87 lines
1.8 KiB
Plaintext
87 lines
1.8 KiB
Plaintext
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/* RAND-SRC.C - Generate random message bits. */
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/* Copyright (c) 1995-2012 by Radford M. Neal.
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*
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* Permission is granted for anyone to copy, use, modify, and distribute
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* these programs and accompanying documents for any purpose, provided
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* this copyright notice is retained and prominently displayed, and note
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* is made of any changes made to these programs. These programs and
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* documents are distributed without any warranty, express or implied.
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* As the programs were written for research purposes only, they have not
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* been tested to the degree that would be advisable in any important
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* application. All use of these programs is entirely at the user's own
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* risk.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include "open.h"
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#include "rand.h"
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void usage(void);
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/* MAIN PROGRAM. */
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int main
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( int argc,
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char **argv
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)
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{
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int seed, bs, nb;
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char *file, *n_bits;
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char junk;
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int i, j;
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FILE *f;
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if (!(file = argv[1])
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|| !argv[2] || sscanf(argv[2],"%d%c",&seed,&junk)!=1
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|| !(n_bits = argv[3])
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|| argv[4])
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{ usage();
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}
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if (sscanf(n_bits,"%d%c",&nb,&junk)==1)
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{ if (nb<=0) usage();
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bs = 1;
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}
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else if (sscanf(n_bits,"%dx%d%c",&bs,&nb,&junk)==2)
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{ if (nb<=0 || bs<=0) usage();
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}
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else
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{ usage();
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}
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f = open_file_std(file,"w");
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if (f==NULL)
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{ fprintf(stderr,"Can't create source file: %s\n",file);
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exit(1);
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}
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rand_seed(10*seed+2);
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for (i = 0; i<nb; i++)
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{ for (j = 0; j<bs; j++)
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{ fprintf(f,"%d",rand_int(2));
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}
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fprintf(f,"\n");
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}
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if (ferror(f) || fclose(f)!=0)
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{ fprintf(stderr,"Error writing random source blocks to %s\n",file);
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exit(1);
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}
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return 0;
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}
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/* PRINT USAGE MESSAGE AND EXIT. */
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void usage(void)
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{ fprintf(stderr,"Usage: rand-src source-file seed n-bits\n");
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exit(1);
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}
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