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[PATCH] more Libsysfs updates

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On Thu, Mar 11, 2004 at 02:36:23PM +0100, Kay Sievers wrote:
> On Thu, 2004-03-11 at 15:02, Ananth N Mavinakayanahalli wrote:
> > On Thu, Mar 11, 2004 at 02:04:36PM +0100, Kay Sievers wrote:
> > > On Thu, Mar 11, 2004 at 11:53:50AM +0500, Ananth N Mavinakayanahalli wrote:
> > >
> > > > +#define safestrcpy(to, from)	strncpy(to, from, sizeof(to)-1)
> > > > +#define safestrcat(to, from)	strncat(to, from, sizeof(to) - strlen(to)-1)
> > >
> > > These strings are not terminated with '\0' if from is longer than
> > > the sizeof to.
> >
> > Did not do it on purpose as the "to" elements are either calloc'd or memset to
> > '0' explicitly in the library. Thats the reason I mentioned "scaled down" :)
>
> Ahh, sounds good.
>
> > > > +#define safestrncpy(to, from, maxsize) \
> > > > +do { \
> > > > +	to[maxsize-1] = '\0'; \
> > > > +	strncpy(to, from, maxsize-1); \
> > > > +} while (0)
> > > > +
> > > > +#define safestrncat(to, from, maxsize) \
> > > > +do { \
> > > > +	to[maxsize-1] = '\0'; \
> > > > +	strncat(to, from, maxsize - strlen(to)-1); \
> > > > +} while (0)
> > >
> > > We all expect a similar behavior like strncat/strncpy according to the
> > > names, but these macros are limiting by the target size and do not limit
> > > the count of chars copied.
> > > This is confusing I think and suggest using a different name like
> > > 'safestrcopymax()' or something.
> >
> > Good point.. will make the change
>
> Nice. I've had these *n* names too and I forgot about the logic and only
> 10 days later I introduced a ugly bug cause I can't limit the count of
> copied chars :)

Inlined is the patch for this... applies on the earlier _BIG_ patch.
This commit is contained in:
ananth@in.ibm.com 2004-03-12 00:57:36 -08:00 committed by Greg KH
parent d1fb871d99
commit 656703759d
7 changed files with 40 additions and 40 deletions
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12
libsysfs/sysfs/libsysfs.h
View File

@ -32,16 +32,16 @@
#define safestrcpy(to, from) strncpy(to, from, sizeof(to)-1)
#define safestrcat(to, from) strncat(to, from, sizeof(to) - strlen(to)-1)
#define safestrncpy(to, from, maxsize) \
#define safestrcpymax(to, from, max) \
do { \
to[maxsize-1] = '\0'; \
strncpy(to, from, maxsize-1); \
to[max-1] = '\0'; \
strncpy(to, from, max-1); \
} while (0)
#define safestrncat(to, from, maxsize) \
#define safestrcatmax(to, from, max) \
do { \
to[maxsize-1] = '\0'; \
strncat(to, from, maxsize - strlen(to)-1); \
to[max-1] = '\0'; \
strncat(to, from, max - strlen(to)-1); \
} while (0)
/*

2
libsysfs/sysfs_bus.c
View File

@ -384,7 +384,7 @@ int sysfs_find_driver_bus(const char *driver, char *busname, size_t bsize)
if (drivers != NULL) {
dlist_for_each_data(drivers, curdrv, char) {
if (strcmp(driver, curdrv) == 0) {
safestrncpy(busname,
safestrcpymax(busname,
bus, bsize);
sysfs_close_list(drivers);
sysfs_close_list(buslist);

16
libsysfs/sysfs_class.c
View File

@ -509,16 +509,16 @@ static int get_classdev_path(const char *classname, const char *clsdev,
}
if (strncmp(classname, SYSFS_BLOCK_NAME,
sizeof(SYSFS_BLOCK_NAME)) == 0) {
safestrncat(path, "/", len);
safestrncat(path, SYSFS_BLOCK_NAME, len);
safestrcatmax(path, "/", len);
safestrcatmax(path, SYSFS_BLOCK_NAME, len);
} else {
safestrncat(path, "/", len);
safestrncat(path, SYSFS_CLASS_NAME, len);
safestrncat(path, "/", len);
safestrncat(path, classname, len);
safestrcatmax(path, "/", len);
safestrcatmax(path, SYSFS_CLASS_NAME, len);
safestrcatmax(path, "/", len);
safestrcatmax(path, classname, len);
}
safestrncat(path, "/", len);
safestrncat(path, clsdev, len);
safestrcatmax(path, "/", len);
safestrcatmax(path, clsdev, len);
return 0;
}

2
libsysfs/sysfs_device.c
View File

@ -53,7 +53,7 @@ static int get_dev_driver(struct sysfs_device *dev)
if (c == NULL)
return 1;
*c = '\0';
safestrncat(c, path, (sizeof(devpath) - strlen(devpath)));
safestrcatmax(c, path, (sizeof(devpath) - strlen(devpath)));
drvlist = sysfs_open_subsystem_list(path);
if (drvlist != NULL) {

6
libsysfs/sysfs_dir.c
View File

@ -239,10 +239,10 @@ int sysfs_write_attribute(struct sysfs_attribute *sysattr,
sysattr->value = (char *)realloc
(sysattr->value, length);
sysattr->len = length;
safestrncpy(sysattr->value, new_value, length);
safestrcpymax(sysattr->value, new_value, length);
} else {
/*"length" of the new value is same as old one */
safestrncpy(sysattr->value, new_value, length);
safestrcpymax(sysattr->value, new_value, length);
}
}
@ -348,7 +348,7 @@ int sysfs_read_attribute_value(const char *attrpath,
if (length > vsize)
dprintf("Value length %d is larger than supplied buffer %d\n",
length, vsize);
safestrncpy(value, attr->value, vsize);
safestrcpymax(value, attr->value, vsize);
sysfs_close_attribute(attr);
return 0;

16
libsysfs/sysfs_driver.c
View File

@ -335,14 +335,14 @@ static int get_driver_path(const char *bus, const char *drv,
dprintf("Error getting sysfs mount path\n");
return -1;
}
safestrncat(path, "/", psize);
safestrncat(path, SYSFS_BUS_NAME, psize);
safestrncat(path, "/", psize);
safestrncat(path, bus, psize);
safestrncat(path, "/", psize);
safestrncat(path, SYSFS_DRIVERS_NAME, psize);
safestrncat(path, "/", psize);
safestrncat(path, drv, psize);
safestrcatmax(path, "/", psize);
safestrcatmax(path, SYSFS_BUS_NAME, psize);
safestrcatmax(path, "/", psize);
safestrcatmax(path, bus, psize);
safestrcatmax(path, "/", psize);
safestrcatmax(path, SYSFS_DRIVERS_NAME, psize);
safestrcatmax(path, "/", psize);
safestrcatmax(path, drv, psize);
return 0;
}

26
libsysfs/sysfs_utils.c
View File

@ -67,7 +67,7 @@ static int sysfs_get_fs_mnt_path(const char *fs_type,
char *mnt_path, size_t len)
{
#ifdef __KLIBC__
safestrncpy(mnt_path, "/sys", len);
safestrcpymax(mnt_path, "/sys", len);
return 0;
#else
FILE *mnt;
@ -89,7 +89,7 @@ static int sysfs_get_fs_mnt_path(const char *fs_type,
if (strcmp(mntent->mnt_type, fs_type) == 0) {
dirlen = strlen(mntent->mnt_dir);
if (dirlen <= (len - 1)) {
safestrncpy(mnt_path, mntent->mnt_dir, len);
safestrcpymax(mnt_path, mntent->mnt_dir, len);
} else {
dprintf("Error - mount path too long\n");
ret = -1;
@ -126,7 +126,7 @@ int sysfs_get_mnt_path(char *mnt_path, size_t len)
}
sysfs_path = getenv(SYSFS_PATH_ENV);
if (sysfs_path != NULL) {
safestrncpy(mnt_path, sysfs_path, len);
safestrcpymax(mnt_path, sysfs_path, len);
if ((sysfs_remove_trailing_slash(mnt_path)) != 0)
return 1;
} else
@ -166,7 +166,7 @@ int sysfs_get_name_from_path(const char *path, char *name, size_t len)
}
}
n++;
safestrncpy(name, n, len);
safestrcpymax(name, n, len);
return 0;
}
@ -221,7 +221,7 @@ int sysfs_get_link(const char *path, char *target, size_t len)
} else {
safestrcpy(temp_path, d);
}
safestrncpy(target, temp_path, len);
safestrcpymax(target, temp_path, len);
break;
/*
* relative path
@ -240,12 +240,12 @@ parse_path:
if (*s == '/')
count++;
}
safestrncpy(s, d, (SYSFS_PATH_MAX-strlen(devdir)));
safestrncpy(target, devdir, len);
safestrcpymax(s, d, (SYSFS_PATH_MAX-strlen(devdir)));
safestrcpymax(target, devdir, len);
break;
case '/':
/* absolute path - copy as is */
safestrncpy(target, linkpath, len);
safestrcpymax(target, linkpath, len);
break;
default:
/* relative path from this directory */
@ -257,7 +257,7 @@ parse_path:
} else {
safestrcpy(temp_path, linkpath);
}
safestrncpy(target, temp_path, len);
safestrcpymax(target, temp_path, len);
}
return 0;
}
@ -330,7 +330,7 @@ struct dlist *sysfs_open_subsystem_list(char *name)
dlist_for_each_data(dir->subdirs, cur,
struct sysfs_directory) {
subsys_name = (char *)calloc(1, SYSFS_NAME_LEN);
safestrncpy(subsys_name, cur->name, SYSFS_NAME_LEN);
safestrcpymax(subsys_name, cur->name, SYSFS_NAME_LEN);
dlist_unshift_sorted(list, subsys_name, sort_char);
}
}
@ -345,11 +345,11 @@ struct dlist *sysfs_open_subsystem_list(char *name)
if (c == NULL)
goto out;
*c = '\0';
safestrncpy(c, SYSFS_BLOCK_NAME,
safestrcpymax(c, SYSFS_BLOCK_NAME,
sizeof(sysfs_path) - strlen(sysfs_path));
if ((sysfs_path_is_dir(sysfs_path)) == 0) {
subsys_name = (char *)calloc(1, SYSFS_NAME_LEN);
safestrncpy(subsys_name, SYSFS_BLOCK_NAME,
safestrcpymax(subsys_name, SYSFS_BLOCK_NAME,
SYSFS_NAME_LEN);
dlist_unshift_sorted(list, subsys_name, sort_char);
}
@ -409,7 +409,7 @@ struct dlist *sysfs_open_bus_devices_list(char *name)
dlist_for_each_data(dir->links, cur,
struct sysfs_link) {
device_name = (char *)calloc(1, SYSFS_NAME_LEN);
safestrncpy(device_name, cur->name, SYSFS_NAME_LEN);
safestrcpymax(device_name, cur->name, SYSFS_NAME_LEN);
dlist_unshift_sorted(list, device_name, sort_char);
}
}