X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=libbb%2Fxfuncs.c;h=8ef305ba08e2b1d4301ae92941bb29b23f2f6807;hb=96c45b0e0bda5bf47c03682c8fcbeae7ade89386;hp=352515af40da8c8b5374d7d5bc0a5d1c3935064f;hpb=aae0311356b4458e3a62fb19af656e00323e3bf1;p=oweals%2Fbusybox.git diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c index 352515af4..8ef305ba0 100644 --- a/libbb/xfuncs.c +++ b/libbb/xfuncs.c @@ -4,252 +4,152 @@ * * Copyright (C) 1999-2004 by Erik Andersen * Copyright (C) 2006 Rob Landley - * Copyright (C) 2006 Denis Vlasenko + * Copyright (C) 2006 Denys Vlasenko * * Licensed under GPL version 2, see file LICENSE in this tarball for details. */ -#include "busybox.h" - -/* All the functions starting with "x" call bb_error_msg_and_die() if they - * fail, so callers never need to check for errors. If it returned, it - * 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. +/* We need to have separate xfuncs.c and xfuncs_printf.c because + * with current linkers, even with section garbage collection, + * if *.o module references any of XXXprintf functions, you pull in + * entire printf machinery. Even if you do not use the function + * which uses XXXprintf. + * + * xfuncs.c contains functions (not necessarily xfuncs) + * which do not pull in printf, directly or indirectly. + * xfunc_printf.c contains those which do. + * + * TODO: move xmalloc() and xatonum() here. */ -// Die if we can't allocate size bytes of memory. -void *xmalloc(size_t size) -{ - void *ptr = malloc(size); - if (ptr == NULL && size != 0) - bb_error_msg_and_die(bb_msg_memory_exhausted); - return ptr; -} - -// 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); - if (ptr == NULL && size != 0) - bb_error_msg_and_die(bb_msg_memory_exhausted); - return ptr; -} -#endif /* DMALLOC */ - -// Die if we can't allocate and zero size bytes of memory. -void *xzalloc(size_t size) -{ - void *ptr = xmalloc(size); - memset(ptr, 0, size); - return ptr; -} - -// Die if we can't copy a string to freshly allocated memory. -char * xstrdup(const char *s) -{ - char *t; - if (s == NULL) - return NULL; +#include "libbb.h" - t = strdup (s); - - if (t == NULL) - bb_error_msg_and_die(bb_msg_memory_exhausted); - - return t; -} - -// 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; - - if (ENABLE_DEBUG && s == NULL) - bb_error_msg_and_die("xstrndup bug"); - - t = xmalloc(++n); - - return safe_strncpy(t,s,n); -} - -// 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) +/* Turn on nonblocking I/O on a fd */ +int FAST_FUNC ndelay_on(int fd) { - FILE *fp; - if ((fp = fopen(path, mode)) == NULL) - bb_perror_msg_and_die("%s", path); - return fp; + return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) | O_NONBLOCK); } -// Die if we can't open an existing file and return an fd. -int xopen(const char *pathname, int flags) +int FAST_FUNC ndelay_off(int fd) { - if (ENABLE_DEBUG && (flags & O_CREAT)) - bb_error_msg_and_die("xopen() with O_CREAT"); - - return xopen3(pathname, flags, 0666); + return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) & ~O_NONBLOCK); } -// Die if we can't open a new file and return an fd. -int xopen3(const char *pathname, int flags, int mode) +int FAST_FUNC close_on_exec_on(int fd) { - int ret; - - ret = open(pathname, flags, mode); - if (ret < 0) { - bb_perror_msg_and_die("%s", pathname); - } - return ret; + return fcntl(fd, F_SETFD, FD_CLOEXEC); } -// Die with an error message if we can't write the entire buffer. -void xwrite(int fd, void *buf, size_t count) +/* Convert unsigned long long value into compact 4-char + * representation. Examples: "1234", "1.2k", " 27M", "123T" + * String is not terminated (buf[4] is untouched) */ +void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale) { - if (count) { - ssize_t size = full_write(fd, buf, count); - if (size != count) - bb_error_msg_and_die("short write"); - } -} - -// Die with an error message if we can't lseek to the right spot. -off_t xlseek(int fd, off_t offset, int whence) -{ - off_t off = lseek(fd, offset, whence); - if (off == (off_t)-1) - bb_perror_msg_and_die("lseek"); - return off; -} - -// Die with supplied error message if this FILE * has ferror set. -void die_if_ferror(FILE *fp, const char *fn) -{ - if (ferror(fp)) { - bb_error_msg_and_die("%s", fn); - } -} - -// Die with an error message if stdout has ferror set. -void die_if_ferror_stdout(void) -{ - die_if_ferror(stdout, bb_msg_standard_output); -} + const char *fmt; + char c; + unsigned v, u, idx = 0; -// Die with an error message if we have trouble flushing stdout. -void xfflush_stdout(void) -{ - if (fflush(stdout)) { - bb_perror_msg_and_die(bb_msg_standard_output); + if (ul > 9999) { // do not scale if 9999 or less + ul *= 10; + do { + ul /= 1024; + idx++; + } while (ul >= 10000); } -} + v = ul; // ullong divisions are expensive, avoid them -// 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. - 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.) - - failed = -1; - _exit(0); + fmt = " 123456789"; + u = v / 10; + v = v % 10; + if (!idx) { + // 9999 or less: use "1234" format + // u is value/10, v is last digit + c = buf[0] = " 123456789"[u/100]; + if (c != ' ') fmt = "0123456789"; + c = buf[1] = fmt[u/10%10]; + if (c != ' ') fmt = "0123456789"; + buf[2] = fmt[u%10]; + buf[3] = "0123456789"[v]; + } else { + // u is value, v is 1/10ths (allows for 9.2M format) + if (u >= 10) { + // value is >= 10: use "123M', " 12M" formats + c = buf[0] = " 123456789"[u/100]; + if (c != ' ') fmt = "0123456789"; + v = u % 10; + u = u / 10; + buf[1] = fmt[u%10]; + } else { + // value is < 10: use "9.2M" format + buf[0] = "0123456789"[u]; + buf[1] = '.'; + } + buf[2] = "0123456789"[v]; + buf[3] = scale[idx]; /* typically scale = " kmgt..." */ } - return failed ? failed : pid; -} - -// Die with an error message if we can't spawn a child process. -pid_t xspawn(char **argv) -{ - pid_t pid = spawn(argv); - if (pid < 0) bb_perror_msg_and_die("%s", *argv); - return pid; } -// Wait for the specified child PID to exit, returning child's error return. -int wait4pid(int pid) +/* Convert unsigned long long value into compact 5-char representation. + * String is not terminated (buf[5] is untouched) */ +void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale) { - int status; - - if (pid == -1 || waitpid(pid, &status, 0) == -1) return -1; - if (WIFEXITED(status)) return WEXITSTATUS(status); - if (WIFSIGNALED(status)) return WTERMSIG(status); - return 0; -} - -void xsetenv(const char *key, const char *value) -{ - if (setenv(key, value, 1)) - bb_error_msg_and_die(bb_msg_memory_exhausted); -} - - -// Converts unsigned long long value into compact 4-char -// representation. Examples: "1234", "1.2k", " 27M", "123T" -// Fifth char is always '\0' -void smart_ulltoa5(unsigned long long ul, char buf[5]) -{ - char *fmt; + const char *fmt; char c; - unsigned v,idx = 0; - ul *= 10; - if (ul > 9999*10) { // do not scale if 9999 or less - while (ul >= 10000) { + unsigned v, u, idx = 0; + + if (ul > 99999) { // do not scale if 99999 or less + ul *= 10; + do { ul /= 1024; idx++; - } + } while (ul >= 100000); } v = ul; // ullong divisions are expensive, avoid them fmt = " 123456789"; - if (!idx) { // 9999 or less: use 1234 format - c = buf[0] = " 123456789"[v/10000]; - if (c!=' ') fmt = "0123456789"; - c = buf[1] = fmt[v/1000%10]; - if (c!=' ') fmt = "0123456789"; - buf[2] = fmt[v/100%10]; - buf[3] = "0123456789"[v/10%10]; + u = v / 10; + v = v % 10; + if (!idx) { + // 99999 or less: use "12345" format + // u is value/10, v is last digit + c = buf[0] = " 123456789"[u/1000]; + if (c != ' ') fmt = "0123456789"; + c = buf[1] = fmt[u/100%10]; + if (c != ' ') fmt = "0123456789"; + c = buf[2] = fmt[u/10%10]; + if (c != ' ') fmt = "0123456789"; + buf[3] = fmt[u%10]; + buf[4] = "0123456789"[v]; } else { - if (v>=10*10) { // scaled value is >=10: use 123M format - c = buf[0] = " 123456789"[v/1000]; - if (c!=' ') fmt = "0123456789"; - buf[1] = fmt[v/100%10]; - buf[2] = "0123456789"[v/10%10]; - } else { // scaled value is <10: use 1.2M format - buf[0] = "0123456789"[v/10]; - buf[1] = '.'; - buf[2] = "0123456789"[v%10]; + // value has been scaled into 0..9999.9 range + // u is value, v is 1/10ths (allows for 92.1M format) + if (u >= 100) { + // value is >= 100: use "1234M', " 123M" formats + c = buf[0] = " 123456789"[u/1000]; + if (c != ' ') fmt = "0123456789"; + c = buf[1] = fmt[u/100%10]; + if (c != ' ') fmt = "0123456789"; + v = u % 10; + u = u / 10; + buf[2] = fmt[u%10]; + } else { + // value is < 100: use "92.1M" format + c = buf[0] = " 123456789"[u/10]; + if (c != ' ') fmt = "0123456789"; + buf[1] = fmt[u%10]; + buf[2] = '.'; } - // see http://en.wikipedia.org/wiki/Tera - buf[3] = " kMGTPEZY"[idx]; + buf[3] = "0123456789"[v]; + buf[4] = scale[idx]; /* typically scale = " kmgt..." */ } - buf[4] = '\0'; } -// 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 contains the first few digits of the result ala strncpy. +// Returns a pointer past last generated digit, does _not_ store NUL. void BUG_sizeof_unsigned_not_4(void); -void utoa_to_buf(unsigned n, char *buf, unsigned buflen) +char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen) { unsigned i, out, res; if (sizeof(unsigned) != 4) @@ -265,62 +165,62 @@ void utoa_to_buf(unsigned n, char *buf, unsigned buflen) *buf++ = '0' + res; } } - *buf = '\0'; } + return buf; } -// Convert signed integer to ascii, like utoa_to_buf() -void itoa_to_buf(int n, char *buf, unsigned buflen) +/* Convert signed integer to ascii, like utoa_to_buf() */ +char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen) { - if (buflen && n<0) { + if (buflen && n < 0) { n = -n; *buf++ = '-'; buflen--; } - utoa_to_buf((unsigned)n, buf, buflen); + return 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. +// It so happens that sizeof(int) * 3 is enough for 32+ bits. +// (sizeof(int) * 3 + 2 is correct for any width, even 8-bit) -static char local_buf[12]; +static char local_buf[sizeof(int) * 3]; // Convert unsigned integer to ascii using a static buffer (returned). -char *utoa(unsigned n) +char* FAST_FUNC utoa(unsigned n) { - utoa_to_buf(n, local_buf, sizeof(local_buf)); + *(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0'; return local_buf; } -// Convert signed integer to ascii using a static buffer (returned). -char *itoa(int n) +/* Convert signed integer to ascii using a static buffer (returned). */ +char* FAST_FUNC itoa(int n) { - itoa_to_buf(n, local_buf, sizeof(local_buf)); + *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0'; return local_buf; } -// 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) +/* Emit a string of hex representation of bytes */ +char* FAST_FUNC bin2hex(char *p, const char *cp, int count) { - if (setgid(gid)) bb_error_msg_and_die("setgid"); -} - -// Die with an error message if we can't set uid. (See xsetgid() for why.) -void xsetuid(uid_t uid) -{ - if (setuid(uid)) bb_error_msg_and_die("setuid"); + while (count) { + unsigned char c = *cp++; + /* put lowercase hex digits */ + *p++ = 0x20 | bb_hexdigits_upcase[c >> 4]; + *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf]; + count--; + } + return p; } -// Return how long the file at fd is, if there's any way to determine it. -off_t fdlength(int fd) +/* Return how long the file at fd is, if there's any way to determine it. */ +#ifdef UNUSED +off_t FAST_FUNC fdlength(int fd) { off_t bottom = 0, top = 0, pos; long size; @@ -358,117 +258,11 @@ off_t fdlength(int fd) return pos + 1; } - -// 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; - int r; - char *string_ptr; - -#if 1 - // GNU extension - va_start(p, format); - r = vasprintf(&string_ptr, format, p); - va_end(p); -#else - // Bloat for systems that haven't got the GNU extension. - va_start(p, format); - r = vsnprintf(NULL, 0, format, p); - va_end(p); - string_ptr = xmalloc(r+1); - va_start(p, format); - r = vsnprintf(string_ptr, r+1, format, p); - va_end(p); -#endif - - if (r < 0) bb_error_msg_and_die(bb_msg_memory_exhausted); - return string_ptr; -} - -// 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) -{ - fflush(stdout); - // copyfd outputs error messages for us. - if (bb_copyfd_eof(fileno(file), 1) == -1) - exit(xfunc_error_retval); - - fclose(file); -} - -// Die if we can't chdir to a new path. -void xchdir(const char *path) -{ - if (chdir(path)) - bb_perror_msg_and_die("chdir(%s)", path); -} - -// Print a warning message if opendir() fails, but don't die. -DIR *warn_opendir(const char *path) -{ - DIR *dp; - - if ((dp = opendir(path)) == NULL) { - bb_perror_msg("unable to open `%s'", path); - return NULL; - } - return dp; -} - -// Die with an error message if opendir() fails. -DIR *xopendir(const char *path) -{ - DIR *dp; - - if ((dp = opendir(path)) == NULL) - bb_perror_msg_and_die("unable to open `%s'", path); - return dp; -} - -#ifndef BB_NOMMU -// 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"); -} #endif -// 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); - - if (r < 0) bb_perror_msg_and_die("socket"); - - return r; -} - -// 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"); -} - -// 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"); -} - -// xstat() - a stat() which dies on failure with meaningful error message -void xstat(char *name, struct stat *stat_buf) -{ - if (stat(name, stat_buf)) - bb_perror_msg_and_die("can't stat '%s'", name); -} - /* It is perfectly ok to pass in a NULL for either width or for * height, in which case that value will not be set. */ -int get_terminal_width_height(int fd, int *width, int *height) +int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height) { struct winsize win = { 0, 0, 0, 0 }; int ret = ioctl(fd, TIOCGWINSZ, &win);