1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/glpsdf.c Mon Dec 06 13:09:21 2010 +0100
1.3 @@ -0,0 +1,262 @@
1.4 +/* glpsdf.c (plain data file reading routines) */
1.5 +
1.6 +/***********************************************************************
1.7 +* This code is part of GLPK (GNU Linear Programming Kit).
1.8 +*
1.9 +* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
1.10 +* 2009, 2010 Andrew Makhorin, Department for Applied Informatics,
1.11 +* Moscow Aviation Institute, Moscow, Russia. All rights reserved.
1.12 +* E-mail: <mao@gnu.org>.
1.13 +*
1.14 +* GLPK is free software: you can redistribute it and/or modify it
1.15 +* under the terms of the GNU General Public License as published by
1.16 +* the Free Software Foundation, either version 3 of the License, or
1.17 +* (at your option) any later version.
1.18 +*
1.19 +* GLPK is distributed in the hope that it will be useful, but WITHOUT
1.20 +* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.21 +* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
1.22 +* License for more details.
1.23 +*
1.24 +* You should have received a copy of the GNU General Public License
1.25 +* along with GLPK. If not, see <http://www.gnu.org/licenses/>.
1.26 +***********************************************************************/
1.27 +
1.28 +#define GLPSDF_H
1.29 +
1.30 +#define GLP_DATA_DEFINED
1.31 +typedef struct glp_data glp_data;
1.32 +
1.33 +#include "glpapi.h"
1.34 +
1.35 +struct glp_data
1.36 +{ /* plain data file */
1.37 + char *fname;
1.38 + /* name of data file */
1.39 + XFILE *fp;
1.40 + /* stream assigned to data file */
1.41 + void *jump; /* jmp_buf jump; */
1.42 + /* label for go to in case of error */
1.43 + int count;
1.44 + /* line count */
1.45 + int c;
1.46 + /* current character of XEOF */
1.47 + char item[255+1];
1.48 + /* current data item */
1.49 +};
1.50 +
1.51 +static void next_char(glp_data *data);
1.52 +
1.53 +glp_data *glp_sdf_open_file(const char *fname)
1.54 +{ /* open plain data file */
1.55 + glp_data *data = NULL;
1.56 + XFILE *fp;
1.57 + jmp_buf jump;
1.58 + fp = xfopen(fname, "r");
1.59 + if (fp == NULL)
1.60 + { xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
1.61 + goto done;
1.62 + }
1.63 + data = xmalloc(sizeof(glp_data));
1.64 + data->fname = xmalloc(strlen(fname)+1);
1.65 + strcpy(data->fname, fname);
1.66 + data->fp = fp;
1.67 + data->jump = NULL;
1.68 + data->count = 0;
1.69 + data->c = '\n';
1.70 + data->item[0] = '\0';
1.71 + /* read the very first character */
1.72 + if (setjmp(jump))
1.73 + { glp_sdf_close_file(data);
1.74 + data = NULL;
1.75 + goto done;
1.76 + }
1.77 + data->jump = jump;
1.78 + next_char(data);
1.79 + data->jump = NULL;
1.80 +done: return data;
1.81 +}
1.82 +
1.83 +void glp_sdf_set_jump(glp_data *data, void *jump)
1.84 +{ /* set up error handling */
1.85 + data->jump = jump;
1.86 + return;
1.87 +}
1.88 +
1.89 +void glp_sdf_error(glp_data *data, const char *fmt, ...)
1.90 +{ /* print error message */
1.91 + va_list arg;
1.92 + xprintf("%s:%d: ", data->fname, data->count);
1.93 + va_start(arg, fmt);
1.94 + xvprintf(fmt, arg);
1.95 + va_end(arg);
1.96 + if (data->jump == NULL)
1.97 + xerror("");
1.98 + else
1.99 + longjmp(data->jump, 1);
1.100 + /* no return */
1.101 +}
1.102 +
1.103 +void glp_sdf_warning(glp_data *data, const char *fmt, ...)
1.104 +{ /* print warning message */
1.105 + va_list arg;
1.106 + xprintf("%s:%d: warning: ", data->fname, data->count);
1.107 + va_start(arg, fmt);
1.108 + xvprintf(fmt, arg);
1.109 + va_end(arg);
1.110 + return;
1.111 +}
1.112 +
1.113 +static void next_char(glp_data *data)
1.114 +{ /* read next character */
1.115 + int c;
1.116 + if (data->c == XEOF)
1.117 + glp_sdf_error(data, "unexpected end of file\n");
1.118 + else if (data->c == '\n')
1.119 + data->count++;
1.120 + c = xfgetc(data->fp);
1.121 + if (c < 0)
1.122 + { if (xferror(data->fp))
1.123 + glp_sdf_error(data, "read error - %s\n", xerrmsg());
1.124 + else if (data->c == '\n')
1.125 + c = XEOF;
1.126 + else
1.127 + { glp_sdf_warning(data, "missing final end of line\n");
1.128 + c = '\n';
1.129 + }
1.130 + }
1.131 + else if (c == '\n')
1.132 + ;
1.133 + else if (isspace(c))
1.134 + c = ' ';
1.135 + else if (iscntrl(c))
1.136 + glp_sdf_error(data, "invalid control character 0x%02X\n", c);
1.137 + data->c = c;
1.138 + return;
1.139 +}
1.140 +
1.141 +static void skip_pad(glp_data *data)
1.142 +{ /* skip uninteresting characters and comments */
1.143 +loop: while (data->c == ' ' || data->c == '\n')
1.144 + next_char(data);
1.145 + if (data->c == '/')
1.146 + { next_char(data);
1.147 + if (data->c != '*')
1.148 + glp_sdf_error(data, "invalid use of slash\n");
1.149 + next_char(data);
1.150 + for (;;)
1.151 + { if (data->c == '*')
1.152 + { next_char(data);
1.153 + if (data->c == '/')
1.154 + { next_char(data);
1.155 + break;
1.156 + }
1.157 + }
1.158 + next_char(data);
1.159 + }
1.160 + goto loop;
1.161 + }
1.162 + return;
1.163 +}
1.164 +
1.165 +static void next_item(glp_data *data)
1.166 +{ /* read next item */
1.167 + int len;
1.168 + skip_pad(data);
1.169 + len = 0;
1.170 + while (!(data->c == ' ' || data->c == '\n'))
1.171 + { data->item[len++] = (char)data->c;
1.172 + if (len == sizeof(data->item))
1.173 + glp_sdf_error(data, "data item `%.31s...' too long\n",
1.174 + data->item);
1.175 + next_char(data);
1.176 + }
1.177 + data->item[len] = '\0';
1.178 + return;
1.179 +}
1.180 +
1.181 +int glp_sdf_read_int(glp_data *data)
1.182 +{ /* read integer number */
1.183 + int x;
1.184 + next_item(data);
1.185 + switch (str2int(data->item, &x))
1.186 + { case 0:
1.187 + break;
1.188 + case 1:
1.189 + glp_sdf_error(data, "integer `%s' out of range\n",
1.190 + data->item);
1.191 + case 2:
1.192 + glp_sdf_error(data, "cannot convert `%s' to integer\n",
1.193 + data->item);
1.194 + default:
1.195 + xassert(data != data);
1.196 + }
1.197 + return x;
1.198 +}
1.199 +
1.200 +double glp_sdf_read_num(glp_data *data)
1.201 +{ /* read floating-point number */
1.202 + double x;
1.203 + next_item(data);
1.204 + switch (str2num(data->item, &x))
1.205 + { case 0:
1.206 + break;
1.207 + case 1:
1.208 + glp_sdf_error(data, "number `%s' out of range\n",
1.209 + data->item);
1.210 + case 2:
1.211 + glp_sdf_error(data, "cannot convert `%s' to number\n",
1.212 + data->item);
1.213 + default:
1.214 + xassert(data != data);
1.215 + }
1.216 + return x;
1.217 +}
1.218 +
1.219 +const char *glp_sdf_read_item(glp_data *data)
1.220 +{ /* read data item */
1.221 + next_item(data);
1.222 + return data->item;
1.223 +}
1.224 +
1.225 +const char *glp_sdf_read_text(glp_data *data)
1.226 +{ /* read text until end of line */
1.227 + int c, len = 0;
1.228 + for (;;)
1.229 + { c = data->c;
1.230 + next_char(data);
1.231 + if (c == ' ')
1.232 + { /* ignore initial spaces */
1.233 + if (len == 0) continue;
1.234 + /* and multiple ones */
1.235 + if (data->item[len-1] == ' ') continue;
1.236 + }
1.237 + else if (c == '\n')
1.238 + { /* remove trailing space */
1.239 + if (len > 0 && data->item[len-1] == ' ') len--;
1.240 + /* and stop reading */
1.241 + break;
1.242 + }
1.243 + /* add current character to the buffer */
1.244 + data->item[len++] = (char)c;
1.245 + if (len == sizeof(data->item))
1.246 + glp_sdf_error(data, "line too long\n", data->item);
1.247 + }
1.248 + data->item[len] = '\0';
1.249 + return data->item;
1.250 +}
1.251 +
1.252 +int glp_sdf_line(glp_data *data)
1.253 +{ /* determine current line number */
1.254 + return data->count;
1.255 +}
1.256 +
1.257 +void glp_sdf_close_file(glp_data *data)
1.258 +{ /* close plain data file */
1.259 + xfclose(data->fp);
1.260 + xfree(data->fname);
1.261 + xfree(data);
1.262 + return;
1.263 +}
1.264 +
1.265 +/* eof */