File: Mat_Rewind.3

package info (click to toggle)
libmatio 1.5.2-3
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 24,336 kB
  • ctags: 775
  • sloc: sh: 101,115; ansic: 22,148; makefile: 222
file content (103 lines) | stat: -rw-r--r-- 3,410 bytes parent folder | download
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
.\" Copyright (c) 2011 Christopher C. Hulbert
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY CHRISTOPHER C. HULBERT ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL CHRISTOPHER C. HULBERT OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd April 21, 2011
.Dt MAT_REWIND 3
.Os
.Sh NAME
.Nm Mat_Rewind
.Nd Rewind an open .mat file to the beginning
.Sh SYNOPSIS
.Fd #include <matio.h>
.Ft int
.Fo Mat_Rewind
.Fa "mat_t *matfp"
.Fc
.Sh DESCRIPTION
Rewinds an open .mat file so that
.Xr Mat_VarReadNext 3
or
.Xr Mat_VarReadNextInfo 3
reads the first variable in the file.
.Sh RETURN VALUES
The function returns 0 on success, or -1 on failure.
.Sh EXAMPLES
The following example shows a list of variables in the MAT file, and prompts the
user for the index of the variale to read. If the index is valid, the file is
reset to the beginning, and variables read until the selected index is reached.
.Bd -literal
#include <stdlib.h>
#include <stdio.h>
#include "matio.h"

int
main(int argc,char **argv)
{
    mat_t    *matfp;
    matvar_t *matvar;
    int       idx, num_variables;

    matfp = Mat_Open(argv[1],MAT_ACC_RDONLY);
    if ( NULL == matfp ) {
        fprintf(stderr,"Error opening MAT file %s\n",argv[1]);
        return EXIT_FAILURE;
    }

    idx = 0;
    while ( NULL != (matvar = Mat_VarReadNextInfo(matfp)) ) {
        idx++;
        printf("%3d. %s\n",idx,matvar->name);
        Mat_VarFree(matvar);
    }
    num_variables = idx;
    if ( num_variables > 0 ) {
        printf("Which variable would you like to read? ");
        if ( 0 == fscanf(stdin,"%d",&idx) ) {
            printf("Invalid variable selection!\n");
        } else if ( idx < 1 || idx > num_variables ) {
            fprintf(stderr,"That is an invalid variable index!\n");
        } else {
            int k;
            Mat_Rewind(matfp);
            for ( k = 1; k < idx; k++ ) {
                matvar = Mat_VarReadNextInfo(matfp);
                Mat_VarFree(matvar);
            }
            matvar = Mat_VarReadNext(matfp);
            Mat_VarPrint(matvar,1);
            Mat_VarFree(matvar);
        }
    }

    Mat_Close(matfp);
    return EXIT_SUCCESS;
}
.Ed
.Sh SEE ALSO
.Xr Mat_Open 3 ,
.Xr Mat_Close 3 ,
.Xr Mat_VarReadNext 3 ,
.Xr Mat_VarReadNextInfo 3