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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#define NAMSIZ 76
#define SYNC 0x004 /* 1 => window is out of sync */
typedef enum {FALSE, TRUE} bool;
struct iorec {
char *fileptr; /* ptr to file window */
long lcount; /* number of lines printed */
long llimit; /* maximum number of text lines */
FILE *fbuf; /* FILE ptr */
struct iorec *fchain; /* chain to next file */
struct iorec *flev; /* ptr to associated file variable */
char *pfname; /* ptr to name of file */
short funit; /* file status flags */
unsigned short fblk; /* index into active file table */
long fsize; /* size of elements in the file */
char fname[NAMSIZ]; /* name of associated UNIX file */
char buf[BUFSIZ]; /* I/O buffer */
char window[1]; /* file window element */
};
setpos(f, p, m) /* seek on a pascal file */
struct iorec *f;
int p, m;
{
f->funit |= SYNC;
(void) fseek (f->fbuf, (long) p, m);
}
int
sizef(f) /* return size of file */
struct iorec *f;
{
struct stat st;
(void) fstat (fileno(f->fbuf), &st);
return (st.st_size);
}
delete(f) /* remove a link to a file */
struct iorec *f;
{
(void) unlink (f->pfname);
}
bool
readp(filename) /* check if a file may be read */
char *filename;
{
register char *p;
register bool ok;
for(p=filename; *p!=' '; p++) /* pascal strings are space-padded */
;
*p='\0'; /* make it a C-string */
if (access(filename, 04) == 0) /* check if we can read this file */
ok=TRUE;
else
ok=FALSE;
*p=' '; /* "re-pasclify" the string */
return(ok);
}
bool
writep(filename) /* check if a file may be written */
char *filename;
{
register char *p;
register bool ok;
int f;
for(p=filename; *p!=' '; p++) /* pascal strings are space-padded */
;
*p='\0'; /* make it a C-string */
if ((f=creat(filename, 0666)) >= 0) { /* can we create this file?*/
(void) close(f);
ok = TRUE;
} else
ok = FALSE;
*p=' '; /* "re-pasclify" the string */
return(ok);
}
tostdout(f) /* make file appear on stdout */
struct iorec *f;
{
(void) fflush (f->fbuf);
f->fbuf = stdout;
}
tostderr(f) /* make file appear on stderr */
struct iorec *f;
{
(void) fflush (f->fbuf);
f->fbuf = stderr;
}
bool
ttyp(f) /* is file associated with a tty? */
struct iorec *f;
{
if (isatty(fileno(f->fbuf))==1)
return(TRUE);
else
return(FALSE);
}
bool
popenp(f, path, pthpgm) /* can this file be piped into a */
struct iorec *f; /* pager (like more)? */
char *path;
bool pthpgm;
{
char *getenv(), *p;
FILE *popen(), *g;
if (pthpgm==FALSE) { /* -Fpath option used */
for(p=path; *p !=' ' && *p != '\0'; p++)
;
*p = '\0';
} else if ((p=getenv("PAGER"))==NULL) { /* find prefered pager */
for(p=path; *p !=' ' && *p != '\0'; p++)
; /* didn't have one, use */
*p = '\0'; /* the default one for pgm */
} else
path = p; /* default pager from env */
if ((g=popen(path, "w"))!=NULL) { /* get a pipe to the pager */
(void) fflush (f->fbuf); /* make output to f go to */
f->fbuf = g; /* the pager */
return(TRUE);
} else
return(FALSE); /* couldn't do it */
}
pcloseit(f) /* popend stream has to be */
struct iorec *f; /* pclosed */
{
(void) pclose (f->fbuf);
}
bool
envargs(optch, str)
char *optch, *str;
{
char *getenv(), *q;
static char *p;
static int foo = 0;
switch (foo) {
case 0: if ((p=getenv("DVITTY"))==NULL) /* 1st time only, get var */
return(FALSE); /* sorry, no var */
foo++; /* remember we've been here to next call */
/* fall through */
default:
if (*p!=' ' && *p!='\0') /* anything here? */
*optch = *p++; /* yes, it's our optchar */
else
return(FALSE); /* sorry, no more */
q=str; /* get args or whatever */
while (*p!=' ' && *p!='\0')
*q++ = *p++;
*q=' '; /* the pascal program wants ' ' */
while (*p==' ') /* step to next or end */
p++;
return(TRUE);
}
}
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