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/*
* prof_file.c ---- routines that manipulate an individual profile file.
*/
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include "prof_int.h"
#ifndef NO_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifndef NO_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <errno.h>
#if defined(_MSDOS) || defined(_WIN32)
#include <io.h>
#define HAVE_STAT
#define stat _stat
#endif
static int rw_access(filename)
const char *filename;
{
#ifdef HAVE_ACCESS
if (access(filename, W_OK) == 0)
return 1;
else
return 0;
#else
/*
* We're on a substandard OS that doesn't support access. So
* we kludge a test using stdio routines, and hope fopen
* checks the r/w permissions.
*/
FILE *f;
f = fopen(filename, "r+");
if (f) {
fclose(f);
return 1;
}
return 0;
#endif
}
errcode_t profile_open_file(filename, ret_prof)
const char *filename;
prf_file_t *ret_prof;
{
prf_file_t prf;
errcode_t retval;
char *home_env = 0;
int len;
prf = malloc(sizeof(struct _prf_file_t));
if (!prf)
return ENOMEM;
memset(prf, 0, sizeof(struct _prf_file_t));
len = strlen(filename)+1;
if (filename[0] == '~' && filename[1] == '/') {
home_env = getenv("HOME");
if (home_env)
len += strlen(home_env);
}
prf->filename = malloc(len);
if (!prf->filename) {
free(prf);
return ENOMEM;
}
if (home_env) {
strcpy(prf->filename, home_env);
strcat(prf->filename, filename+1);
} else
strcpy(prf->filename, filename);
prf->magic = PROF_MAGIC_FILE;
retval = profile_update_file(prf);
if (retval) {
profile_close_file(prf);
return retval;
}
*ret_prof = prf;
return 0;
}
errcode_t profile_update_file(prf)
prf_file_t prf;
{
errcode_t retval;
#ifdef HAVE_STAT
struct stat st;
#endif
FILE *f;
#ifdef HAVE_STAT
if (stat(prf->filename, &st))
return errno;
if (st.st_mtime == prf->timestamp)
return 0;
if (prf->root) {
profile_free_node(prf->root);
prf->root = 0;
}
if (prf->comment) {
free(prf->comment);
prf->comment = 0;
}
#else
/*
* If we don't have the stat() call, assume that our in-core
* memory image is correct. That is, we won't reread the
* profile file if it changes.
*/
if (prf->root)
return 0;
#endif
errno = 0;
f = fopen(prf->filename, "r");
if (f == NULL) {
retval = errno;
if (retval == 0)
retval = PROF_FAIL_OPEN;
return retval;
}
prf->upd_serial++;
prf->flags = 0;
if (rw_access(prf->filename))
prf->flags |= PROFILE_FILE_RW;
retval = profile_parse_file(f, &prf->root);
fclose(f);
if (retval)
return retval;
#ifdef HAVE_STAT
prf->timestamp = st.st_mtime;
#endif
return 0;
}
errcode_t profile_flush_file(prf)
prf_file_t prf;
{
FILE *f;
char *new_name = 0, *old_name = 0;
errcode_t retval = 0;
if (!prf || prf->magic != PROF_MAGIC_FILE)
return PROF_MAGIC_FILE;
if ((prf->flags & PROFILE_FILE_DIRTY) == 0)
return 0;
retval = ENOMEM;
new_name = malloc(strlen(prf->filename) + 5);
if (!new_name)
goto errout;
old_name = malloc(strlen(prf->filename) + 5);
if (!old_name)
goto errout;
sprintf(new_name, "%s.$$$", prf->filename);
sprintf(old_name, "%s.bak", prf->filename);
errno = 0;
f = fopen(new_name, "w");
if (!f) {
retval = errno;
if (retval == 0)
retval = PROF_FAIL_OPEN;
goto errout;
}
profile_write_tree_file(prf->root, f);
if (fclose(f) != 0) {
retval = errno;
goto errout;
}
unlink(old_name);
if (rename(prf->filename, old_name)) {
retval = errno;
goto errout;
}
if (rename(new_name, prf->filename)) {
retval = errno;
rename(old_name, prf->filename); /* back out... */
goto errout;
}
prf->flags = 0;
if (rw_access(prf->filename))
prf->flags |= PROFILE_FILE_RW;
retval = 0;
errout:
if (new_name)
free(new_name);
if (old_name)
free(old_name);
return retval;
}
void profile_free_file(prf)
prf_file_t prf;
{
if (prf->filename)
free(prf->filename);
if (prf->root)
profile_free_node(prf->root);
if (prf->comment)
free(prf->comment);
prf->magic = 0;
free(prf);
return;
}
errcode_t profile_close_file(prf)
prf_file_t prf;
{
errcode_t retval;
retval = profile_flush_file(prf);
if (retval)
return retval;
profile_free_file(prf);
return 0;
}
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