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/* @(#)cmain.c 1.7 91/10/24
*
* Compface - 48x48x1 image compression.
*
* Copyright (c) James Ashton - Sydney University - June 1990.
*
* Written 11th November 1889.
*
* Permission is given to distribute these sources, as long as the
* copyright messages are not removed, and no monies are exchanged.
*
* No responsibility is taken for any errors on inaccuracies inherent
* either to the comments or the code of this program, but if reported
* to me, then an attempt will be made to fix them.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "compface.h"
/* the buffer is longer than needed to handle sparse input formats */
#define FACEBUFLEN 2048
char fbuf[FACEBUFLEN];
/* IO file descriptors and their names */
int infile = 0;
char *inname = "<stdin>";
int outfile = 1;
char *outname = "<stdout>";
/* basename of executable */
char *cmdname;
#ifdef HAVE_STRERROR
#ifdef STDC_HEADERS
char *strerrorwrap(int err);
#else
char *strerrorwrap();
#endif
#endif
/* This really shouldn't be done with cpp */
#ifndef HAVE_STRERROR
#define ERR ((errno < sys_nerr) ? sys_errlist[errno] : "")
#else
#define ERR (strerrorwrap(errno))
#endif
#define INITERR(s) {(void)strcpy(fbuf, cmdname); (void)strcat(fbuf, ": ");\
(void)strcat(fbuf, (s));}
#define ADDERR(s) (void)strcat(fbuf, (s));
#define ERROR {(void)strcat(fbuf, "\n");\
(void)write(2, fbuf, strlen(fbuf)); exit(1);}
#define INITWARN(s) {(void)strcpy(fbuf, cmdname);\
(void)strcat(fbuf, ": (warning) ");\
(void)strcat(fbuf, (s));}
#define ADDWARN(s) (void)strcat(fbuf, (s));
#define WARN {(void)strcat(fbuf, "\n"); (void)write(2, fbuf, strlen(fbuf));}
int
main(argc, argv)
int argc;
char *argv[];
{
cmdname = *argv;
while (**argv)
if (*((*argv)++) == '/')
cmdname = *argv; /* find the command's basename */
if (argc > 3)
{
INITERR("usage: ")
ADDERR(cmdname)
ADDERR(" [infile [outfile]]")
ERROR
}
if ((argc > 1) && strcmp(*++argv, "-"))
{
inname = *argv;
if ((infile = open(inname, O_RDONLY)) == -1)
{
INITERR(inname)
ADDERR(": ")
ADDERR(ERR)
ERROR
}
}
if (argc > 2)
{
outname = *++argv;
if ((outfile = open(outname, O_WRONLY | O_CREAT | O_TRUNC, 0644)) == -1)
{
INITERR(outname)
ADDERR(": ")
ADDERR(ERR)
ERROR
}
}
(void) ReadBuf();
switch (compface(fbuf))
{
case -2 : INITERR("internal error")
ERROR
case -1 : INITERR(inname)
ADDERR(": insufficient or invalid data")
ERROR
case 1 : INITWARN(inname)
ADDWARN(": excess data ignored")
WARN
default : ;
}
(void) WriteBuf();
exit(0);
/*NOTREACHED*/
}
int
WriteBuf()
{
register char *s, *t;
register int len;
s = fbuf;
t = s + strlen(s);
while (s < t)
{
if ((len = write(outfile, s, t - s)) == -1)
{
INITERR(outname)
ADDERR(": ")
ADDERR(ERR)
ERROR
}
s += len;
}
return 0;
}
int
ReadBuf()
{
register int count, len;
register char *t;
count = 0;
t = fbuf;
while (len = read(infile, t, FACEBUFLEN - count))
{
if (len == -1)
{
INITERR(inname)
ADDERR(": ")
ADDERR(ERR)
ERROR
}
t += len;
if ((count += len) >= FACEBUFLEN)
{
INITWARN(inname)
ADDWARN(" exceeds internal buffer size. Data may be lost")
WARN
break;
}
}
*t = '\0';
return count;
}
#ifdef HAVE_STRERROR
char *strerrorwrap(err)
int err;
{
char *c = strerror(err);
return ((c) ? (c) : "" );
}
#endif
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