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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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v_10_09
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1009066a
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1992-06-30
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/*
Listing 3
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "enet_cs.h"
#define NOMOD 65535
FILE *fp;
char filename[100] = "node\"test tester\"::[test]file.txt";
cs_write(long loc, int value)
{
char *sptr;
while ((fp = fopen(filename, "a+")) == NULL){
if (errno != NOMOD) {
if ( (sptr = strerror(errno)) == NULL) {
printf ("Unknown open error.\n");
exit(0);
} else {
sptr = strerror(errno);
perror (sptr);
exit(0);
}
}
};
if (fseek (fp, loc*4, ORIGIN) != 0)
printf ("ERROR: fseek error in cs_write\n");
if (fprintf (fp, "%d ", value) < 0)
printf ("ERROR: cs_write error\n");
fclose (fp);
return;
}
int cs_read(long loc)
{
char *sptr;
int value;
while ((fp = fopen(filename, "r")) == NULL){
if (errno != NOMOD) {
if ((sptr = strerror(errno)) == NULL) {
printf ("Unknown open error.\n");
exit(0);
} else {
sptr = strerror(errno);
perror (sptr);
exit(0);
}
}
};
if (fseek (fp, loc*4, ORIGIN) != 0)
printf ("ERROR: fseek error in cs_read\n");
if (fscanf (fp ,"%d", &value) == EOF)
printf ("ERROR: cs_read error\n");
fclose (fp);
return(value);
}