diff options
Diffstat (limited to 'libbb/xfuncs.c')
| -rw-r--r-- | libbb/xfuncs.c | 127 |
1 files changed, 62 insertions, 65 deletions
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c index 0f0faaf74..3baf7b251 100644 --- a/libbb/xfuncs.c +++ b/libbb/xfuncs.c @@ -21,7 +21,7 @@ * 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); @@ -32,9 +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); @@ -47,7 +47,7 @@ void *xrealloc(void *ptr, size_t size) #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); @@ -57,7 +57,7 @@ void *xzalloc(size_t size) #endif #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; @@ -75,9 +75,8 @@ 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; @@ -92,9 +91,8 @@ 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; @@ -105,7 +103,7 @@ 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)) @@ -116,7 +114,7 @@ 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; @@ -130,7 +128,7 @@ 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) { @@ -145,7 +143,7 @@ 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) { @@ -160,7 +158,7 @@ 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"); @@ -168,7 +166,7 @@ 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; @@ -180,7 +178,7 @@ 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)) { @@ -190,7 +188,7 @@ 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); @@ -198,7 +196,7 @@ 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)) { @@ -208,25 +206,24 @@ 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); @@ -236,7 +233,7 @@ 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); @@ -246,7 +243,7 @@ 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; @@ -259,9 +256,9 @@ 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; @@ -279,7 +276,7 @@ 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) { @@ -290,16 +287,16 @@ 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)); @@ -307,7 +304,7 @@ 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)); @@ -317,15 +314,15 @@ 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"); @@ -333,31 +330,31 @@ 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) { @@ -373,8 +370,8 @@ 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; @@ -403,8 +400,8 @@ 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. @@ -416,7 +413,7 @@ 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)) @@ -425,7 +422,7 @@ 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; @@ -439,7 +436,7 @@ 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; @@ -452,7 +449,7 @@ 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"); @@ -461,7 +458,7 @@ 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); @@ -473,7 +470,7 @@ 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"); @@ -481,7 +478,7 @@ 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"); @@ -489,7 +486,7 @@ void xlisten(int s, int backlog) #endif #ifdef L_xstat -/* xstat() - a stat() which dies on failure with meaningful error message */ +// xstat() - a stat() which dies on failure with meaningful error message void xstat(char *name, struct stat *stat_buf) { if (stat(name, stat_buf)) |