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
|
/**
* @file
* @brief supports user-supplied data
* @ingroup cgraph_app
*/
/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-v10.html
*
* Contributors: Details at https://graphviz.org
*************************************************************************/
/*
* Written by Emden Gansner
*/
#include "config.h"
#include <cgraph/cgraph.h>
#include <cgraph/ingraphs.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <util/gv_fopen.h>
/* Set next available file.
* If Files is NULL, we just read from stdin.
*/
static void nextFile(ingraph_state * sp)
{
void *rv = NULL;
char *fname;
if (sp->u.Files == NULL) {
if (sp->ctr++ == 0) {
rv = stdin;
}
} else {
while ((fname = sp->u.Files[sp->ctr++])) {
if (*fname == '-') {
rv = stdin;
break;
} else if ((rv = gv_fopen(fname, "r")) != 0)
break;
else {
fprintf(stderr, "Can't open %s\n", sp->u.Files[sp->ctr - 1]);
sp->errors++;
}
}
}
sp->fp = rv;
}
/* Read and return next graph; return NULL if done.
* Read graph from currently open file. If none, open next file.
*/
Agraph_t *nextGraph(ingraph_state * sp)
{
Agraph_t *g;
if (sp->ingraphs) {
g = sp->u.Graphs[sp->ctr];
if (g) sp->ctr++;
return g;
}
if (sp->fp == NULL)
nextFile(sp);
g = NULL;
while (sp->fp != NULL) {
if ((g = sp->readf(fileName(sp), sp->fp)) != 0)
break;
if (sp->u.Files) /* Only close if not using stdin */
(void)fclose(sp->fp);
nextFile(sp);
}
return g;
}
/* Create new ingraph state. If sp is non-NULL, we
* assume user is supplying memory.
*/
static ingraph_state *new_ing(ingraph_state *sp, char **files,
Agraph_t **graphs,
Agraph_t *(*readf)(const char *, void *)) {
if (!sp) {
sp = malloc(sizeof(ingraph_state));
if (!sp) {
fprintf(stderr, "ingraphs: out of memory\n");
return 0;
}
sp->heap = true;
} else
sp->heap = false;
if (graphs) {
sp->ingraphs = 1;
sp->u.Graphs = graphs;
}
else {
sp->ingraphs = 0;
sp->u.Files = files;
}
sp->ctr = 0;
sp->errors = 0;
sp->fp = NULL;
if (!readf) {
if (sp->heap)
free(sp);
fprintf(stderr, "ingraphs: NULL read function\n");
return 0;
}
sp->readf = readf;
return sp;
}
ingraph_state *newIng(ingraph_state *sp, char **files,
Agraph_t *(*readf)(const char *, void *)) {
return new_ing(sp, files, 0, readf);
}
/* Create new ingraph state using supplied graphs. If sp is non-NULL, we
* assume user is supplying memory.
*/
ingraph_state *newIngGraphs(ingraph_state *sp, Agraph_t **graphs,
Agraph_t *(*readf)(const char *, void *)) {
return new_ing(sp, 0, graphs, readf);
}
static Agraph_t *dflt_read(const char *filename, void *fp) {
return agconcat(NULL, filename, fp, NULL);
}
/* At present, we require opf to be non-NULL. In
* theory, we could assume a function agread(FILE*,void*)
*/
ingraph_state *newIngraph(ingraph_state * sp, char **files) {
return newIng(sp, files, dflt_read);
}
/* Close any open files and free discipline
* Free sp if necessary.
*/
void closeIngraph(ingraph_state * sp)
{
if (!sp->ingraphs && sp->u.Files && sp->fp)
(void)fclose(sp->fp);
if (sp->heap)
free(sp);
}
/// Return name of current file being processed.
char *fileName(ingraph_state * sp)
{
char *fname;
if (sp->ingraphs) {
return "<>";
}
else if (sp->u.Files) {
if (sp->ctr) {
fname = sp->u.Files[sp->ctr - 1];
if (*fname == '-')
return "<stdin>";
else
return fname;
} else
return "<>";
} else
return "<stdin>";
}
|
