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store.c
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store.c
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/* =====[ store.c ]=========================================================
Description: Store variable for pcalc
Revisions:
REV DATE BY DESCRIPTION
---- -------- ---------- --------------------------------------
0.00 21/9/98 Peter Glen Initial version.
======================================================================= */
/* -------- System includes: -------------------------------------------- */
#include <stdbool.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
/* -------- Includes: --------------------------------------------------- */
#include "store.h"
#include "symbol.h"
#include "hocdecl.h" /* data declarations, function prototypes */
/* -------- Implementation: ---------------------------------------------- */
static char work_str[128];
int store(const char *file, const char *name, long double var)
{
FILE *fp = NULL;
bool found = false;
int namelen;
char tmp[18];
Symbol *ms = lookup_sym("DEBUG_STORE");
if(ms && ms->u.val)
printf("Storing: %s\n", name);
strncpy(tmp, name, 16); // cutted local copy
tmp[16] = '\0';
namelen = strlen(tmp);
fp = fopen(file, "r+");
if(!fp)
{
fp = fopen(file, "w+");
if(ms && ms->u.val)
printf("Creating out file\n");
}
if(!fp)
{
if(ms && ms->u.val)
printf("Could not create file.\n");
return(0);
}
*work_str = 0;
while (1)
{
long pos = ftell(fp);
if(!fgets(work_str, sizeof(work_str), fp))
{
break;
}
//printf("fgets got: %s\n", work_str);
if(*work_str == 0)
{
// printf("empty string\n");
break;
}
if(!strncmp(work_str, tmp, namelen))
{
fseek(fp, pos, SEEK_SET);
found = true;
break;
}
if(feof(fp))
break;
if(ferror(fp))
break;
}
if (found)
{
sprintf(work_str, "%-16s = %-16Le\n", tmp, var);
fputs(work_str, fp);
}
fclose(fp);
return(1);
}
int restore(const char *file, const char *name, long double *var)
{
FILE *fp = NULL;
bool found = false;
int namelen;
char tmp[18];
Symbol *ms = lookup_sym("DEBUG_STORE");
if(ms && ms->u.val )
printf("Restoring: %s\n", name);
strncpy(tmp, name, 16); // cutted local copy
tmp[16] = '\0';
namelen = strlen(tmp);
*var = 0.0;
fp = fopen(file, "rt+");
if(!fp)
return(0);
while (1)
{
if(!fgets(work_str, sizeof(work_str), fp))
break;
if(!strncmp(work_str, tmp, namelen))
{
found = true;
break;
}
if(feof(fp))
break;
if(ferror(fp))
break;
}
if(found)
{
long double dd;
sscanf(work_str, "%*s = %Le", &dd);
*var = dd;
}
fclose(fp);
return(1);
}