r;
}
/*
* more write
*/
#if __STD_C
static ssize_t morewrite(Sfio_t* f, const Void_t* buf, register size_t n, Sfdisc_t* dp)
#else
static ssize_t morewrite(f, buf, n, dp)
Sfio_t* f;
Void_t* buf;
register size_t n;
Sfdisc_t* dp;
#endif
{
register More_t* more = (More_t*)dp;
register char* b;
register char* s;
register char* e;
register ssize_t w;
register int r;
if (!more->row)
return n;
if (!more->col)
return sfwr(f, buf, n, dp);
w = 0;
b = (char*)buf;
s = b;
e = s + n;
if (more->match)
{
match:
for (r = more->pattern[0];; s++)
{
if (s >= e)
return n;
if (*s == '\n')
b = s + 1;
else if (*s == r && (e - s) >= more->match && !strncmp(s, more->pattern, more->match))
break;
}
s = b;
w += b - (char*)buf;
more->match = 0;
}
while (s < e)
{
switch (*s++)
{
case '\t':
more->col = ((more->col + 8) & ~7) - 1;
/*FALLTHROUGH*/
default:
if (++more->col <= more->cols || s < e && *s == '\n')
continue;
/*FALLTHROUGH*/
case '\n':
more->col = 1;
if (++more->row < more->rows)
continue;
break;
case '\b':
if (more->col > 1)
more->col--;
continue;
case '\r':
more->col = 1;
continue;
}
w += sfwr(f, b, s - b, dp);
b = s;
r = ttyquery(sfstdin, f, more->prompt, dp);
if (r == '/' || r == 'n')
{
if (r == '/')
{
sfwr(f, "/", 1, dp);
if ((s = sfgetr(sfstdin, '\n', 1)) && (n = sfvalue(sfstdin) - 1) > 0)
{
if (n >= sizeof(more->pattern))
n = sizeof(more->pattern) - 1;
memcpy(more->pattern, s, n);
more->pattern[n] = 0;
}
}
if (more->match = strlen(more->pattern))
{
more->row = 1;
more->col = 1;
goto match;
}
}
switch (r)
{
case '\n':
case '\r':
more->row--;
more->col = 1;
break;
case ' ':
more->row = 2;
more->col = 1;
break;
default:
more->row = 0;
return n;
}
}
if (s > b)
w += sfwr(f, b, s - b, dp);
return w;
}
/*
* remove the discipline on close
*/
#if __STD_C
static int moreexcept(Sfio_t* f, int type, Void_t* data, Sfdisc_t* dp)
#else
static int moreexcept(f, type, data, dp)
Sfio_t* f;
int type;
Void_t* data;
Sfdisc_t* dp;
#endif
{
register More_t* more = (More_t*)dp;
if (type == SF_FINAL || type == SF_DPOP)
{
if (f = more->input)
{
more->input = 0;
sfdisc(f, SF_POPDISC);
}
else if (f = more->error)
{
more->error = 0;
sfdisc(f, SF_POPDISC);
}
else
free(dp);
}
else if (type == SF_SYNC)
{
more->match = 0;
more->row = 1;
more->col = 1;
}
return 0;
}
/*
* push the more discipline on f
* if prompt==0 then a default ansi prompt is used
* if rows==0 or cols==0 then they are deterimined from the tty
* if f==sfstdout then input on sfstdin also resets the state
*/
#if __STD_C
int sfdcmore(Sfio_t* f, const char* prompt, int rows, int cols)
#else
int sfdcmore(f, prompt, rows, cols)
Sfio_t* f;
char* prompt;
int rows;
int cols;
#endif
{
register More_t* more;
size_t n;
/*
* this is a writeonly discipline for interactive io
*/
if (!(sfset(f, 0, 0) & SF_WRITE) || !isatty(sffileno(sfstdin)) || !isatty(sffileno(sfstdout)))
return -1;
if (!prompt)
prompt = "\033[7m More\033[m";
n = strlen(prompt) + 1;
if (!(more = (More_t*)malloc(sizeof(More_t) + n)))
return -1;
memset(more, 0, sizeof(*more));
more->disc.readf = moreread;
more->disc.writef = morewrite;
more->disc.exceptf = moreexcept;
memcpy(more->prompt, prompt, n);
if (!rows || !cols)
{
#if _PACKAGE_ast
astwinsize(sffileno(sfstdin), &rows, &cols);
#endif
if (!rows)
rows = 24;
if (!cols)
cols = 80;
}
more->rows = rows;
more->cols = cols;
more->row = 1;
more->col = 1;
if (sfdisc(f, &more->disc) != &more->disc)
{
free(more);
return -1;
}
if (f == sfstdout)
{
if (sfdisc(sfstdin, &more->disc) != &more->disc)
{
sfdisc(f, SF_POPDISC);
return -1;
}
more->input = sfstdin;
if (sfdisc(sfstderr, &more->disc) != &more->disc)
{
sfdisc(f, SF_POPDISC);
return -1;
}
more->error = sfstdin;
}
return 0;
}
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