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enumdevdir.c: allocate path name buffers from the heap.

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This commit is contained in:
Christian Groessler 2021-06-10 17:15:29 +02:00 committed by Oliver Schmidt
parent c90c3c9133
commit 7f1f0249f3
1 changed files with 37 additions and 9 deletions
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46
samples/enumdevdir.c
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@ -16,31 +16,47 @@
#include <cc65.h>
void printdir (char *newdir)
int printdir (char *newdir)
{
char olddir[FILENAME_MAX];
char curdir[FILENAME_MAX];
char *olddir;
char *curdir;
DIR *dir;
struct dirent *ent;
char *subdirs = NULL;
unsigned dirnum = 0;
unsigned num;
getcwd (olddir, sizeof (olddir));
olddir = malloc (FILENAME_MAX);
if (olddir != NULL) {
perror ("cannot allocate memory");
return 1;
}
getcwd (olddir, FILENAME_MAX);
if (chdir (newdir)) {
/* If chdir() fails we just print the
** directory name - as done for files.
*/
printf (" Dir %s\n", newdir);
return;
free (olddir);
return 0;
}
curdir = malloc (FILENAME_MAX);
if (curdir != NULL) {
perror ("cannot allocate memory");
return 1;
}
/* We call getcwd() in order to print the
** absolute pathname for a subdirectory.
*/
getcwd (curdir, sizeof (curdir));
getcwd (curdir, FILENAME_MAX);
printf (" Dir %s:\n", curdir);
free (curdir);
/* Calling opendir() always with "." avoids
** fiddling around with pathname separators.
@ -65,18 +81,28 @@ void printdir (char *newdir)
closedir (dir);
for (num = 0; num < dirnum; ++num) {
printdir (subdirs + FILENAME_MAX * num);
if (printdir (subdirs + FILENAME_MAX * num))
break;
}
free (subdirs);
chdir (olddir);
free (olddir);
return 0;
}
void main (void)
{
unsigned char device;
char devicedir[FILENAME_MAX];
char *devicedir;
devicedir = malloc (FILENAME_MAX);
if (devicedir != NULL) {
perror ("cannot allocate memory");
return;
}
/* Calling getfirstdevice()/getnextdevice() does _not_ turn on the motor
** of a drive-type device and does _not_ check for a disk in the drive.
@ -88,7 +114,7 @@ void main (void)
/* Calling getdevicedir() _does_ check for a (formatted) disk in a
** floppy-disk-type device and returns NULL if that check fails.
*/
if (getdevicedir (device, devicedir, sizeof (devicedir))) {
if (getdevicedir (device, devicedir, FILENAME_MAX)) {
printdir (devicedir);
} else {
printf (" N/A\n");
@ -100,4 +126,6 @@ void main (void)
if (doesclrscrafterexit ()) {
getchar ();
}
free (devicedir);
}