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Diffstat (limited to 'libbb/xfuncs.c')
-rw-r--r--libbb/xfuncs.c133
1 files changed, 70 insertions, 63 deletions
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 4d81fdc..b2b53a7 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -16,8 +16,12 @@
* succeeded. */
#ifndef DMALLOC
+/* dmalloc provides variants of these that do abort() on failure.
+ * Since dmalloc's prototypes overwrite the impls here as they are
+ * included after these prototypes in libbb.h, all is well.
+ */
#ifdef L_xmalloc
-// Die if we can't allocate size bytes of memory.
+/* Die if we can't allocate size bytes of memory. */
void *xmalloc(size_t size)
{
void *ptr = malloc(size);
@@ -28,9 +32,9 @@ void *xmalloc(size_t size)
#endif
#ifdef L_xrealloc
-// Die if we can't resize previously allocated memory. (This returns a pointer
-// to the new memory, which may or may not be the same as the old memory.
-// It'll copy the contents to a new chunk and free the old one if necessary.)
+/* Die if we can't resize previously allocated memory. (This returns a pointer
+ * to the new memory, which may or may not be the same as the old memory.
+ * It'll copy the contents to a new chunk and free the old one if necessary.) */
void *xrealloc(void *ptr, size_t size)
{
ptr = realloc(ptr, size);
@@ -39,9 +43,11 @@ void *xrealloc(void *ptr, size_t size)
return ptr;
}
#endif
+#endif /* DMALLOC */
+
#ifdef L_xzalloc
-// Die if we can't allocate and zero size bytes of memory.
+/* Die if we can't allocate and zero size bytes of memory. */
void *xzalloc(size_t size)
{
void *ptr = xmalloc(size);
@@ -50,10 +56,8 @@ void *xzalloc(size_t size)
}
#endif
-#endif /* DMALLOC */
-
#ifdef L_xstrdup
-// Die if we can't copy a string to freshly allocated memory.
+/* Die if we can't copy a string to freshly allocated memory. */
char * xstrdup(const char *s)
{
char *t;
@@ -71,8 +75,9 @@ char * xstrdup(const char *s)
#endif
#ifdef L_xstrndup
-// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
-// the (possibly truncated to length n) string into it.
+/* Die if we can't allocate n+1 bytes (space for the null terminator) and copy
+ * the (possibly truncated to length n) string into it.
+ */
char * xstrndup(const char *s, int n)
{
char *t;
@@ -87,8 +92,9 @@ char * xstrndup(const char *s, int n)
#endif
#ifdef L_xfopen
-// Die if we can't open a file and return a FILE * to it.
-// Notice we haven't got xfread(), This is for use with fscanf() and friends.
+/* Die if we can't open a file and return a FILE * to it.
+ * Notice we haven't got xfread(), This is for use with fscanf() and friends.
+ */
FILE *xfopen(const char *path, const char *mode)
{
FILE *fp;
@@ -99,7 +105,7 @@ FILE *xfopen(const char *path, const char *mode)
#endif
#ifdef L_xopen
-// Die if we can't open an existing file and return an fd.
+/* Die if we can't open an existing file and return an fd. */
int xopen(const char *pathname, int flags)
{
if (ENABLE_DEBUG && (flags && O_CREAT))
@@ -110,7 +116,7 @@ int xopen(const char *pathname, int flags)
#endif
#ifdef L_xopen3
-// Die if we can't open a new file and return an fd.
+/* Die if we can't open a new file and return an fd. */
int xopen3(const char *pathname, int flags, int mode)
{
int ret;
@@ -124,7 +130,7 @@ int xopen3(const char *pathname, int flags, int mode)
#endif
#ifdef L_xread
-// Die with an error message if we can't read the entire buffer.
+/* Die with an error message if we can't read the entire buffer. */
void xread(int fd, void *buf, size_t count)
{
while (count) {
@@ -139,7 +145,7 @@ void xread(int fd, void *buf, size_t count)
#endif
#ifdef L_xwrite
-// Die with an error message if we can't write the entire buffer.
+/* Die with an error message if we can't write the entire buffer. */
void xwrite(int fd, void *buf, size_t count)
{
while (count) {
@@ -154,7 +160,7 @@ void xwrite(int fd, void *buf, size_t count)
#endif
#ifdef L_xlseek
-// Die with an error message if we can't lseek to the right spot.
+/* Die with an error message if we can't lseek to the right spot. */
void xlseek(int fd, off_t offset, int whence)
{
if (offset != lseek(fd, offset, whence)) bb_error_msg_and_die("lseek");
@@ -162,7 +168,7 @@ void xlseek(int fd, off_t offset, int whence)
#endif
#ifdef L_xread_char
-// Die with an error message if we can't read one character.
+/* Die with an error message if we can't read one character. */
unsigned char xread_char(int fd)
{
char tmp;
@@ -174,7 +180,7 @@ unsigned char xread_char(int fd)
#endif
#ifdef L_xferror
-// Die with supplied error message if this FILE * has ferror set.
+/* Die with supplied error message if this FILE * has ferror set. */
void xferror(FILE *fp, const char *fn)
{
if (ferror(fp)) {
@@ -184,7 +190,7 @@ void xferror(FILE *fp, const char *fn)
#endif
#ifdef L_xferror_stdout
-// Die with an error message if stdout has ferror set.
+/* Die with an error message if stdout has ferror set. */
void xferror_stdout(void)
{
xferror(stdout, bb_msg_standard_output);
@@ -192,7 +198,7 @@ void xferror_stdout(void)
#endif
#ifdef L_xfflush_stdout
-// Die with an error message if we have trouble flushing stdout.
+/* Die with an error message if we have trouble flushing stdout. */
void xfflush_stdout(void)
{
if (fflush(stdout)) {
@@ -202,24 +208,25 @@ void xfflush_stdout(void)
#endif
#ifdef L_spawn
-// This does a fork/exec in one call, using vfork(). Return PID of new child,
-// -1 for failure. Runs argv[0], searching path if that has no / in it.
+/* This does a fork/exec in one call, using vfork(). Return PID of new child,
+ * -1 for failure. Runs argv[0], searching path if that has no / in it.
+ */
pid_t spawn(char **argv)
{
static int failed;
pid_t pid;
void *app = ENABLE_FEATURE_SH_STANDALONE_SHELL ? find_applet_by_name(argv[0]) : 0;
- // Be nice to nommu machines.
+ /* Be nice to nommu machines. */
failed = 0;
pid = vfork();
if (pid < 0) return pid;
if (!pid) {
execvp(app ? CONFIG_BUSYBOX_EXEC_PATH : *argv, argv);
- // We're sharing a stack with blocked parent, let parent know we failed
- // and then exit to unblock parent (but don't run atexit() stuff, which
- // would screw up parent.)
+ /* We're sharing a stack with blocked parent, let parent know we failed
+ * and then exit to unblock parent (but don't run atexit() stuff, which
+ would screw up parent.) */
failed = -1;
_exit(0);
@@ -229,7 +236,7 @@ pid_t spawn(char **argv)
#endif
#ifdef L_xspawn
-// Die with an error message if we can't spawn a child process.
+/* Die with an error message if we can't spawn a child process. */
pid_t xspawn(char **argv)
{
pid_t pid = spawn(argv);
@@ -239,7 +246,7 @@ pid_t xspawn(char **argv)
#endif
#ifdef L_wait4
-// Wait for the specified child PID to exit, returning child's error return.
+/* Wait for the specified child PID to exit, returning child's error return. */
int wait4pid(int pid)
{
int status;
@@ -252,9 +259,9 @@ int wait4pid(int pid)
#endif
#ifdef L_itoa
-// Convert unsigned integer to ascii, writing into supplied buffer. A
-// truncated result is always null terminated (unless buflen is 0), and
-// contains the first few digits of the result ala strncpy.
+/* Convert unsigned integer to ascii, writing into supplied buffer. A
+ * truncated result is always null terminated (unless buflen is 0), and
+ * contains the first few digits of the result ala strncpy. */
void utoa_to_buf(unsigned n, char *buf, unsigned buflen)
{
int i, out = 0;
@@ -272,7 +279,7 @@ void utoa_to_buf(unsigned n, char *buf, unsigned buflen)
}
}
-// Convert signed integer to ascii, like utoa_to_buf()
+/* Convert signed integer to ascii, like utoa_to_buf() */
void itoa_to_buf(int n, char *buf, unsigned buflen)
{
if (buflen && n<0) {
@@ -283,16 +290,16 @@ void itoa_to_buf(int n, char *buf, unsigned buflen)
utoa_to_buf((unsigned)n, buf, buflen);
}
-// The following two functions use a static buffer, so calling either one a
-// second time will overwrite previous results.
-//
-// The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
-// Int should always be 32 bits on any remotely Unix-like system, see
-// http://www.unix.org/whitepapers/64bit.html for the reasons why.
-
+/* The following two functions use a static buffer, so calling either one a
+ * second time will overwrite previous results.
+ *
+ * The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
+ * Int should always be 32 bits on any remotely Unix-like system, see
+ * http://www.unix.org/whitepapers/64bit.html for the reasons why.
+*/
static char local_buf[12];
-// Convert unsigned integer to ascii using a static buffer (returned).
+/* Convert unsigned integer to ascii using a static buffer (returned). */
char *utoa(unsigned n)
{
utoa_to_buf(n, local_buf, sizeof(local_buf));
@@ -300,7 +307,7 @@ char *utoa(unsigned n)
return local_buf;
}
-// Convert signed integer to ascii using a static buffer (returned).
+/* Convert signed integer to ascii using a static buffer (returned). */
char *itoa(int n)
{
itoa_to_buf(n, local_buf, sizeof(local_buf));
@@ -310,15 +317,15 @@ char *itoa(int n)
#endif
#ifdef L_setuid
-// Die with an error message if we can't set gid. (Because resource limits may
-// limit this user to a given number of processes, and if that fills up the
-// setgid() will fail and we'll _still_be_root_, which is bad.)
+/* Die with an error message if we can't set gid. (Because resource limits may
+ * limit this user to a given number of processes, and if that fills up the
+ * setgid() will fail and we'll _still_be_root_, which is bad.) */
void xsetgid(gid_t gid)
{
if (setgid(gid)) bb_error_msg_and_die("setgid");
}
-// Die with an error message if we cant' set uid. (See xsetgid() for why.)
+/* Die with an error message if we cant' set uid. (See xsetgid() for why.) */
void xsetuid(uid_t uid)
{
if (setuid(uid)) bb_error_msg_and_die("setuid");
@@ -326,31 +333,31 @@ void xsetuid(uid_t uid)
#endif
#ifdef L_fdlength
-// Return how long the file at fd is, if there's any way to determine it.
+/* Return how long the file at fd is, if there's any way to determine it. */
off_t fdlength(int fd)
{
off_t bottom = 0, top = 0, pos;
long size;
- // If the ioctl works for this, return it.
+ /* If the ioctl works for this, return it. */
if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
- // If not, do a binary search for the last location we can read. (Some
- // block devices don't do BLKGETSIZE right.)
+ /* If not, do a binary search for the last location we can read. (Some
+ * block devices don't do BLKGETSIZE right.) */
do {
char temp;
pos = bottom + (top - bottom) / 2;;
- // If we can read from the current location, it's bigger.
+ /* If we can read from the current location, it's bigger. */
if (lseek(fd, pos, 0)>=0 && safe_read(fd, &temp, 1)==1) {
if (bottom == top) bottom = top = (top+1) * 2;
else bottom = pos;
- // If we can't, it's smaller.
+ /* If we can't, it's smaller. */
} else {
if (bottom == top) {
@@ -366,8 +373,8 @@ off_t fdlength(int fd)
#endif
#ifdef L_xasprintf
-// Die with an error message if we can't malloc() enough space and do an
-// sprintf() into that space.
+/* Die with an error message if we can't malloc() enough space and do an
+ * sprintf() into that space. */
char *xasprintf(const char *format, ...)
{
va_list p;
@@ -396,8 +403,8 @@ char *xasprintf(const char *format, ...)
#endif
#ifdef L_xprint_and_close_file
-// Die with an error message if we can't copy an entire FILE * to stdout, then
-// close that file.
+/* Die with an error message if we can't copy an entire FILE * to stdout, then
+ * close that file. */
void xprint_and_close_file(FILE *file)
{
// copyfd outputs error messages for us.
@@ -408,7 +415,7 @@ void xprint_and_close_file(FILE *file)
#endif
#ifdef L_xchdir
-// Die if we can't chdir to a new path.
+/* Die if we can't chdir to a new path. */
void xchdir(const char *path)
{
if (chdir(path))
@@ -417,7 +424,7 @@ void xchdir(const char *path)
#endif
#ifdef L_warn_opendir
-// Print a warning message if opendir() fails, but don't die.
+/* Print a warning message if opendir() fails, but don't die. */
DIR *warn_opendir(const char *path)
{
DIR *dp;
@@ -431,7 +438,7 @@ DIR *warn_opendir(const char *path)
#endif
#ifdef L_xopendir
-// Die with an error message if opendir() fails.
+/* Die with an error message if opendir() fails. */
DIR *xopendir(const char *path)
{
DIR *dp;
@@ -444,7 +451,7 @@ DIR *xopendir(const char *path)
#ifdef L_xdaemon
#ifndef BB_NOMMU
-// Die with an error message if we can't daemonize.
+/* Die with an error message if we can't daemonize. */
void xdaemon(int nochdir, int noclose)
{
if (daemon(nochdir, noclose)) bb_perror_msg_and_die("daemon");
@@ -453,7 +460,7 @@ void xdaemon(int nochdir, int noclose)
#endif
#ifdef L_xsocket
-// Die with an error message if we can't open a new socket.
+/* Die with an error message if we can't open a new socket. */
int xsocket(int domain, int type, int protocol)
{
int r = socket(domain, type, protocol);
@@ -465,7 +472,7 @@ int xsocket(int domain, int type, int protocol)
#endif
#ifdef L_xbind
-// Die with an error message if we can't bind a socket to an address.
+/* Die with an error message if we can't bind a socket to an address. */
void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
{
if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
@@ -473,7 +480,7 @@ void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
#endif
#ifdef L_xlisten
-// Die with an error message if we can't listen for connections on a socket.
+/* Die with an error message if we can't listen for connections on a socket. */
void xlisten(int s, int backlog)
{
if (listen(s, backlog)) bb_perror_msg_and_die("listen");