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Diffstat (limited to 'archival/tar.c')
| -rw-r--r-- | archival/tar.c | 1425 |
1 files changed, 1425 insertions, 0 deletions
diff --git a/archival/tar.c b/archival/tar.c new file mode 100644 index 0000000..03da967 --- /dev/null +++ b/archival/tar.c @@ -0,0 +1,1425 @@ +/* + * Copyright (c) 1999 by David I. Bell + * Permission is granted to use, distribute, or modify this source, + * provided that this copyright notice remains intact. + * + * The "tar" command, taken from sash. + * This allows creation, extraction, and listing of tar files. + * + * Permission to distribute this code under the GPL has been granted. + * Modified for busybox by Erik Andersen <andersee@debian.org> <andersen@lineo.com> + */ + + +#include "internal.h" + +#ifdef BB_TAR + +const char tar_usage[] = +"Create, extract, or list files from a TAR file\n\n" +"usage: tar -[cxtvOf] [tarFileName] [FILE] ...\n" +"\tc=create, x=extract, t=list contents, v=verbose,\n" +"\tO=extract to stdout, f=tarfile or \"-\" for stdin\n"; + + + +#include <stdio.h> +#include <dirent.h> +#include <errno.h> +#include <fcntl.h> +#include <signal.h> +#include <time.h> + +/* + * Tar file constants. + */ +#define TAR_BLOCK_SIZE 512 +#define TAR_NAME_SIZE 100 + + +/* + * The POSIX (and basic GNU) tar header format. + * This structure is always embedded in a TAR_BLOCK_SIZE sized block + * with zero padding. We only process this information minimally. + */ +typedef struct +{ + char name[TAR_NAME_SIZE]; + char mode[8]; + char uid[8]; + char gid[8]; + char size[12]; + char mtime[12]; + char checkSum[8]; + char typeFlag; + char linkName[TAR_NAME_SIZE]; + char magic[6]; + char version[2]; + char uname[32]; + char gname[32]; + char devMajor[8]; + char devMinor[8]; + char prefix[155]; +} TarHeader; + +#define TAR_MAGIC "ustar" +#define TAR_VERSION "00" + +#define TAR_TYPE_REGULAR '0' +#define TAR_TYPE_HARD_LINK '1' +#define TAR_TYPE_SOFT_LINK '2' + + +/* + * Static data. + */ +static BOOL listFlag; +static BOOL extractFlag; +static BOOL createFlag; +static BOOL verboseFlag; +static BOOL tostdoutFlag; + +static BOOL inHeader; +static BOOL badHeader; +static BOOL errorFlag; +static BOOL skipFileFlag; +static BOOL warnedRoot; +static BOOL eofFlag; +static long dataCc; +static int outFd; +static char outName[TAR_NAME_SIZE]; + + +/* + * Static data associated with the tar file. + */ +static const char * tarName; +static int tarFd; +static dev_t tarDev; +static ino_t tarInode; + + +/* + * Local procedures to restore files from a tar file. + */ +static void readTarFile(int fileCount, char ** fileTable); +static void readData(const char * cp, int count); +static void createPath(const char * name, int mode); +static long getOctal(const char * cp, int len); + +static void readHeader(const TarHeader * hp, + int fileCount, char ** fileTable); + + +/* + * Local procedures to save files into a tar file. + */ +static void saveFile(const char * fileName, BOOL seeLinks); + +static void saveRegularFile(const char * fileName, + const struct stat * statbuf); + +static void saveDirectory(const char * fileName, + const struct stat * statbuf); + +static BOOL wantFileName(const char * fileName, + int fileCount, char ** fileTable); + +static void writeHeader(const char * fileName, + const struct stat * statbuf); + +static void writeTarFile(int fileCount, char ** fileTable); +static void writeTarBlock(const char * buf, int len); +static BOOL putOctal(char * cp, int len, long value); +extern const char * modeString(int mode); +extern const char * timeString(time_t timeVal); +extern int fullWrite(int fd, const char * buf, int len); +extern int fullRead(int fd, char * buf, int len); + + +extern int +tar_main(struct FileInfo *unused, int argc, char ** argv) +{ + const char * options; + + argc--; + argv++; + + if (argc < 1) + { + fprintf(stderr, "%s", tar_usage); + return 1; + } + + + errorFlag = FALSE; + extractFlag = FALSE; + createFlag = FALSE; + listFlag = FALSE; + verboseFlag = FALSE; + tostdoutFlag = FALSE; + tarName = NULL; + tarDev = 0; + tarInode = 0; + tarFd = -1; + + /* + * Parse the options. + */ + options = *argv++; + argc--; + + if (**argv == '-') { + for (; *options; options++) + { + switch (*options) + { + case 'f': + if (tarName != NULL) + { + fprintf(stderr, "Only one 'f' option allowed\n"); + + return 1; + } + + tarName = *argv++; + argc--; + + break; + + case 't': + listFlag = TRUE; + break; + + case 'x': + extractFlag = TRUE; + break; + + case 'c': + createFlag = TRUE; + break; + + case 'v': + verboseFlag = TRUE; + break; + + case 'O': + tostdoutFlag = TRUE; + break; + + case '-': + break; + + default: + fprintf(stderr, "Unknown tar flag '%c'\n", *options); + + return 1; + } + } + } + + /* + * Validate the options. + */ + if (extractFlag + listFlag + createFlag != 1) + { + fprintf(stderr, "Exactly one of 'c', 'x' or 't' must be specified\n"); + + return 1; + } + + /* + * Do the correct type of action supplying the rest of the + * command line arguments as the list of files to process. + */ + if (createFlag) + writeTarFile(argc, argv); + else + readTarFile(argc, argv); + if (errorFlag) + fprintf(stderr, "\n"); + return( errorFlag); +} + + +/* + * Read a tar file and extract or list the specified files within it. + * If the list is empty than all files are extracted or listed. + */ +static void +readTarFile(int fileCount, char ** fileTable) +{ + const char * cp; + int cc; + int inCc; + int blockSize; + char buf[BUF_SIZE]; + + skipFileFlag = FALSE; + badHeader = FALSE; + warnedRoot = FALSE; + eofFlag = FALSE; + inHeader = TRUE; + inCc = 0; + dataCc = 0; + outFd = -1; + blockSize = sizeof(buf); + cp = buf; + + /* + * Open the tar file for reading. + */ + if ( (tarName==NULL) || !strcmp( tarName, "-") ) { + tarFd = STDIN; + } + else + tarFd = open(tarName, O_RDONLY); + + if (tarFd < 0) + { + perror(tarName); + errorFlag = TRUE; + return; + } + + /* + * Read blocks from the file until an end of file header block + * has been seen. (A real end of file from a read is an error.) + */ + while (!eofFlag) + { + /* + * Read the next block of data if necessary. + * This will be a large block if possible, which we will + * then process in the small tar blocks. + */ + if (inCc <= 0) + { + cp = buf; + inCc = fullRead(tarFd, buf, blockSize); + + if (inCc < 0) + { + perror(tarName); + errorFlag=TRUE; + goto done; + } + + if (inCc == 0) + { + fprintf(stderr, + "Unexpected end of file from \"%s\"", + tarName); + errorFlag=TRUE; + goto done; + } + } + + /* + * If we are expecting a header block then examine it. + */ + if (inHeader) + { + readHeader((const TarHeader *) cp, fileCount, fileTable); + + cp += TAR_BLOCK_SIZE; + inCc -= TAR_BLOCK_SIZE; + + continue; + } + + /* + * We are currently handling the data for a file. + * Process the minimum of the amount of data we have available + * and the amount left to be processed for the file. + */ + cc = inCc; + + if (cc > dataCc) + cc = dataCc; + + readData(cp, cc); + + /* + * If the amount left isn't an exact multiple of the tar block + * size then round it up to the next block boundary since there + * is padding at the end of the file. + */ + if (cc % TAR_BLOCK_SIZE) + cc += TAR_BLOCK_SIZE - (cc % TAR_BLOCK_SIZE); + + cp += cc; + inCc -= cc; + } + +done: + /* + * Close the tar file if needed. + */ + if ((tarFd >= 0) && (close(tarFd) < 0)) + perror(tarName); + + /* + * Close the output file if needed. + * This is only done here on a previous error and so no + * message is required on errors. + */ + if (tostdoutFlag==FALSE) { + if (outFd >= 0) + (void) close(outFd); + } +} + + +/* + * Examine the header block that was just read. + * This can specify the information for another file, or it can mark + * the end of the tar file. + */ +static void +readHeader(const TarHeader * hp, int fileCount, char ** fileTable) +{ + int mode; + int uid; + int gid; + int checkSum; + long size; + time_t mtime; + const char * name; + int cc; + BOOL hardLink; + BOOL softLink; + + /* + * If the block is completely empty, then this is the end of the + * archive file. If the name is null, then just skip this header. + */ + name = hp->name; + + if (*name == '\0') + { + for (cc = TAR_BLOCK_SIZE; cc > 0; cc--) + { + if (*name++) + return; + } + + eofFlag = TRUE; + + return; + } + + /* + * There is another file in the archive to examine. + * Extract the encoded information and check it. + */ + mode = getOctal(hp->mode, sizeof(hp->mode)); + uid = getOctal(hp->uid, sizeof(hp->uid)); + gid = getOctal(hp->gid, sizeof(hp->gid)); + size = getOctal(hp->size, sizeof(hp->size)); + mtime = getOctal(hp->mtime, sizeof(hp->mtime)); + checkSum = getOctal(hp->checkSum, sizeof(hp->checkSum)); + + if ((mode < 0) || (uid < 0) || (gid < 0) || (size < 0)) + { + if (!badHeader) + fprintf(stderr, "Bad tar header, skipping\n"); + + badHeader = TRUE; + + return; + } + + badHeader = FALSE; + skipFileFlag = FALSE; + + /* + * Check for the file modes. + */ + hardLink = ((hp->typeFlag == TAR_TYPE_HARD_LINK) || + (hp->typeFlag == TAR_TYPE_HARD_LINK - '0')); + + softLink = ((hp->typeFlag == TAR_TYPE_SOFT_LINK) || + (hp->typeFlag == TAR_TYPE_SOFT_LINK - '0')); + + /* + * Check for a directory or a regular file. + */ + if (name[strlen(name) - 1] == '/') + mode |= S_IFDIR; + else if ((mode & S_IFMT) == 0) + mode |= S_IFREG; + + /* + * Check for absolute paths in the file. + * If we find any, then warn the user and make them relative. + */ + if (*name == '/') + { + while (*name == '/') + name++; + + if (!warnedRoot) + { + fprintf(stderr, + "Absolute path detected, removing leading slashes\n"); + } + + warnedRoot = TRUE; + } + + /* + * See if we want this file to be restored. + * If not, then set up to skip it. + */ + if (!wantFileName(name, fileCount, fileTable)) + { + if (!hardLink && !softLink && S_ISREG(mode)) + { + inHeader = (size == 0); + dataCc = size; + } + + skipFileFlag = TRUE; + + return; + } + + /* + * This file is to be handled. + * If we aren't extracting then just list information about the file. + */ + if (!extractFlag) + { + if (verboseFlag) + { + printf("%s %3d/%-d %9ld %s %s", modeString(mode), + uid, gid, size, timeString(mtime), name); + } + else + printf("%s", name); + + if (hardLink) + printf(" (link to \"%s\")", hp->linkName); + else if (softLink) + printf(" (symlink to \"%s\")", hp->linkName); + else if (S_ISREG(mode)) + { + inHeader = (size == 0); + dataCc = size; + } + + printf("\n"); + + return; + } + + /* + * We really want to extract the file. + */ + if (verboseFlag) + printf("x %s\n", name); + + if (hardLink) + { + if (link(hp->linkName, name) < 0) + perror(name); + + return; + } + + if (softLink) + { +#ifdef S_ISLNK + if (symlink(hp->linkName, name) < 0) + perror(name); +#else + fprintf(stderr, "Cannot create symbolic links\n"); +#endif + return; + } + + /* + * If the file is a directory, then just create the path. + */ + if (S_ISDIR(mode)) + { + createPath(name, mode); + + return; + } + + /* + * There is a file to write. + * First create the path to it if necessary with a default permission. + */ + createPath(name, 0777); + + inHeader = (size == 0); + dataCc = size; + + /* + * Start the output file. + */ + if (tostdoutFlag==TRUE) + outFd = STDOUT; + else + outFd = open(name, O_WRONLY | O_CREAT | O_TRUNC, mode); + + if (outFd < 0) + { + perror(name); + skipFileFlag = TRUE; + return; + } + + /* + * If the file is empty, then that's all we need to do. + */ + if (size == 0 && tostdoutFlag == FALSE) + { + (void) close(outFd); + outFd = -1; + } +} + + +/* + * Handle a data block of some specified size that was read. + */ +static void +readData(const char * cp, int count) +{ + /* + * Reduce the amount of data left in this file. + * If there is no more data left, then we need to read + * the header again. + */ + dataCc -= count; + + if (dataCc <= 0) + inHeader = TRUE; + + /* + * If we aren't extracting files or this file is being + * skipped then do nothing more. + */ + if (!extractFlag || skipFileFlag) + return; + + /* + * Write the data to the output file. + */ + if (fullWrite(outFd, cp, count) < 0) + { + perror(outName); + if (tostdoutFlag==FALSE) { + (void) close(outFd); + outFd = -1; + } + skipFileFlag = TRUE; + return; + } + + /* + * If the write failed, close the file and disable further + * writes to this file. + */ + if (dataCc <= 0 && tostdoutFlag==FALSE) + { + if (close(outFd)) + perror(outName); + + outFd = -1; + } +} + + +/* + * Write a tar file containing the specified files. + */ +static void +writeTarFile(int fileCount, char ** fileTable) +{ + struct stat statbuf; + + /* + * Make sure there is at least one file specified. + */ + if (fileCount <= 0) + { + fprintf(stderr, "No files specified to be saved\n"); + errorFlag=TRUE; + } + + /* + * Create the tar file for writing. + */ + if ( (tarName==NULL) || !strcmp( tarName, "-") ) { + tostdoutFlag = TRUE; + tarFd = STDOUT; + } + else + tarFd = open(tarName, O_WRONLY | O_CREAT | O_TRUNC, 0666); + + if (tarFd < 0) + { + perror(tarName); + errorFlag=TRUE; + return; + } + + /* + * Get the device and inode of the tar file for checking later. + */ + if (fstat(tarFd, &statbuf) < 0) + { + perror(tarName); + errorFlag = TRUE; + goto done; + } + + tarDev = statbuf.st_dev; + tarInode = statbuf.st_ino; + + /* + * Append each file name into the archive file. + * Follow symbolic links for these top level file names. + */ + while (!errorFlag && (fileCount-- > 0)) + { + saveFile(*fileTable++, FALSE); + } + + /* + * Now write an empty block of zeroes to end the archive. + */ + writeTarBlock("", 1); + + +done: + /* + * Close the tar file and check for errors if it was opened. + */ + if ( (tostdoutFlag==FALSE) && (tarFd >= 0) && (close(tarFd) < 0)) + perror(tarName); +} + + +/* + * Save one file into the tar file. + * If the file is a directory, then this will recursively save all of + * the files and directories within the directory. The seeLinks + * flag indicates whether or not we want to see symbolic links as + * they really are, instead of blindly following them. + */ +static void +saveFile(const char * fileName, BOOL seeLinks) +{ + int status; + int mode; + struct stat statbuf; + + if (verboseFlag) + printf("a %s\n", fileName); + + /* + * Check that the file name will fit in the header. + */ + if (strlen(fileName) >= TAR_NAME_SIZE) + { + fprintf(stderr, "%s: File name is too long\n", fileName); + + return; + } + + /* + * Find out about the file. + */ +#ifdef S_ISLNK + if (seeLinks) + status = lstat(fileName, &statbuf); + else +#endif + status = stat(fileName, &statbuf); + + if (status < 0) + { + perror(fileName); + + return; + } + + /* + * Make sure we aren't trying to save our file into itself. + */ + if ((statbuf.st_dev == tarDev) && (statbuf.st_ino == tarInode)) + { + fprintf(stderr, "Skipping saving of archive file itself\n"); + + return; + } + + /* + * Check the type of file. + */ + mode = statbuf.st_mode; + + if (S_ISDIR(mode)) + { + saveDirectory(fileName, &statbuf); + + return; + } + + if (S_ISREG(mode)) + { + saveRegularFile(fileName, &statbuf); + + return; + } + + /* + * The file is a strange type of file, ignore it. + */ + fprintf(stderr, "%s: not a directory or regular file\n", fileName); +} + + +/* + * Save a regular file to the tar file. + */ +static void +saveRegularFile(const char * fileName, const struct stat * statbuf) +{ + BOOL sawEof; + int fileFd; + int cc; + int dataCount; + long fullDataCount; + char data[TAR_BLOCK_SIZE * 16]; + + /* + * Open the file for reading. + */ + fileFd = open(fileName, O_RDONLY); + + if (fileFd < 0) + { + perror(fileName); + + return; + } + + /* + * Write out the header for the file. + */ + writeHeader(fileName, statbuf); + + /* + * Write the data blocks of the file. + * We must be careful to write the amount of data that the stat + * buffer indicated, even if the file has changed size. Otherwise + * the tar file will be incorrect. + */ + fullDataCount = statbuf->st_size; + sawEof = FALSE; + + while (fullDataCount > 0) + { + /* + * Get the amount to write this iteration which is + * the minumum of the amount left to write and the + * buffer size. + */ + dataCount = sizeof(data); + + if (dataCount > fullDataCount) + dataCount = (int) fullDataCount; + + /* + * Read the data from the file if we haven't seen the + * end of file yet. + */ + cc = 0; + + if (!sawEof) + { + cc = fullRead(fileFd, data, dataCount); + + if (cc < 0) + { + perror(fileName); + + (void) close(fileFd); + errorFlag = TRUE; + + return; + } + + /* + * If the file ended too soon, complain and set + * a flag so we will zero fill the rest of it. + */ + if (cc < dataCount) + { + fprintf(stderr, + "%s: Short read - zero filling", + fileName); + + sawEof = TRUE; + } + } + + /* + * Zero fill the rest of the data if necessary. + */ + if (cc < dataCount) + memset(data + cc, 0, dataCount - cc); + + /* + * Write the buffer to the TAR file. + */ + writeTarBlock(data, dataCount); + + fullDataCount -= dataCount; + } + + /* + * Close the file. + */ + if ( (tostdoutFlag==FALSE) && close(fileFd) < 0) + fprintf(stderr, "%s: close: %s\n", fileName, strerror(errno)); +} + + +/* + * Save a directory and all of its files to the tar file. + */ +static void +saveDirectory(const char * dirName, const struct stat * statbuf) +{ + DIR * dir; + struct dirent * entry; + BOOL needSlash; + char fullName[PATH_LEN]; + + /* + * Construct the directory name as used in the tar file by appending + * a slash character to it. + */ + strcpy(fullName, dirName); + strcat(fullName, "/"); + + /* + * Write out the header for the directory entry. + */ + writeHeader(fullName, statbuf); + + /* + * Open the directory. + */ + dir = opendir(dirName); + + if (dir == NULL) + { + fprintf(stderr, "Cannot read directory \"%s\": %s\n", + dirName, strerror(errno)); + + return; + } + + /* + * See if a slash is needed. + */ + needSlash = (*dirName && (dirName[strlen(dirName) - 1] != '/')); + + /* + * Read all of the directory entries and check them, + * except for the current and parent directory entries. + */ + while (!errorFlag && ((entry = readdir(dir)) != NULL)) + { + if ((strcmp(entry->d_name, ".") == 0) || + (strcmp(entry->d_name, "..") == 0)) + { + continue; + } + + /* + * Build the full path name to the file. + */ + strcpy(fullName, dirName); + + if (needSlash) + strcat(fullName, "/"); + + strcat(fullName, entry->d_name); + + /* + * Write this file to the tar file, noticing whether or not + * the file is a symbolic link. + */ + saveFile(fullName, TRUE); + } + + /* + * All done, close the directory. + */ + closedir(dir); +} + + +/* + * Write a tar header for the specified file name and status. + * It is assumed that the file name fits. + */ +static void +writeHeader(const char * fileName, const struct stat * statbuf) +{ + long checkSum; + const unsigned char * cp; + int len; + TarHeader header; + + /* + * Zero the header block in preparation for filling it in. + */ + memset((char *) &header, 0, sizeof(header)); + + /* + * Fill in the header. + */ + strcpy(header.name, fileName); + + strncpy(header.magic, TAR_MAGIC, sizeof(header.magic)); + strncpy(header.version, TAR_VERSION, sizeof(header.version)); + + putOctal(header.mode, sizeof(header.mode), statbuf->st_mode & 0777); + putOctal(header.uid, sizeof(header.uid), statbuf->st_uid); + putOctal(header.gid, sizeof(header.gid), statbuf->st_gid); + putOctal(header.size, sizeof(header.size), statbuf->st_size); + putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime); + + header.typeFlag = TAR_TYPE_REGULAR; + + /* + * Calculate and store the checksum. + * This is the sum of all of the bytes of the header, + * with the checksum field itself treated as blanks. + */ + memset(header.checkSum, ' ', sizeof(header.checkSum)); + + cp = (const unsigned char *) &header; + len = sizeof(header); + checkSum = 0; + + while (len-- > 0) + checkSum += *cp++; + + putOctal(header.checkSum, sizeof(header.checkSum), checkSum); + + /* + * Write the tar header. + */ + writeTarBlock((const char *) &header, sizeof(header)); +} + + +/* + * Write data to one or more blocks of the tar file. + * The data is always padded out to a multiple of TAR_BLOCK_SIZE. + * The errorFlag static variable is set on an error. + */ +static void +writeTarBlock(const char * buf, int len) +{ + int partialLength; + int completeLength; + char fullBlock[TAR_BLOCK_SIZE]; + + /* + * If we had a write error before, then do nothing more. + */ + if (errorFlag) + return; + + /* + * Get the amount of complete and partial blocks. + */ + partialLength = len % TAR_BLOCK_SIZE; + completeLength = len - partialLength; + + /* + * Write all of the complete blocks. + */ + if ((completeLength > 0) && !fullWrite(tarFd, buf, completeLength)) + { + perror(tarName); + + errorFlag = TRUE; + + return; + } + + /* + * If there are no partial blocks left, we are done. + */ + if (partialLength == 0) + return; + + /* + * Copy the partial data into a complete block, and pad the rest + * of it with zeroes. + */ + memcpy(fullBlock, buf + completeLength, partialLength); + memset(fullBlock + partialLength, 0, TAR_BLOCK_SIZE - partialLength); + + /* + * Write the last complete block. + */ + if (!fullWrite(tarFd, fullBlock, TAR_BLOCK_SIZE)) + { + perror(tarName); + + errorFlag = TRUE; + } +} + + +/* + * Attempt to create the directories along the specified path, except for + * the final component. The mode is given for the final directory only, + * while all previous ones get default protections. Errors are not reported + * here, as failures to restore files can be reported later. + */ +static void +createPath(const char * name, int mode) +{ + char * cp; + char * cpOld; + char buf[TAR_NAME_SIZE]; + + strcpy(buf, name); + + cp = strchr(buf, '/'); + + while (cp) + { + cpOld = cp; + cp = strchr(cp + 1, '/'); + + *cpOld = '\0'; + + if (mkdir(buf, cp ? 0777 : mode) == 0) + printf("Directory \"%s\" created\n", buf); + + *cpOld = '/'; + } +} + + +/* + * Read an octal value in a field of the specified width, with optional + * spaces on both sides of the number and with an optional null character + * at the end. Returns -1 on an illegal format. + */ +static long +getOctal(const char * cp, int len) +{ + long val; + + while ((len > 0) && (*cp == ' ')) + { + cp++; + len--; + } + + if ((len == 0) || !isOctal(*cp)) + return -1; + + val = 0; + + while ((len > 0) && isOctal(*cp)) + { + val = val * 8 + *cp++ - '0'; + len--; + } + + while ((len > 0) && (*cp == ' ')) + { + cp++; + len--; + } + + if ((len > 0) && *cp) + return -1; + + return val; +} + + +/* + * Put an octal string into the specified buffer. + * The number is zero and space padded and possibly null padded. + * Returns TRUE if successful. + */ +static BOOL +putOctal(char * cp, int len, long value) +{ + int tempLength; + char * tempString; + char tempBuffer[32]; + + /* + * Create a string of the specified length with an initial space, + * leading zeroes and the octal number, and a trailing null. + */ + tempString = tempBuffer; + + sprintf(tempString, " %0*lo", len - 2, value); + + tempLength = strlen(tempString) + 1; + + /* + * If the string is too large, suppress the leading space. + */ + if (tempLength > len) + { + tempLength--; + tempString++; + } + + /* + * If the string is still too large, suppress the trailing null. + */ + if (tempLength > len) + tempLength--; + + /* + * If the string is still too large, fail. + */ + if (tempLength > len) + return FALSE; + + /* + * Copy the string to the field. + */ + memcpy(cp, tempString, len); + + return TRUE; +} + + +/* + * See if the specified file name belongs to one of the specified list + * of path prefixes. An empty list implies that all files are wanted. + * Returns TRUE if the file is selected. + */ +static BOOL +wantFileName(const char * fileName, int fileCount, char ** fileTable) +{ + const char * pathName; + int fileLength; + int pathLength; + + /* + * If there are no files in the list, then the file is wanted. + */ + if (fileCount == 0) + return TRUE; + + fileLength = strlen(fileName); + + /* + * Check each of the test paths. + */ + while (fileCount-- > 0) + { + pathName = *fileTable++; + + pathLength = strlen(pathName); + + if (fileLength < pathLength) + continue; + + if (memcmp(fileName, pathName, pathLength) != 0) + continue; + + if ((fileLength == pathLength) || + (fileName[pathLength] == '/')) + { + return TRUE; + } + } + + return FALSE; +} + + + +/* + * Return the standard ls-like mode string from a file mode. + * This is static and so is overwritten on each call. + */ +const char * +modeString(int mode) +{ + static char buf[12]; + + strcpy(buf, "----------"); + + /* + * Fill in the file type. + */ + if (S_ISDIR(mode)) + buf[0] = 'd'; + if (S_ISCHR(mode)) + buf[0] = 'c'; + if (S_ISBLK(mode)) + buf[0] = 'b'; + if (S_ISFIFO(mode)) + buf[0] = 'p'; +#ifdef S_ISLNK + if (S_ISLNK(mode)) + buf[0] = 'l'; +#endif +#ifdef S_ISSOCK + if (S_ISSOCK(mode)) + buf[0] = 's'; +#endif + + /* + * Now fill in the normal file permissions. + */ + if (mode & S_IRUSR) + buf[1] = 'r'; + if (mode & S_IWUSR) + buf[2] = 'w'; + if (mode & S_IXUSR) + buf[3] = 'x'; + if (mode & S_IRGRP) + buf[4] = 'r'; + if (mode & S_IWGRP) + buf[5] = 'w'; + if (mode & S_IXGRP) + buf[6] = 'x'; + if (mode & S_IROTH) + buf[7] = 'r'; + if (mode & S_IWOTH) + buf[8] = 'w'; + if (mode & S_IXOTH) + buf[9] = 'x'; + + /* + * Finally fill in magic stuff like suid and sticky text. + */ + if (mode & S_ISUID) + buf[3] = ((mode & S_IXUSR) ? 's' : 'S'); + if (mode & S_ISGID) + buf[6] = ((mode & S_IXGRP) ? 's' : 'S'); + if (mode & S_ISVTX) + buf[9] = ((mode & S_IXOTH) ? 't' : 'T'); + + return buf; +} + + +/* + * Get the time string to be used for a file. + * This is down to the minute for new files, but only the date for old files. + * The string is returned from a static buffer, and so is overwritten for + * each call. + */ +const char * +timeString(time_t timeVal) +{ + time_t now; + char * str; + static char buf[26]; + + time(&now); + + str = ctime(&timeVal); + + strcpy(buf, &str[4]); + buf[12] = '\0'; + + if ((timeVal > now) || (timeVal < now - 365*24*60*60L)) + { + strcpy(&buf[7], &str[20]); + buf[11] = '\0'; + } + + return buf; +} + + + +/* + * Write all of the supplied buffer out to a file. + * This does multiple writes as necessary. + * Returns the amount written, or -1 on an error. + */ +int +fullWrite(int fd, const char * buf, int len) +{ + int cc; + int total; + + total = 0; + + while (len > 0) + { + cc = write(fd, buf, len); + + if (cc < 0) + return -1; + + buf += cc; + total+= cc; + len -= cc; + } + + return total; +} + + +/* + * Read all of the supplied buffer from a file. + * This does multiple reads as necessary. + * Returns the amount read, or -1 on an error. + * A short read is returned on an end of file. + */ +int +fullRead(int fd, char * buf, int len) +{ + int cc; + int total; + + total = 0; + + while (len > 0) + { + cc = read(fd, buf, len); + + if (cc < 0) + return -1; + + if (cc == 0) + break; + + buf += cc; + total+= cc; + len -= cc; + } + + return total; +} + + + +#endif +/* END CODE */ + + |