lemon-project-template-glpk
view deps/glpk/src/glpsdf.c @ 9:33de93886c88
Import GLPK 4.47
author | Alpar Juttner <alpar@cs.elte.hu> |
---|---|
date | Sun, 06 Nov 2011 20:59:10 +0100 |
parents | |
children |
line source
1 /* glpsdf.c (plain data file reading routines) */
3 /***********************************************************************
4 * This code is part of GLPK (GNU Linear Programming Kit).
5 *
6 * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
7 * 2009, 2010, 2011 Andrew Makhorin, Department for Applied Informatics,
8 * Moscow Aviation Institute, Moscow, Russia. All rights reserved.
9 * E-mail: <mao@gnu.org>.
10 *
11 * GLPK is free software: you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * GLPK is distributed in the hope that it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
18 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
19 * License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with GLPK. If not, see <http://www.gnu.org/licenses/>.
23 ***********************************************************************/
25 #define GLPSDF_H
27 #define GLP_DATA_DEFINED
28 typedef struct glp_data glp_data;
30 #include "glpapi.h"
32 struct glp_data
33 { /* plain data file */
34 char *fname;
35 /* name of data file */
36 XFILE *fp;
37 /* stream assigned to data file */
38 void *jump; /* jmp_buf jump; */
39 /* label for go to in case of error */
40 int count;
41 /* line count */
42 int c;
43 /* current character of XEOF */
44 char item[255+1];
45 /* current data item */
46 };
48 static void next_char(glp_data *data);
50 glp_data *glp_sdf_open_file(const char *fname)
51 { /* open plain data file */
52 glp_data *data = NULL;
53 XFILE *fp;
54 jmp_buf jump;
55 fp = xfopen(fname, "r");
56 if (fp == NULL)
57 { xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
58 goto done;
59 }
60 data = xmalloc(sizeof(glp_data));
61 data->fname = xmalloc(strlen(fname)+1);
62 strcpy(data->fname, fname);
63 data->fp = fp;
64 data->jump = NULL;
65 data->count = 0;
66 data->c = '\n';
67 data->item[0] = '\0';
68 /* read the very first character */
69 if (setjmp(jump))
70 { glp_sdf_close_file(data);
71 data = NULL;
72 goto done;
73 }
74 data->jump = jump;
75 next_char(data);
76 data->jump = NULL;
77 done: return data;
78 }
80 void glp_sdf_set_jump(glp_data *data, void *jump)
81 { /* set up error handling */
82 data->jump = jump;
83 return;
84 }
86 void glp_sdf_error(glp_data *data, const char *fmt, ...)
87 { /* print error message */
88 va_list arg;
89 xprintf("%s:%d: ", data->fname, data->count);
90 va_start(arg, fmt);
91 xvprintf(fmt, arg);
92 va_end(arg);
93 if (data->jump == NULL)
94 xerror("");
95 else
96 longjmp(data->jump, 1);
97 /* no return */
98 }
100 void glp_sdf_warning(glp_data *data, const char *fmt, ...)
101 { /* print warning message */
102 va_list arg;
103 xprintf("%s:%d: warning: ", data->fname, data->count);
104 va_start(arg, fmt);
105 xvprintf(fmt, arg);
106 va_end(arg);
107 return;
108 }
110 static void next_char(glp_data *data)
111 { /* read next character */
112 int c;
113 if (data->c == XEOF)
114 glp_sdf_error(data, "unexpected end of file\n");
115 else if (data->c == '\n')
116 data->count++;
117 c = xfgetc(data->fp);
118 if (c < 0)
119 { if (xferror(data->fp))
120 glp_sdf_error(data, "read error - %s\n", xerrmsg());
121 else if (data->c == '\n')
122 c = XEOF;
123 else
124 { glp_sdf_warning(data, "missing final end of line\n");
125 c = '\n';
126 }
127 }
128 else if (c == '\n')
129 ;
130 else if (isspace(c))
131 c = ' ';
132 else if (iscntrl(c))
133 glp_sdf_error(data, "invalid control character 0x%02X\n", c);
134 data->c = c;
135 return;
136 }
138 static void skip_pad(glp_data *data)
139 { /* skip uninteresting characters and comments */
140 loop: while (data->c == ' ' || data->c == '\n')
141 next_char(data);
142 if (data->c == '/')
143 { next_char(data);
144 if (data->c != '*')
145 glp_sdf_error(data, "invalid use of slash\n");
146 next_char(data);
147 for (;;)
148 { if (data->c == '*')
149 { next_char(data);
150 if (data->c == '/')
151 { next_char(data);
152 break;
153 }
154 }
155 next_char(data);
156 }
157 goto loop;
158 }
159 return;
160 }
162 static void next_item(glp_data *data)
163 { /* read next item */
164 int len;
165 skip_pad(data);
166 len = 0;
167 while (!(data->c == ' ' || data->c == '\n'))
168 { data->item[len++] = (char)data->c;
169 if (len == sizeof(data->item))
170 glp_sdf_error(data, "data item `%.31s...' too long\n",
171 data->item);
172 next_char(data);
173 }
174 data->item[len] = '\0';
175 return;
176 }
178 int glp_sdf_read_int(glp_data *data)
179 { /* read integer number */
180 int x;
181 next_item(data);
182 switch (str2int(data->item, &x))
183 { case 0:
184 break;
185 case 1:
186 glp_sdf_error(data, "integer `%s' out of range\n",
187 data->item);
188 case 2:
189 glp_sdf_error(data, "cannot convert `%s' to integer\n",
190 data->item);
191 default:
192 xassert(data != data);
193 }
194 return x;
195 }
197 double glp_sdf_read_num(glp_data *data)
198 { /* read floating-point number */
199 double x;
200 next_item(data);
201 switch (str2num(data->item, &x))
202 { case 0:
203 break;
204 case 1:
205 glp_sdf_error(data, "number `%s' out of range\n",
206 data->item);
207 case 2:
208 glp_sdf_error(data, "cannot convert `%s' to number\n",
209 data->item);
210 default:
211 xassert(data != data);
212 }
213 return x;
214 }
216 const char *glp_sdf_read_item(glp_data *data)
217 { /* read data item */
218 next_item(data);
219 return data->item;
220 }
222 const char *glp_sdf_read_text(glp_data *data)
223 { /* read text until end of line */
224 int c, len = 0;
225 for (;;)
226 { c = data->c;
227 next_char(data);
228 if (c == ' ')
229 { /* ignore initial spaces */
230 if (len == 0) continue;
231 /* and multiple ones */
232 if (data->item[len-1] == ' ') continue;
233 }
234 else if (c == '\n')
235 { /* remove trailing space */
236 if (len > 0 && data->item[len-1] == ' ') len--;
237 /* and stop reading */
238 break;
239 }
240 /* add current character to the buffer */
241 data->item[len++] = (char)c;
242 if (len == sizeof(data->item))
243 glp_sdf_error(data, "line too long\n", data->item);
244 }
245 data->item[len] = '\0';
246 return data->item;
247 }
249 int glp_sdf_line(glp_data *data)
250 { /* determine current line number */
251 return data->count;
252 }
254 void glp_sdf_close_file(glp_data *data)
255 { /* close plain data file */
256 xfclose(data->fp);
257 xfree(data->fname);
258 xfree(data);
259 return;
260 }
262 /* eof */