1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/***********************************************************************
* *
* 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;
}
|
