/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 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> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* return an Sfio_t* to a file or string that
*
* splices \\n to single lines
* checks for "..." and '...' spanning newlines
* drops #...\n comments
*
* if <arg> is a file and first line matches
* #!!! <level> <message> !!!
* then error(<lev>,"%s: %s",<arg>,<msg>) called
*
* NOTE: seek disabled and string disciplines cannot be composed
* quoted \n translated to \r
*/
#include <ast.h>
#include <error.h>
#include <tok.h>
typedef struct
{
Sfdisc_t disc;
Sfio_t* sp;
int quote;
int* line;
} Splice_t;
/*
* the splicer
*/
static int
spliceline(Sfio_t* s, int op, void* val, Sfdisc_t* ad)
{
Splice_t* d = (Splice_t*)ad;
register char* b;
register int c;
register int n;
register int q;
register int j;
register char* e;
char* buf;
NoP(val);
switch (op)
{
case SF_CLOSING:
sfclose(d->sp);
return 0;
case SF_DPOP:
free(d);
return 0;
case SF_READ:
do
{
if (!(buf = sfgetr(d->sp, '\n', 0)) && !(buf = sfgetr(d->sp, '\n', -1)))
return 0;
n = sfvalue(d->sp);
q = d->quote;
j = 0;
(*d->line)++;
if (n > 1 && buf[n - 2] == '\\')
{
j = 1;
n -= 2;
if (q == '#')
{
n = 0;
continue;
}
}
else if (q == '#')
{
q = 0;
n = 0;
continue;
}
if (n > 0)
{
e = (b = buf) + n;
while (b < e)
{
if ((c = *b++) == '\\')
b++;
else if (c == q)
q = 0;
else if (!q)
{
if (c == '\'' || c == '"')
q = c;
else if (c == '#' && (b == (buf + 1) || (c = *(b - 2)) == ' ' || c == '\t'))
{
if (buf[n - 1] != '\n')
{
q = '#';
n = b - buf - 2;
}
else if (n = b - buf - 1)
buf[n - 1] = '\n';
break;
}
}
}
if (n > 0)
{
if (!j && buf[n - 1] != '\n' && (s->_flags & SF_STRING))
buf[n++] = '\n';
if (q && buf[n - 1] == '\n')
buf[n - 1] = '\r';
}
}
} while (n <= 0);
sfsetbuf(s, buf, n);
d->quote = q;
return 1;
default:
return 0;
}
}
/*
* open a stream to parse lines
*
* flags: 0 arg: open Sfio_t*
* flags: SF_READ arg: file name
* flags: SF_STRING arg: null terminated char*
*
* if line!=0 then it points to a line count that starts at 0
* and is incremented for each input line
*/
Sfio_t*
tokline(const char* arg, int flags, int* line)
{
Sfio_t* f;
Sfio_t* s;
Splice_t* d;
char* p;
char* e;
static int hidden;
if (!(d = newof(0, Splice_t, 1, 0)))
return 0;
if (!(s = sfopen(NiL, NiL, "s")))
{
free(d);
return 0;
}
if (!(flags & (SF_STRING|SF_READ)))
f = (Sfio_t*)arg;
else if (!(f = sfopen(NiL, arg, (flags & SF_STRING) ? "s" : "r")))
{
free(d);
sfclose(s);
return 0;
}
else if ((p = sfreserve(f, 0, 0)) && sfvalue(f) > 11 && strmatch(p, "#!!! +([-0-9]) *([!\n]) !!!\n*") && (e = strchr(p, '\n')))
{
flags = strtol(p + 5, &p, 10);
error(flags, "%s:%-.*s", arg, e - p - 4, p);
}
d->disc.exceptf = spliceline;
d->sp = f;
*(d->line = line ? line : &hidden) = 0;
sfdisc(s, (Sfdisc_t*)d);
return s;
}