mirror of
https://github.com/sheumann/hush.git
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Strangely, using // in the comments I added was not a persistent accident.
This commit is contained in:
Rob Landley
parent
7ccf5cc064
commit
da9d1d079e
127
libbb/xfuncs.c
127
libbb/xfuncs.c
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@ -21,7 +21,7 @@
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* included after these prototypes in libbb.h, all is well.
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*/
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#ifdef L_xmalloc
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/* Die if we can't allocate size bytes of memory. */
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// Die if we can't allocate size bytes of memory.
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void *xmalloc(size_t size)
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{
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void *ptr = malloc(size);
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@ -32,9 +32,9 @@ void *xmalloc(size_t size)
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#endif
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#ifdef L_xrealloc
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/* Die if we can't resize previously allocated memory. (This returns a pointer
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* to the new memory, which may or may not be the same as the old memory.
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* It'll copy the contents to a new chunk and free the old one if necessary.) */
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// Die if we can't resize previously allocated memory. (This returns a pointer
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// to the new memory, which may or may not be the same as the old memory.
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// It'll copy the contents to a new chunk and free the old one if necessary.)
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void *xrealloc(void *ptr, size_t size)
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{
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ptr = realloc(ptr, size);
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@ -47,7 +47,7 @@ void *xrealloc(void *ptr, size_t size)
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#ifdef L_xzalloc
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/* Die if we can't allocate and zero size bytes of memory. */
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// Die if we can't allocate and zero size bytes of memory.
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void *xzalloc(size_t size)
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{
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void *ptr = xmalloc(size);
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@ -57,7 +57,7 @@ void *xzalloc(size_t size)
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#endif
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#ifdef L_xstrdup
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/* Die if we can't copy a string to freshly allocated memory. */
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// Die if we can't copy a string to freshly allocated memory.
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char * xstrdup(const char *s)
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{
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char *t;
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@ -75,9 +75,8 @@ char * xstrdup(const char *s)
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#endif
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#ifdef L_xstrndup
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/* Die if we can't allocate n+1 bytes (space for the null terminator) and copy
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* the (possibly truncated to length n) string into it.
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*/
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// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
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// the (possibly truncated to length n) string into it.
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char * xstrndup(const char *s, int n)
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{
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char *t;
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@ -92,9 +91,8 @@ char * xstrndup(const char *s, int n)
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#endif
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#ifdef L_xfopen
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/* Die if we can't open a file and return a FILE * to it.
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* Notice we haven't got xfread(), This is for use with fscanf() and friends.
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*/
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// Die if we can't open a file and return a FILE * to it.
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// Notice we haven't got xfread(), This is for use with fscanf() and friends.
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FILE *xfopen(const char *path, const char *mode)
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{
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FILE *fp;
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@ -105,7 +103,7 @@ FILE *xfopen(const char *path, const char *mode)
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#endif
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#ifdef L_xopen
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/* Die if we can't open an existing file and return an fd. */
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// Die if we can't open an existing file and return an fd.
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int xopen(const char *pathname, int flags)
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{
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if (ENABLE_DEBUG && (flags & O_CREAT))
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@ -116,7 +114,7 @@ int xopen(const char *pathname, int flags)
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#endif
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#ifdef L_xopen3
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/* Die if we can't open a new file and return an fd. */
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// Die if we can't open a new file and return an fd.
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int xopen3(const char *pathname, int flags, int mode)
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{
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int ret;
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@ -130,7 +128,7 @@ int xopen3(const char *pathname, int flags, int mode)
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#endif
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#ifdef L_xread
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/* Die with an error message if we can't read the entire buffer. */
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// Die with an error message if we can't read the entire buffer.
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void xread(int fd, void *buf, size_t count)
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{
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while (count) {
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@ -145,7 +143,7 @@ void xread(int fd, void *buf, size_t count)
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#endif
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#ifdef L_xwrite
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/* Die with an error message if we can't write the entire buffer. */
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// Die with an error message if we can't write the entire buffer.
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void xwrite(int fd, void *buf, size_t count)
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{
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while (count) {
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@ -160,7 +158,7 @@ void xwrite(int fd, void *buf, size_t count)
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#endif
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#ifdef L_xlseek
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/* Die with an error message if we can't lseek to the right spot. */
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// Die with an error message if we can't lseek to the right spot.
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void xlseek(int fd, off_t offset, int whence)
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{
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if (offset != lseek(fd, offset, whence)) bb_error_msg_and_die("lseek");
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@ -168,7 +166,7 @@ void xlseek(int fd, off_t offset, int whence)
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#endif
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#ifdef L_xread_char
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/* Die with an error message if we can't read one character. */
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// Die with an error message if we can't read one character.
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unsigned char xread_char(int fd)
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{
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char tmp;
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@ -180,7 +178,7 @@ unsigned char xread_char(int fd)
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#endif
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#ifdef L_xferror
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/* Die with supplied error message if this FILE * has ferror set. */
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// Die with supplied error message if this FILE * has ferror set.
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void xferror(FILE *fp, const char *fn)
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{
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if (ferror(fp)) {
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@ -190,7 +188,7 @@ void xferror(FILE *fp, const char *fn)
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#endif
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#ifdef L_xferror_stdout
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/* Die with an error message if stdout has ferror set. */
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// Die with an error message if stdout has ferror set.
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void xferror_stdout(void)
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{
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xferror(stdout, bb_msg_standard_output);
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@ -198,7 +196,7 @@ void xferror_stdout(void)
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#endif
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#ifdef L_xfflush_stdout
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/* Die with an error message if we have trouble flushing stdout. */
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// Die with an error message if we have trouble flushing stdout.
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void xfflush_stdout(void)
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{
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if (fflush(stdout)) {
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@ -208,25 +206,24 @@ void xfflush_stdout(void)
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#endif
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#ifdef L_spawn
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/* This does a fork/exec in one call, using vfork(). Return PID of new child,
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* -1 for failure. Runs argv[0], searching path if that has no / in it.
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*/
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// This does a fork/exec in one call, using vfork(). Return PID of new child,
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// -1 for failure. Runs argv[0], searching path if that has no / in it.
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pid_t spawn(char **argv)
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{
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static int failed;
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pid_t pid;
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void *app = ENABLE_FEATURE_SH_STANDALONE_SHELL ? find_applet_by_name(argv[0]) : 0;
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/* Be nice to nommu machines. */
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// Be nice to nommu machines.
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failed = 0;
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pid = vfork();
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if (pid < 0) return pid;
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if (!pid) {
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execvp(app ? CONFIG_BUSYBOX_EXEC_PATH : *argv, argv);
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/* We're sharing a stack with blocked parent, let parent know we failed
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* and then exit to unblock parent (but don't run atexit() stuff, which
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would screw up parent.) */
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// We're sharing a stack with blocked parent, let parent know we failed
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// and then exit to unblock parent (but don't run atexit() stuff, which
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// would screw up parent.)
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failed = -1;
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_exit(0);
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@ -236,7 +233,7 @@ pid_t spawn(char **argv)
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#endif
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#ifdef L_xspawn
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/* Die with an error message if we can't spawn a child process. */
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// Die with an error message if we can't spawn a child process.
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pid_t xspawn(char **argv)
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{
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pid_t pid = spawn(argv);
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@ -246,7 +243,7 @@ pid_t xspawn(char **argv)
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#endif
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#ifdef L_wait4
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/* Wait for the specified child PID to exit, returning child's error return. */
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// Wait for the specified child PID to exit, returning child's error return.
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int wait4pid(int pid)
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{
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int status;
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@ -259,9 +256,9 @@ int wait4pid(int pid)
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#endif
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#ifdef L_itoa
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/* Convert unsigned integer to ascii, writing into supplied buffer. A
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* truncated result is always null terminated (unless buflen is 0), and
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* contains the first few digits of the result ala strncpy. */
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// Convert unsigned integer to ascii, writing into supplied buffer. A
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// truncated result is always null terminated (unless buflen is 0), and
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// contains the first few digits of the result ala strncpy.
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void utoa_to_buf(unsigned n, char *buf, unsigned buflen)
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{
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int i, out = 0;
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@ -279,7 +276,7 @@ void utoa_to_buf(unsigned n, char *buf, unsigned buflen)
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}
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}
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/* Convert signed integer to ascii, like utoa_to_buf() */
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// Convert signed integer to ascii, like utoa_to_buf()
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void itoa_to_buf(int n, char *buf, unsigned buflen)
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{
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if (buflen && n<0) {
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@ -290,16 +287,16 @@ void itoa_to_buf(int n, char *buf, unsigned buflen)
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utoa_to_buf((unsigned)n, buf, buflen);
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}
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/* The following two functions use a static buffer, so calling either one a
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* second time will overwrite previous results.
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*
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* The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
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* Int should always be 32 bits on any remotely Unix-like system, see
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* http://www.unix.org/whitepapers/64bit.html for the reasons why.
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*/
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// The following two functions use a static buffer, so calling either one a
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// second time will overwrite previous results.
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//
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// The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
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// Int should always be 32 bits on any remotely Unix-like system, see
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// http://www.unix.org/whitepapers/64bit.html for the reasons why.
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static char local_buf[12];
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/* Convert unsigned integer to ascii using a static buffer (returned). */
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// Convert unsigned integer to ascii using a static buffer (returned).
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char *utoa(unsigned n)
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{
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utoa_to_buf(n, local_buf, sizeof(local_buf));
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@ -307,7 +304,7 @@ char *utoa(unsigned n)
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return local_buf;
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}
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/* Convert signed integer to ascii using a static buffer (returned). */
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// Convert signed integer to ascii using a static buffer (returned).
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char *itoa(int n)
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{
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itoa_to_buf(n, local_buf, sizeof(local_buf));
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@ -317,15 +314,15 @@ char *itoa(int n)
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#endif
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#ifdef L_setuid
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/* Die with an error message if we can't set gid. (Because resource limits may
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* limit this user to a given number of processes, and if that fills up the
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* setgid() will fail and we'll _still_be_root_, which is bad.) */
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// Die with an error message if we can't set gid. (Because resource limits may
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// limit this user to a given number of processes, and if that fills up the
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// setgid() will fail and we'll _still_be_root_, which is bad.)
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void xsetgid(gid_t gid)
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{
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if (setgid(gid)) bb_error_msg_and_die("setgid");
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}
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/* Die with an error message if we cant' set uid. (See xsetgid() for why.) */
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// Die with an error message if we cant' set uid. (See xsetgid() for why.)
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void xsetuid(uid_t uid)
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{
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if (setuid(uid)) bb_error_msg_and_die("setuid");
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@ -333,31 +330,31 @@ void xsetuid(uid_t uid)
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#endif
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#ifdef L_fdlength
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/* Return how long the file at fd is, if there's any way to determine it. */
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// Return how long the file at fd is, if there's any way to determine it.
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off_t fdlength(int fd)
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{
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off_t bottom = 0, top = 0, pos;
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long size;
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/* If the ioctl works for this, return it. */
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// If the ioctl works for this, return it.
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if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
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/* If not, do a binary search for the last location we can read. (Some
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* block devices don't do BLKGETSIZE right.) */
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// If not, do a binary search for the last location we can read. (Some
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// block devices don't do BLKGETSIZE right.)
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do {
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char temp;
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pos = bottom + (top - bottom) / 2;
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/* If we can read from the current location, it's bigger. */
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// If we can read from the current location, it's bigger.
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if (lseek(fd, pos, 0)>=0 && safe_read(fd, &temp, 1)==1) {
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if (bottom == top) bottom = top = (top+1) * 2;
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else bottom = pos;
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/* If we can't, it's smaller. */
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// If we can't, it's smaller.
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} else {
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if (bottom == top) {
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@ -373,8 +370,8 @@ off_t fdlength(int fd)
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#endif
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#ifdef L_xasprintf
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/* Die with an error message if we can't malloc() enough space and do an
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* sprintf() into that space. */
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// Die with an error message if we can't malloc() enough space and do an
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// sprintf() into that space.
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char *xasprintf(const char *format, ...)
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{
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va_list p;
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@ -403,8 +400,8 @@ char *xasprintf(const char *format, ...)
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#endif
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#ifdef L_xprint_and_close_file
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/* Die with an error message if we can't copy an entire FILE * to stdout, then
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* close that file. */
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// Die with an error message if we can't copy an entire FILE * to stdout, then
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// close that file.
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void xprint_and_close_file(FILE *file)
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{
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// copyfd outputs error messages for us.
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@ -416,7 +413,7 @@ void xprint_and_close_file(FILE *file)
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#endif
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#ifdef L_xchdir
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/* Die if we can't chdir to a new path. */
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// Die if we can't chdir to a new path.
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void xchdir(const char *path)
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{
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if (chdir(path))
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@ -425,7 +422,7 @@ void xchdir(const char *path)
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#endif
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#ifdef L_warn_opendir
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/* Print a warning message if opendir() fails, but don't die. */
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// Print a warning message if opendir() fails, but don't die.
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DIR *warn_opendir(const char *path)
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{
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DIR *dp;
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@ -439,7 +436,7 @@ DIR *warn_opendir(const char *path)
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#endif
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#ifdef L_xopendir
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/* Die with an error message if opendir() fails. */
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// Die with an error message if opendir() fails.
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DIR *xopendir(const char *path)
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{
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DIR *dp;
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@ -452,7 +449,7 @@ DIR *xopendir(const char *path)
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#ifdef L_xdaemon
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#ifndef BB_NOMMU
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/* Die with an error message if we can't daemonize. */
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// Die with an error message if we can't daemonize.
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void xdaemon(int nochdir, int noclose)
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{
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if (daemon(nochdir, noclose)) bb_perror_msg_and_die("daemon");
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@ -461,7 +458,7 @@ void xdaemon(int nochdir, int noclose)
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#endif
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#ifdef L_xsocket
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/* Die with an error message if we can't open a new socket. */
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// Die with an error message if we can't open a new socket.
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int xsocket(int domain, int type, int protocol)
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{
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int r = socket(domain, type, protocol);
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@ -473,7 +470,7 @@ int xsocket(int domain, int type, int protocol)
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#endif
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#ifdef L_xbind
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/* Die with an error message if we can't bind a socket to an address. */
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// Die with an error message if we can't bind a socket to an address.
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void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
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{
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if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
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@ -481,7 +478,7 @@ void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
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#endif
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#ifdef L_xlisten
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/* Die with an error message if we can't listen for connections on a socket. */
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// Die with an error message if we can't listen for connections on a socket.
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void xlisten(int s, int backlog)
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{
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if (listen(s, backlog)) bb_perror_msg_and_die("listen");
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@ -489,7 +486,7 @@ void xlisten(int s, int backlog)
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#endif
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#ifdef L_xstat
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/* xstat() - a stat() which dies on failure with meaningful error message */
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// xstat() - a stat() which dies on failure with meaningful error message
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void xstat(char *name, struct stat *stat_buf)
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{
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if (stat(name, stat_buf))
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