From c0daad4aeb470fe2a24aa5d0d12f5ebb34aece4a Mon Sep 17 00:00:00 2001 From: Robert Pengelly Date: Thu, 26 Feb 2026 18:57:14 +0000 Subject: [PATCH] Initial commit --- LICENSE | 24 ++ Makefile.unix | 26 +++ Makefile.w32 | 19 ++ README.md | 23 ++ lib.c | 340 +++++++++++++++++++++++++++++ lib.h | 15 ++ report.c | 150 +++++++++++++ report.h | 29 +++ tar.c | 594 ++++++++++++++++++++++++++++++++++++++++++++++++++ tar.h | 20 ++ 10 files changed, 1240 insertions(+) create mode 100755 LICENSE create mode 100755 Makefile.unix create mode 100755 Makefile.w32 create mode 100755 README.md create mode 100755 lib.c create mode 100755 lib.h create mode 100755 report.c create mode 100755 report.h create mode 100755 tar.c create mode 100755 tar.h diff --git a/LICENSE b/LICENSE new file mode 100755 index 0000000..fdddb29 --- /dev/null +++ b/LICENSE @@ -0,0 +1,24 @@ +This is free and unencumbered software released into the public domain. + +Anyone is free to copy, modify, publish, use, compile, sell, or +distribute this software, either in source code form or as a compiled +binary, for any purpose, commercial or non-commercial, and by any +means. + +In jurisdictions that recognize copyright laws, the author or authors +of this software dedicate any and all copyright interest in the +software to the public domain. We make this dedication for the benefit +of the public at large and to the detriment of our heirs and +successors. We intend this dedication to be an overt act of +relinquishment in perpetuity of all present and future rights to this +software under copyright law. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR +OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, +ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +OTHER DEALINGS IN THE SOFTWARE. + +For more information, please refer to diff --git a/Makefile.unix b/Makefile.unix new file mode 100755 index 0000000..5b21898 --- /dev/null +++ b/Makefile.unix @@ -0,0 +1,26 @@ +#****************************************************************************** +# @file Makefile.unix +#****************************************************************************** +SRCDIR ?= $(CURDIR) +VPATH := $(SRCDIR) + +CC := gcc +CFLAGS := -D_FILE_OFFSET_BITS=64 -O2 -Wall -Werror -Wextra -ansi -pedantic -std=c90 + +CSRC := lib.c tar.c report.c + +ifeq ($(OS), Windows_NT) +all: tar.exe + +tar.exe: $(CSRC) + $(CC) $(CFLAGS) -o $@ $^ +else +all: tar + +tar: $(CSRC) + $(CC) $(CFLAGS) -o $@ $^ +endif + +clean: + if [ -f tar.exe ]; then rm -rf tar.exe; fi + if [ -f tar ]; then rm -rf tar; fi diff --git a/Makefile.w32 b/Makefile.w32 new file mode 100755 index 0000000..50641d5 --- /dev/null +++ b/Makefile.w32 @@ -0,0 +1,19 @@ +#****************************************************************************** +# @file Makefile.w32 +#****************************************************************************** +SRCDIR ?= $(CURDIR) +VPATH := $(SRCDIR) + +CC := gcc +CFLAGS := -D_FILE_OFFSET_BITS=64 -O2 -Wall -Werror -Wextra + +CSRC := lib.c tar.c report.c + +all: tar.exe + +clean: + if exist tar.exe ( del /q tar.exe ) + if exist tar ( del /q tar ) + +tar.exe: $(CSRC) + $(CC) $(CFLAGS) -o $@ $^ diff --git a/README.md b/README.md new file mode 100755 index 0000000..c192a0a --- /dev/null +++ b/README.md @@ -0,0 +1,23 @@ +All source code is Public Domain. + +## Obtain the source code + + git clone https://git.candlhat.org/tar.git + +## Building + + BSD: + + Make sure you have gcc and gmake installed then run gmake -f Makefile.unix. + + Linux: + + Make sure you have gcc and make installed then run make -f Makefile.unix. + + macOS: + + Make sure you have xcode command line tools installed then run make -f Makefile.unix. + + Windows: + + Make sure you have mingw installed and the location within your PATH variable then run mingw32-make.exe -f Makefile.w32. diff --git a/lib.c b/lib.c new file mode 100755 index 0000000..0e13aa4 --- /dev/null +++ b/lib.c @@ -0,0 +1,340 @@ +/****************************************************************************** + * @file lib.c + *****************************************************************************/ +#include +#include +#include + +#include "lib.h" +#include "report.h" +#include "tar.h" + +struct option { + + const char *name; + int index, flags; + +}; + +#define OPTION_NO_ARG 0x0001 +#define OPTION_HAS_ARG 0x0002 + +enum options { + + OPTION_IGNORED = 0, + OPTION_APPEND, + OPTION_CREATE, + OPTION_FILE, + OPTION_HELP, + OPTION_MODE, + OPTION_ROOT + +}; + +static struct option opts[] = { + + { "-C", OPTION_ROOT, OPTION_HAS_ARG }, + + { "-c", OPTION_CREATE, OPTION_NO_ARG }, + { "-f", OPTION_FILE, OPTION_HAS_ARG }, + { "-r", OPTION_APPEND, OPTION_NO_ARG }, + + { "--append", OPTION_APPEND, OPTION_NO_ARG }, + { "--create", OPTION_CREATE, OPTION_NO_ARG }, + { "--file", OPTION_FILE, OPTION_HAS_ARG }, + { "--help", OPTION_HELP, OPTION_NO_ARG }, + { "--mode", OPTION_MODE, OPTION_HAS_ARG }, + + { "--directory", OPTION_ROOT, OPTION_HAS_ARG }, + { 0, 0, 0 } + +}; + +static char *format_path (char *__str) { + + unsigned long len, i; + char *p = __str; + + len = strlen (p); + + for (i = 0; i < len; i++) { + + if (p[i] == '\\') { + p[i] = '/'; + } + + if (p[i] == '/') { + + i++; + + while (p[i] == '/' || p[i] == '\\') { + memmove (p + i, p + i + 1, strlen (p + i)); + } + + } + + } + + return xstrdup (p); + +} + +static int strstart (const char *val, const char **str) { + + const char *p = val; + const char *q = *str; + + while (*p != '\0') { + + if (*p != *q) { + return 0; + } + + ++p; + ++q; + + } + + *str = q; + return 1; + +} + +static void print_help (int exitval) { + + if (!program_name) { + goto _exit; + } + + fprintf (stderr, "Usage: %s [options] [file]...\n\n", program_name); + fprintf (stderr, "Options:\n\n"); + fprintf (stderr, " -c, --create Create a new archive.\n"); + /*fprintf (stderr, " -r, --append Append files to the end of the archive.\n");*/ + fprintf (stderr, "\n"); + fprintf (stderr, " -f ARCHIVE, --file ARCHIVE Use archive file or device ARCHIVE.\n"); + fprintf (stderr, " --help Print this help information.\n"); + fprintf (stderr, "\n"); + +_exit: + + exit (exitval); + +} + +char *xstrdup (const char *__str) { + + char *ptr = xmalloc (strlen (__str) + 1); + strcpy (ptr, __str); + + return ptr; + +} + +void dynarray_add (void *ptab, long *nb_ptr, void *data) { + + int nb, nb_alloc; + void **pp; + + nb = *nb_ptr; + pp = *(void ***) ptab; + + if ((nb & (nb - 1)) == 0) { + + if (!nb) { + nb_alloc = 1; + } else { + nb_alloc = nb * 2; + } + + pp = xrealloc (pp, nb_alloc * sizeof (void *)); + *(void ***) ptab = pp; + + } + + pp[nb++] = data; + *nb_ptr = nb; + +} + +void parse_args (int argc, char **argv, int optind) { + + const char *optarg, *r; + struct option *popt; + + if (optind >= argc) { + print_help (EXIT_FAILURE); + } + + while (optind < argc) { + + r = argv[optind++]; + + if (r[0] != '-' || r[1] == '\0') { + + char *p = xstrdup (r); + + dynarray_add (&state->paths, &state->nb_paths, format_path (p)); + free (p); + + continue; + + } + + for (popt = opts; popt; popt++) { + + const char *p1 = popt->name; + const char *r1 = r; + + if (!p1) { + + report_at (program_name, 0, REPORT_ERROR, "invalid option -- '%s'", r); + exit (EXIT_FAILURE); + + } + + if (!strstart (p1, &r1)) { + continue; + } + + optarg = r1; + + if (popt->flags & OPTION_HAS_ARG) { + + if (*optarg == '\0') { + + if (optind >= argc) { + + report_at (program_name, 0, REPORT_ERROR, "argument to '%s' is missing", r); + exit (EXIT_FAILURE); + + } + + optarg = argv[optind++]; + + } + + } else if (*optarg != '\0') { + continue; + } + + break; + + } + + switch (popt->index) { + + case OPTION_APPEND: { + + state->append = 1; + break; + + } + + case OPTION_CREATE: { + + state->create = 1; + break; + + } + + case OPTION_FILE: { + + if (state->target) { + + report_at (program_name, 0, REPORT_ERROR, "multiple archive files provided"); + exit (EXIT_FAILURE); + + } + + state->target = xstrdup (optarg); + break; + + } + + case OPTION_HELP: { + + print_help (EXIT_SUCCESS); + break; + + } + + case OPTION_MODE: { + + if (strlen (optarg) != 3 && strlen (optarg) != 4) { + + report_at (program_name, 0, REPORT_ERROR, "invalid mode provided"); + exit (EXIT_FAILURE); + + } + + if (state->mode) { free (state->mode); } + state->mode = xmalloc (5); + + if (strlen (optarg) == 3) { + + state->mode[0] = '0'; + memcpy (state->mode + 1, optarg, 3); + + } else { + memcpy (state->mode, optarg, 4); + } + + break; + + } + + case OPTION_ROOT: { + + char *p = xstrdup (optarg); + + if (state->root) { free (state->root); } + state->root = format_path (p); + + free (p); + break; + + } + + default: { + + report_at (program_name, 0, REPORT_ERROR, "unsupported option '%s'", r); + exit (EXIT_FAILURE); + + } + + } + + } + +} + +void *xmalloc (unsigned long __size) { + + void *p = malloc (__size); + + if (!p && __size) { + + report_at (program_name, 0, REPORT_ERROR, "failed to allocate %ld bytes of memory", __size); + exit (EXIT_FAILURE); + + } + + memset (p, 0, __size); + return p; + +} + +void *xrealloc (void *__ptr, unsigned long __size) { + + void *p = realloc (__ptr, __size); + + if (!p && __size) { + + report_at (program_name, 0, REPORT_ERROR, "failed to allocate %ld bytes of memory", __size); + exit (EXIT_FAILURE); + + } + + return p; + +} diff --git a/lib.h b/lib.h new file mode 100755 index 0000000..5f1506f --- /dev/null +++ b/lib.h @@ -0,0 +1,15 @@ +/****************************************************************************** + * @file lib.h + *****************************************************************************/ +#ifndef _LIB_H +#define _LIB_H + +char *xstrdup (const char *__str); + +void dynarray_add (void *ptab, long *nb_ptr, void *data); +void parse_args (int argc, char **argv, int optind); + +void *xmalloc (unsigned long __size); +void *xrealloc (void *__ptr, unsigned long __size); + +#endif /* _LIB_H */ diff --git a/report.c b/report.c new file mode 100755 index 0000000..8e128ef --- /dev/null +++ b/report.c @@ -0,0 +1,150 @@ +/****************************************************************************** + * @file report.c + *****************************************************************************/ +#include +#include +#include + +#include "report.h" + +unsigned long errors = 0; + +#ifndef __PDOS__ +#if defined (_WIN32) +# include +static int OriginalConsoleColor = -1; +#endif + +static void reset_console_color (void) { + +#if defined (_WIN32) + + HANDLE hStdError = GetStdHandle (STD_ERROR_HANDLE); + + if (OriginalConsoleColor == -1) { return; } + + SetConsoleTextAttribute (hStdError, OriginalConsoleColor); + OriginalConsoleColor = -1; + +#else + + fprintf (stderr, "\033[0m"); + +#endif + +} + +static void set_console_color (int color) { + +#if defined (_WIN32) + + HANDLE hStdError = GetStdHandle (STD_ERROR_HANDLE); + WORD wColor; + + if (OriginalConsoleColor == -1) { + + CONSOLE_SCREEN_BUFFER_INFO csbi; + + if (!GetConsoleScreenBufferInfo (hStdError, &csbi)) { + return; + } + + OriginalConsoleColor = csbi.wAttributes; + + } + + wColor = (OriginalConsoleColor & 0xF0) + (color & 0xF); + SetConsoleTextAttribute (hStdError, wColor); + +#else + + fprintf (stderr, "\033[%dm", color); + +#endif + +} +#endif + +static void output_message (const char *filename, unsigned long lineno, unsigned long idx, enum report_type type, const char *fmt, va_list ap) { + + if (filename) { + + if (lineno == 0 && idx == 0) { + fprintf (stderr, "%s: ", filename); + } else { + fprintf (stderr, "%s:", filename); + } + + } + + if (lineno > 0) { + + if (idx == 0) { + fprintf (stderr, "%lu: ", lineno); + } else { + fprintf (stderr, "%lu:", lineno); + } + + } + + if (idx > 0) { + fprintf (stderr, "%lu: ", idx); + } + + if (type == REPORT_ERROR || type == REPORT_FATAL_ERROR) { + +#ifndef __PDOS__ + set_console_color (COLOR_ERROR); +#endif + + if (type == REPORT_ERROR) { + fprintf (stderr, "error:"); + } else { + fprintf (stderr, "fatal error:"); + } + + } else if (type == REPORT_INTERNAL_ERROR) { + +#ifndef __PDOS__ + set_console_color (COLOR_INTERNAL_ERROR); +#endif + + fprintf (stderr, "internal error:"); + + } else if (type == REPORT_WARNING) { + +#ifndef __PDOS__ + set_console_color (COLOR_WARNING); +#endif + + fprintf (stderr, "warning:"); + + } + +#ifndef __PDOS__ + reset_console_color (); +#endif + + fprintf (stderr, " "); + vfprintf (stderr, fmt, ap); + fprintf (stderr, "\n"); + + if (type != REPORT_WARNING) { + ++errors; + } + +} + +unsigned long get_error_count (void) { + return errors; +} + +void report_at (const char *filename, unsigned long lineno, enum report_type type, const char *fmt, ...) { + + va_list ap; + + va_start (ap, fmt); + output_message (filename, lineno, 0, type, fmt, ap); + va_end (ap); + +} diff --git a/report.h b/report.h new file mode 100755 index 0000000..8fc8758 --- /dev/null +++ b/report.h @@ -0,0 +1,29 @@ +/****************************************************************************** + * @file report.h + *****************************************************************************/ +#ifndef _REPORT_H +#define _REPORT_H + +enum report_type { + + REPORT_ERROR = 0, + REPORT_FATAL_ERROR, + REPORT_INTERNAL_ERROR, + REPORT_WARNING + +}; + +#if defined (_WIN32) +# define COLOR_ERROR 12 +# define COLOR_WARNING 13 +# define COLOR_INTERNAL_ERROR 19 +#else +# define COLOR_ERROR 91 +# define COLOR_INTERNAL_ERROR 94 +# define COLOR_WARNING 95 +#endif + +unsigned long get_error_count (void); +void report_at (const char *filename, unsigned long line_number, enum report_type type, const char *fmt, ...); + +#endif /* _REPORT_H */ diff --git a/tar.c b/tar.c new file mode 100755 index 0000000..8ec2cb3 --- /dev/null +++ b/tar.c @@ -0,0 +1,594 @@ +/****************************************************************************** + * @file tar.c + *****************************************************************************/ +#include +#include +#include +#include +#include + +#include "lib.h" +#include "report.h" +#include "tar.h" + +struct tar_state *state = 0; +const char *program_name = 0; + +struct tar_raw_header { + + char name[100]; + char mode[8]; + char owner[8]; + char group[8]; + char size[12]; + char mtime[12]; + char checksum[8]; + char type; + char linkname[100]; + char _padding[255]; + +}; + +static unsigned int checksum (struct tar_raw_header *header) { + + unsigned char *p = (unsigned char *) header; + unsigned int res = 256, i; + + for (i = 0; i < offsetof (struct tar_raw_header, checksum); i++) { + res += p[i]; + } + + for (i = offsetof (struct tar_raw_header, type); i < sizeof (*header); i++) { + res += p[i]; + } + + return res; + +} + +static int write_null_bytes (FILE *fp, int n) { + + char nul = '\0'; + int i; + + for (i = 0; i < n; i++) { + + if (fwrite (&nul, 1, 1, fp) != 1) { + return 1; + } + + } + + return 0; + +} + +#if defined(__unix__) || defined(__unix) || (defined(__APPLE__) && defined(__MACH__)) +# include +# include +# include + +#ifndef S_IFDIR +# define S_IFDIR 0040000 +#endif + +#ifndef S_IFREG +# define S_IFREG 0100000 +#endif + +static void add_entry (FILE *tarfp, const char *root, const char *path) { + + struct tar_raw_header header; + struct stat stbuf; + + const char *p = path; + char *p2; + + unsigned long len; + int mode; + + while (*p == '/') { + p++; + } + + if (root) { + + len = strlen (root); + + if (root[len - 1] == '/') { + + len += (strlen (p) + 1); + + p2 = xmalloc (len); + sprintf (p2, "%s%s", root, p); + + } else { + + len += (1 + strlen (p) + 1); + + p2 = xmalloc (len); + sprintf (p2, "%s/%s", root, p); + + } + + } else { + p2 = xstrdup (path); + } + + if (stat (p2, &stbuf) < 0) { + + report_at (program_name, 0, REPORT_ERROR, "failed to stat '%s'", p); + return; + + } + + if (state->mode) { + + int o1, o2, o3; + + o1 = state->mode[1] - '0'; + o2 = state->mode[2] - '0'; + o3 = state->mode[3] - '0'; + + mode = (o1 << 6) | (o2 << 3) | o3; + + } else { + mode = stbuf.st_mode & 07777; + } + + memset (&header, 0, sizeof (header)); + strcpy (header.name, p); + + sprintf (header.mode, "%o", mode); + sprintf (header.owner, "%o", 0); + sprintf (header.mtime, "%o", 0); + + if (stbuf.st_mode & S_IFDIR) { + + DIR *dirp; + + struct dirent *de; + char *subpath; + + sprintf (header.size, "%o", 0); + header.type = '5'; /* MTAR_TDIR */ + + sprintf (header.checksum, "%06o", checksum (&header)); + header.checksum[7] = ' '; + + if (fwrite (&header, 1, sizeof (header), tarfp) != sizeof (header)) { + report_at (program_name, 0, REPORT_ERROR, "failed to write header to '%s'", state->target); + } + + if (!(dirp = opendir (p2))) { + + report_at (program_name, 0, REPORT_ERROR, "failed to open directory '%s'", p); + return; + + } + + while ((de = readdir (dirp))) { + + if (de->d_name[0] == '.' && (de->d_name[1] == '\0' || (de->d_name[1] == '.' && de->d_name[2] == '\0'))) { + continue; + } + + len = strlen (path); + + if (path[len - 1] == '/') { + + len += (strlen (de->d_name) + 1); + + if (!(subpath = malloc (len))) { + + report_at (program_name, 0, REPORT_ERROR, "failed to allocate memory for '%s'", de->d_name); + continue; + + } + + sprintf (subpath, "%s%s", path, de->d_name); + + } else { + + len += (1 + strlen (de->d_name) + 1); + + if (!(subpath = malloc (len))) { + + report_at (program_name, 0, REPORT_ERROR, "failed to allocate memory for '%s'", de->d_name); + continue; + + } + + sprintf (subpath, "%s/%s", path, de->d_name); + + } + + add_entry (tarfp, root, subpath); + free (subpath); + + } + + closedir (dirp); + + } else if (stbuf.st_mode & S_IFREG) { + + FILE *fp; + + unsigned char *data; + unsigned long bytes, read; + + if (!(fp = fopen (p2, "r+b"))) { + + report_at (program_name, 0, REPORT_ERROR, "failed to open '%s' for reading", path); + goto _end; + + } + + fseek (fp, 0, SEEK_END); + bytes = ftell (fp); + + fseek (fp, 0, SEEK_SET); + + sprintf (header.size, "%lo", bytes); + header.type = '0'; /* MTAR_TREG */ + + sprintf (header.checksum, "%06o", checksum (&header)); + header.checksum[7] = ' '; + + if (fwrite (&header, 1, sizeof (header), tarfp) != sizeof (header)) { + + report_at (program_name, 0, REPORT_ERROR, "failed to write header to '%s'", state->target); + fclose (fp); + + goto _end; + + } + + data = xmalloc (512); + + for (;;) { + + if (bytes == 0 || feof (fp)) { + break; + } + + read = (bytes > 512 ? 512 : bytes); + + if (fread (data, 1, read, fp) != read) { + + report_at (program_name, 0, REPORT_ERROR, "failed to read %lu bytes from %s", read, path); + break; + + } + + if (fwrite (data, 1, read, tarfp) != read) { + + report_at (program_name, 0, REPORT_ERROR, "failed to write %lu bytes to %s", read, state->target); + break; + + } + + bytes -= read; + + } + + bytes = (ftell (fp) % 512); + fclose (fp); + + if (bytes != 0) { + write_null_bytes (tarfp, 512 - bytes); + } + + } + +_end: + + free (p2); + +} +#elif defined (_WIN32) +# include + +static BOOL IsDirectory (LPCTSTR szPath) { + + DWORD dwAttrib = GetFileAttributes (szPath); + return (dwAttrib != INVALID_FILE_ATTRIBUTES && (dwAttrib & FILE_ATTRIBUTE_DIRECTORY)); + +} + +static void add_entry (FILE *tarfp, const char *root, const char *path) { + + struct tar_raw_header header; + + const char *p = path; + char *p2; + + unsigned long len; + int mode; + + if (isalpha ((int) p[0]) && p[1] == ':') { + p += 2; + } + + while (*p == '/') { + p++; + } + + if (root) { + + len = strlen (root); + + if (root[len - 1] == '/') { + + len += (strlen (p) + 1); + + p2 = xmalloc (len); + sprintf (p2, "%s%s", root, p); + + } else { + + len += (1 + strlen (p) + 1); + + p2 = xmalloc (len); + sprintf (p2, "%s/%s", root, p); + + } + + } else { + p2 = xstrdup (path); + } + + memset (&header, 0, sizeof (header)); + strcpy (header.name, p); + + sprintf (header.owner, "%o", 0); + sprintf (header.mtime, "%o", 0); + + if (state->mode) { + + int o1, o2, o3; + + o1 = state->mode[1] - '0'; + o2 = state->mode[2] - '0'; + o3 = state->mode[3] - '0'; + + mode = (o1 << 6) | (o2 << 3) | o3; + + } else { + mode = (IsDirectory (p2) ? 775 : 644); + } + + sprintf (header.mode, "%o", mode); + + if (IsDirectory (p2)) { + + char *subpath, *filename; + + HANDLE hFind; + WIN32_FIND_DATA FindFileData; + + sprintf (header.size, "%o", 0); + header.type = '5'; /* MTAR_TDIR */ + + sprintf (header.checksum, "%06o", checksum (&header)); + header.checksum[7] = ' '; + + if (fwrite (&header, 1, sizeof (header), tarfp) != sizeof (header)) { + report_at (program_name, 0, REPORT_ERROR, "failed to write header to '%s'", state->target); + } + + len = strlen (p2); + + if (p2[len - 1] == '/') { + + subpath = xmalloc (len + 5); + sprintf (subpath, "%s*.*", p2); + + } else { + + subpath = xmalloc (len + 6); + sprintf (subpath, "%s/*.*", p2); + + } + + if ((hFind = FindFirstFile (subpath, &FindFileData)) == INVALID_HANDLE_VALUE) { + + free (subpath); + return; + + } + + free (subpath); + + do { + + filename = FindFileData.cFileName; + + if (filename[0] == '.' && (filename[1] == '\0' || (filename[1] == '.' && filename[2] == '\0'))) { + continue; + } + + len = strlen (path); + + if (path[len - 1] == '/') { + + len += (strlen (filename) + 1); + + if (!(subpath = malloc (len))) { + + report_at (program_name, 0, REPORT_ERROR, "failed to allocate memory for '%s'", filename); + continue; + + } + + sprintf (subpath, "%s%s", path, filename); + + } else { + + len += (1 + strlen (filename) + 1); + + if (!(subpath = malloc (len))) { + + report_at (program_name, 0, REPORT_ERROR, "failed to allocate memory for '%s'", filename); + continue; + + } + + sprintf (subpath, "%s/%s", path, filename); + + } + + add_entry (tarfp, root, subpath); + free (subpath); + + } while (FindNextFile (hFind, &FindFileData) != 0); + + FindClose (hFind); + + } else { + + FILE *fp; + + unsigned char *data; + unsigned long bytes, read; + + if (!(fp = fopen (p2, "r+b"))) { + + report_at (program_name, 0, REPORT_ERROR, "failed to open '%s' for reading", path); + goto _end; + + } + + fseek (fp, 0, SEEK_END); + bytes = ftell (fp); + + fseek (fp, 0, SEEK_SET); + + sprintf (header.size, "%lo", bytes); + header.type = '0'; /* MTAR_TREG */ + + sprintf (header.checksum, "%06o", checksum (&header)); + header.checksum[7] = ' '; + + if (fwrite (&header, 1, sizeof (header), tarfp) != sizeof (header)) { + + report_at (program_name, 0, REPORT_ERROR, "failed to write header to '%s'", state->target); + fclose (fp); + + goto _end; + + } + + data = xmalloc (512); + + for (;;) { + + if (bytes == 0 || feof (fp)) { + break; + } + + read = (bytes > 512 ? 512 : bytes); + + if (fread (data, 1, read, fp) != read) { + + report_at (program_name, 0, REPORT_ERROR, "failed to read %lu bytes from %s", read, path); + break; + + } + + if (fwrite (data, 1, read, tarfp) != read) { + + report_at (program_name, 0, REPORT_ERROR, "failed to write %lu bytes to %s", read, state->target); + break; + + } + + bytes -= read; + + } + + bytes = ftell (fp) % 512; + fclose (fp); + + if (bytes != 0) { + write_null_bytes (tarfp, 512 - bytes); + } + + } + +_end: + + free (p2); + +} +#endif + + +int main (int argc, char **argv) { + + FILE *tarfp; + long i; + + char *mode; + int action; + + if (argc && *argv) { + + const char *p; + program_name = *argv; + + if ((p = strrchr (program_name, '/')) || (p = strrchr (program_name, '\\'))) { + program_name = (p + 1); + } + + } + + state = xmalloc (sizeof (*state)); + parse_args (argc, argv, 1); + + if (!state->target) { + + report_at (program_name, 0, REPORT_ERROR, "missing -f"); + return EXIT_FAILURE; + + } + + action = (state->create + state->append); + + if (action != 1) { + + if (action < 1) { + report_at (program_name, 0, REPORT_ERROR, "you must specify one of the '-cr' options"); + } else { + report_at (program_name, 0, REPORT_ERROR, "you may not specify more than one '-cr' option"); + } + + return EXIT_FAILURE; + + } + + if (state->create) { + mode = "w+b"; + } else { + mode = "r+b"; + } + + if (!(tarfp = fopen (state->target, mode))) { + + report_at (program_name, 0, REPORT_ERROR, "failed to open '%s'", state->target); + return EXIT_FAILURE; + + } + + if (state->append) { fseek (tarfp, 0, SEEK_END); } + + for (i = 0; i < state->nb_paths; i++) { + add_entry (tarfp, state->root, state->paths[i]); + } + + write_null_bytes (tarfp, sizeof (struct tar_raw_header) * 2); + + fclose (tarfp); + return (get_error_count () > 0 ? EXIT_FAILURE : EXIT_SUCCESS); + +} diff --git a/tar.h b/tar.h new file mode 100755 index 0000000..bf05a87 --- /dev/null +++ b/tar.h @@ -0,0 +1,20 @@ +/****************************************************************************** + * @file tar.h + *****************************************************************************/ +#ifndef _TAR_H +#define _TAR_H + +struct tar_state { + + char **paths; + long nb_paths; + + char *target, *root, *mode; + int append, create; + +}; + +extern struct tar_state *state; +extern const char *program_name; + +#endif /* _TAR_H */ -- 2.34.1