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back2roots/padua
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padua.7z
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freeze.lzh
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default.c
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C/C++ Source or Header
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1991-11-05
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1KB
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61 lines
#include "freeze.h"
/*-------------------------------*/
/* DEFAULTS FILE HANDLING */
/*-------------------------------*/
#define OK 0
#define FAIL NULL
#define NOFILE ((FILE *) 0)
#define MAXLINE 128
extern int errno;
char *strchr();
static FILE *defd = NOFILE; /* defaults file stream */
int defopen(fname) /* open | reopen | close defaults file */
char *fname;
{
register FILE *fd;
if (!fname) {
if (defd)
fclose(defd);
defd = NOFILE;
return OK;
}
if (!(fd = fopen(fname, "r")))
return errno; /* problems opening file */
defd = fd;
return OK;
}
static char defline[MAXLINE + 1];
char *defread(pattern)
register char *pattern;
{
register sz_patt;
register char *cp;
if (!defd)
return FAIL; /* defaults file not opened */
rewind(defd);
sz_patt = strlen(pattern);
while (fgets(defline, MAXLINE, defd)) {
if (!(cp = strchr(defline, '\n')))
return FAIL; /* line too long */
if (cp - defline < sz_patt)
continue; /* line too short */
*cp = '\0';
if (!strncmp(pattern, defline, sz_patt))
return defline + sz_patt; /* match found */
}
return FAIL; /* no matching lines */
}