diff options
Diffstat (limited to 'contrib/sendmail/libsm/stdio.c')
| -rw-r--r-- | contrib/sendmail/libsm/stdio.c | 497 |
1 files changed, 497 insertions, 0 deletions
diff --git a/contrib/sendmail/libsm/stdio.c b/contrib/sendmail/libsm/stdio.c new file mode 100644 index 0000000..e688fb9 --- /dev/null +++ b/contrib/sendmail/libsm/stdio.c @@ -0,0 +1,497 @@ +/* + * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. + * All rights reserved. + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * By using this file, you agree to the terms and conditions set + * forth in the LICENSE file which can be found at the top level of + * the sendmail distribution. + */ + +#include <sm/gen.h> +SM_RCSID("@(#)$Id: stdio.c,v 1.52 2001/09/18 21:45:23 gshapiro Exp $") +#include <unistd.h> +#include <errno.h> +#include <fcntl.h> +#include <string.h> /* FreeBSD: FD_ZERO needs <string.h> */ +#include <sys/stat.h> +#include <sys/time.h> +#include <sm/heap.h> +#include <sm/assert.h> +#include <sm/varargs.h> +#include <sm/io.h> +#include <sm/fdset.h> +#include <sm/setjmp.h> +#include <sm/conf.h> +#include "local.h" + +/* +** Overall: +** Small standard I/O/seek/close functions. +** These maintain the `known seek offset' for seek optimization. +*/ + +/* +** SM_STDOPEN -- open a file with stdio behavior +** +** Not associated with the system's stdio in libc. +** +** Parameters: +** fp -- file pointer to be associated with the open +** info -- pathname of the file to be opened +** flags -- indicates type of access methods +** rpool -- ignored +** +** Returns: +** Failure: -1 and set errno +** Success: 0 or greater (fd of file from open(2)). +** +*/ + +/* ARGSUSED3 */ +int +sm_stdopen(fp, info, flags, rpool) + SM_FILE_T *fp; + const void *info; + int flags; + const void *rpool; +{ + char *path = (char *) info; + int oflags; + + switch (flags) + { + case SM_IO_RDWR: + oflags = O_RDWR; + break; + case SM_IO_RDWRTR: + oflags = O_RDWR | O_CREAT | O_TRUNC; + break; + case SM_IO_RDONLY: + oflags = O_RDONLY; + break; + case SM_IO_WRONLY: + oflags = O_WRONLY | O_CREAT | O_TRUNC; + break; + case SM_IO_APPEND: + oflags = O_APPEND | O_WRONLY | O_CREAT; + break; + case SM_IO_APPENDRW: + oflags = O_APPEND | O_RDWR | O_CREAT; + break; + default: + errno = EINVAL; + return -1; + } + fp->f_file = open(path, oflags, + S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); + if (fp->f_file < 0) + return -1; /* errno set by open() */ + + if (oflags & O_APPEND) + (void) (*fp->f_seek)((void *)fp, (off_t)0, SEEK_END); + + return fp->f_file; +} + +/* +** SM_STDREAD -- read from the file +** +** Parameters: +** fp -- file pointer to read from +** buf -- location to place read data +** n -- number of bytes to read +** +** Returns: +** Failure: -1 and sets errno +** Success: number of bytes read +** +** Side Effects: +** Updates internal offset into file. +*/ + +ssize_t +sm_stdread(fp, buf, n) + SM_FILE_T *fp; + char *buf; + size_t n; +{ + register int ret; + + ret = read(fp->f_file, buf, n); + + /* if the read succeeded, update the current offset */ + if (ret > 0) + fp->f_lseekoff += ret; + return ret; +} + +/* +** SM_STDWRITE -- write to the file +** +** Parameters: +** fp -- file pointer ro write to +** buf -- location of data to be written +** n - number of bytes to write +** +** Returns: +** Failure: -1 and sets errno +** Success: number of bytes written +*/ + +ssize_t +sm_stdwrite(fp, buf, n) + SM_FILE_T *fp; + char const *buf; + size_t n; +{ + return write(fp->f_file, buf, n); +} + +/* +** SM_STDSEEK -- set the file offset position +** +** Parmeters: +** fp -- file pointer to position +** offset -- how far to position from "base" (set by 'whence') +** whence -- indicates where the "base" of the 'offset' to start +** +** Results: +** Failure: -1 and sets errno +** Success: the current offset +** +** Side Effects: +** Updates the internal value of the offset. +*/ + +off_t +sm_stdseek(fp, offset, whence) + SM_FILE_T *fp; + off_t offset; + int whence; +{ + register off_t ret; + + ret = lseek(fp->f_file, (off_t) offset, whence); + if (ret != (off_t) -1) + fp->f_lseekoff = ret; + return ret; +} + +/* +** SM_STDCLOSE -- close the file +** +** Parameters: +** fp -- the file pointer to close +** +** Returns: +** Success: 0 (zero) +** Failure: -1 and sets errno +*/ + +int +sm_stdclose(fp) + SM_FILE_T *fp; +{ + return close(fp->f_file); +} + +/* +** SM_STDSETMODE -- set the access mode for the file +** +** Called by sm_stdsetinfo(). +** +** Parameters: +** fp -- file pointer +** mode -- new mode to set the file access to +** +** Results: +** Success: 0 (zero); +** Failure: -1 and sets errno +*/ + +int +sm_stdsetmode(fp, mode) + SM_FILE_T *fp; + const int *mode; +{ + int flags = 0; + + switch (*mode) + { + case SM_IO_RDWR: + flags |= SMRW; + break; + case SM_IO_RDONLY: + flags |= SMRD; + break; + case SM_IO_WRONLY: + flags |= SMWR; + break; + case SM_IO_APPEND: + default: + errno = EINVAL; + return -1; + } + fp->f_flags = fp->f_flags & ~SMMODEMASK; + fp->f_flags |= flags; + return 0; +} + +/* +** SM_STDGETMODE -- for getinfo determine open mode +** +** Called by sm_stdgetinfo(). +** +** Parameters: +** fp -- the file mode being determined +** mode -- internal mode to map to external value +** +** Results: +** Failure: -1 and sets errno +** Success: external mode value +*/ + +int +sm_stdgetmode(fp, mode) + SM_FILE_T *fp; + int *mode; +{ + switch (fp->f_flags & SMMODEMASK) + { + case SMRW: + *mode = SM_IO_RDWR; + break; + case SMRD: + *mode = SM_IO_RDONLY; + break; + case SMWR: + *mode = SM_IO_WRONLY; + break; + default: + errno = EINVAL; + return -1; + } + return 0; +} + +/* +** SM_STDSETINFO -- set/modify information for a file +** +** Parameters: +** fp -- file to set info for +** what -- type of info to set +** valp -- location of data used for setting +** +** Returns: +** Failure: -1 and sets errno +** Success: >=0 +*/ + +int +sm_stdsetinfo(fp, what, valp) + SM_FILE_T *fp; + int what; + void *valp; +{ + switch (what) + { + case SM_IO_WHAT_MODE: + return sm_stdsetmode(fp, (const int *)valp); + + default: + errno = EINVAL; + return -1; + } +} + +/* +** SM_GETINFO -- get information about the open file +** +** Parameters: +** fp -- file to get info for +** what -- type of info to get +** valp -- location to place found info +** +** Returns: +** Success: may or may not place info in 'valp' depending +** on 'what' value, and returns values >=0. Return +** value may be the obtained info +** Failure: -1 and sets errno +*/ + +int +sm_stdgetinfo(fp, what, valp) + SM_FILE_T *fp; + int what; + void *valp; +{ + switch (what) + { + case SM_IO_WHAT_MODE: + return sm_stdgetmode(fp, (int *)valp); + + case SM_IO_WHAT_FD: + return fp->f_file; + + case SM_IO_IS_READABLE: + { + fd_set readfds; + struct timeval timeout; + + FD_ZERO(&readfds); + SM_FD_SET(fp->f_file, &readfds); + timeout.tv_sec = 0; + timeout.tv_usec = 0; + if (select(fp->f_file + 1, + FDSET_CAST &readfds, + NULL, + NULL, + &timeout) > 0 && + SM_FD_ISSET(fp->f_file, &readfds)) + return 1; + return 0; + } + + default: + errno = EINVAL; + return -1; + } +} + +/* +** SM_STDFDOPEN -- open file by primative 'fd' rather than pathname +** +** I/O function to handle fdopen() stdio equivalence. The rest of +** the functions are the same as the sm_stdopen() above. +** +** Parameters: +** fp -- the file pointer to be associated with the open +** name -- the primative file descriptor for association +** flags -- indicates type of access methods +** rpool -- ignored +** +** Results: +** Success: primative file descriptor value +** Failure: -1 and sets errno +*/ + +/* ARGSUSED3 */ +int +sm_stdfdopen(fp, info, flags, rpool) + SM_FILE_T *fp; + const void *info; + int flags; + const void *rpool; +{ + int oflags, tmp, fdflags, fd = *((int *) info); + + switch (flags) + { + case SM_IO_RDWR: + oflags = O_RDWR | O_CREAT; + break; + case SM_IO_RDONLY: + oflags = O_RDONLY; + break; + case SM_IO_WRONLY: + oflags = O_WRONLY | O_CREAT | O_TRUNC; + break; + case SM_IO_APPEND: + oflags = O_APPEND | O_WRONLY | O_CREAT; + break; + case SM_IO_APPENDRW: + oflags = O_APPEND | O_RDWR | O_CREAT; + break; + default: + errno = EINVAL; + return -1; + } + + /* Make sure the mode the user wants is a subset of the actual mode. */ + if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0) + return -1; + + tmp = fdflags & O_ACCMODE; + if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) + { + errno = EINVAL; + return -1; + } + fp->f_file = fd; + if (oflags & O_APPEND) + (void) (*fp->f_seek)(fp, (off_t)0, SEEK_END); + return fp->f_file; +} + +/* +** SM_IO_FOPEN -- open a file +** +** Same interface and semantics as the open() system call, +** except that it returns SM_FILE_T* instead of a file descriptor. +** +** Parameters: +** pathname -- path of file to open +** flags -- flags controlling the open +** ... -- option "mode" for opening the file +** +** Returns: +** Raises an exception on heap exhaustion. +** Returns NULL and sets errno if open() fails. +** Returns an SM_FILE_T pointer on success. +*/ + +SM_FILE_T * +#if SM_VA_STD +sm_io_fopen(char *pathname, int flags, ...) +#else /* SM_VA_STD */ +sm_io_fopen(pathname, flags, va_alist) + char *pathname; + int flags; + va_dcl +#endif /* SM_VA_STD */ +{ + MODE_T mode; + SM_FILE_T *fp; + int ioflags; + + if (flags & O_CREAT) + { + SM_VA_LOCAL_DECL + + SM_VA_START(ap, flags); + mode = (MODE_T) SM_VA_ARG(ap, int); + SM_VA_END(ap); + } + else + mode = 0; + + switch (flags & O_ACCMODE) + { + case O_RDONLY: + ioflags = SMRD; + break; + case O_WRONLY: + ioflags = SMWR; + break; + case O_RDWR: + ioflags = SMRW; + break; + default: + sm_abort("sm_io_fopen: bad flags 0%o", flags); + } + + fp = sm_fp(SmFtStdio, ioflags, NULL); + fp->f_file = open(pathname, flags, mode); + if (fp->f_file == -1) + { + fp->f_flags = 0; + fp->sm_magic = NULL; + return NULL; + } + return fp; +} |
