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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgfortran/] [intrinsics/] [chmod.c] - Rev 760
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/* Implementation of the CHMOD intrinsic. Copyright (C) 2006, 2007, 2009, 2012 Free Software Foundation, Inc. Contributed by François-Xavier Coudert <coudert@clipper.ens.fr> This file is part of the GNU Fortran runtime library (libgfortran). Libgfortran is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Libgfortran is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #include "libgfortran.h" #if defined(HAVE_SYS_STAT_H) #include <stdbool.h> #include <string.h> /* For memcpy. */ #include <sys/stat.h> /* For stat, chmod and umask. */ /* INTEGER FUNCTION CHMOD (NAME, MODE) CHARACTER(len=*), INTENT(IN) :: NAME, MODE Sets the file permission "chmod" using a mode string. For MinGW, only _S_IWRITE and _S_IREAD are supported. To set those, only the user attributes are used. The mode string allows for the same arguments as POSIX's chmod utility. a) string containing an octal number. b) Comma separated list of clauses of the form: [<who-list>]<op>[<perm-list>|<permcopy>][<op>[<perm-list>|<permcopy>],...] <who> - 'u', 'g', 'o', 'a' <op> - '+', '-', '=' <perm> - 'r', 'w', 'x', 'X', 's', t' If <op> is not followed by a perm-list or permcopy, '-' and '+' do not change the mode while '=' clears all file mode bits. 'u' stands for the user permissions, 'g' for the group and 'o' for the permissions for others. 'a' is equivalent to 'ugo'. '+' sets the given permission in addition to the ones of the file, '-' unsets the given permissions of the file, while '=' sets the file to that mode. 'r' sets the read, 'w' the write, and 'x' the execute mode. 'X' sets the execute bit if the file is a directory or if the user, group or other executable bit is set. 't' sets the sticky bit, 's' (un)sets the and/or S_ISUID/S_ISGID bit. Note that if <who> is omitted, the permissions are filtered by the umask. A return value of 0 indicates success, -1 an error of chmod() while 1 indicates a mode parsing error. */ extern int chmod_func (char *, char *, gfc_charlen_type, gfc_charlen_type); export_proto(chmod_func); int chmod_func (char *name, char *mode, gfc_charlen_type name_len, gfc_charlen_type mode_len) { char * file; int i; bool ugo[3]; bool rwxXstugo[9]; int set_mode, part; bool is_dir, honor_umask, continue_clause = false; mode_t mode_mask, file_mode, new_mode; struct stat stat_buf; /* Trim trailing spaces of the file name. */ while (name_len > 0 && name[name_len - 1] == ' ') name_len--; /* Make a null terminated copy of the file name. */ file = gfc_alloca (name_len + 1); memcpy (file, name, name_len); file[name_len] = '\0'; if (mode_len == 0) return 1; if (mode[0] >= '0' && mode[0] <= '9') { #ifdef __MINGW32__ unsigned mode; if (sscanf (mode, "%o", &mode) != 1) return 1; file_mode = (mode_t) mode; #else if (sscanf (mode, "%o", &file_mode) != 1) return 1; #endif return chmod (file, file_mode); } /* Read the current file mode. */ if (stat (file, &stat_buf)) return 1; file_mode = stat_buf.st_mode & ~S_IFMT; is_dir = stat_buf.st_mode & S_IFDIR; #ifdef HAVE_UMASK /* Obtain the umask without distroying the setting. */ mode_mask = 0; mode_mask = umask (mode_mask); (void) umask (mode_mask); #else honor_umask = false; #endif for (i = 0; i < mode_len; i++) { if (!continue_clause) { ugo[0] = false; ugo[1] = false; ugo[2] = false; #ifdef HAVE_UMASK honor_umask = true; #endif } continue_clause = false; rwxXstugo[0] = false; rwxXstugo[1] = false; rwxXstugo[2] = false; rwxXstugo[3] = false; rwxXstugo[4] = false; rwxXstugo[5] = false; rwxXstugo[6] = false; rwxXstugo[7] = false; rwxXstugo[8] = false; rwxXstugo[9] = false; part = 0; set_mode = -1; for (; i < mode_len; i++) { switch (mode[i]) { /* User setting: a[ll]/u[ser]/g[roup]/o[ther]. */ case 'a': if (part > 1) return 1; ugo[0] = true; ugo[1] = true; ugo[2] = true; part = 1; #ifdef HAVE_UMASK honor_umask = false; #endif break; case 'u': if (part == 2) { rwxXstugo[6] = true; part = 4; break; } if (part > 1) return 1; ugo[0] = true; part = 1; #ifdef HAVE_UMASK honor_umask = false; #endif break; case 'g': if (part == 2) { rwxXstugo[7] = true; part = 4; break; } if (part > 1) return 1; ugo[1] = true; part = 1; #ifdef HAVE_UMASK honor_umask = false; #endif break; case 'o': if (part == 2) { rwxXstugo[8] = true; part = 4; break; } if (part > 1) return 1; ugo[2] = true; part = 1; #ifdef HAVE_UMASK honor_umask = false; #endif break; /* Mode setting: =+-. */ case '=': if (part > 2) { continue_clause = true; i--; part = 2; goto clause_done; } set_mode = 1; part = 2; break; case '-': if (part > 2) { continue_clause = true; i--; part = 2; goto clause_done; } set_mode = 2; part = 2; break; case '+': if (part > 2) { continue_clause = true; i--; part = 2; goto clause_done; } set_mode = 3; part = 2; break; /* Permissions: rwxXst - for ugo see above. */ case 'r': if (part != 2 && part != 3) return 1; rwxXstugo[0] = true; part = 3; break; case 'w': if (part != 2 && part != 3) return 1; rwxXstugo[1] = true; part = 3; break; case 'x': if (part != 2 && part != 3) return 1; rwxXstugo[2] = true; part = 3; break; case 'X': if (part != 2 && part != 3) return 1; rwxXstugo[3] = true; part = 3; break; case 's': if (part != 2 && part != 3) return 1; rwxXstugo[4] = true; part = 3; break; case 't': if (part != 2 && part != 3) return 1; rwxXstugo[5] = true; part = 3; break; /* Tailing blanks are valid in Fortran. */ case ' ': for (i++; i < mode_len; i++) if (mode[i] != ' ') break; if (i != mode_len) return 1; goto clause_done; case ',': goto clause_done; default: return 1; } } clause_done: if (part < 2) return 1; new_mode = 0; #ifdef __MINGW32__ /* Read. */ if (rwxXstugo[0] && (ugo[0] || honor_umask)) new_mode |= _S_IREAD; /* Write. */ if (rwxXstugo[1] && (ugo[0] || honor_umask)) new_mode |= _S_IWRITE; #else /* Read. */ if (rwxXstugo[0]) { if (ugo[0] || honor_umask) new_mode |= S_IRUSR; if (ugo[1] || honor_umask) new_mode |= S_IRGRP; if (ugo[2] || honor_umask) new_mode |= S_IROTH; } /* Write. */ if (rwxXstugo[1]) { if (ugo[0] || honor_umask) new_mode |= S_IWUSR; if (ugo[1] || honor_umask) new_mode |= S_IWGRP; if (ugo[2] || honor_umask) new_mode |= S_IWOTH; } /* Execute. */ if (rwxXstugo[2]) { if (ugo[0] || honor_umask) new_mode |= S_IXUSR; if (ugo[1] || honor_umask) new_mode |= S_IXGRP; if (ugo[2] || honor_umask) new_mode |= S_IXOTH; } /* 'X' execute. */ if (rwxXstugo[3] && (is_dir || (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))) new_mode |= (S_IXUSR | S_IXGRP | S_IXOTH); /* 's'. */ if (rwxXstugo[4]) { if (ugo[0] || honor_umask) new_mode |= S_ISUID; if (ugo[1] || honor_umask) new_mode |= S_ISGID; } /* As original 'u'. */ if (rwxXstugo[6]) { if (ugo[1] || honor_umask) { if (file_mode & S_IRUSR) new_mode |= S_IRGRP; if (file_mode & S_IWUSR) new_mode |= S_IWGRP; if (file_mode & S_IXUSR) new_mode |= S_IXGRP; } if (ugo[2] || honor_umask) { if (file_mode & S_IRUSR) new_mode |= S_IROTH; if (file_mode & S_IWUSR) new_mode |= S_IWOTH; if (file_mode & S_IXUSR) new_mode |= S_IXOTH; } } /* As original 'g'. */ if (rwxXstugo[7]) { if (ugo[0] || honor_umask) { if (file_mode & S_IRGRP) new_mode |= S_IRUSR; if (file_mode & S_IWGRP) new_mode |= S_IWUSR; if (file_mode & S_IXGRP) new_mode |= S_IXUSR; } if (ugo[2] || honor_umask) { if (file_mode & S_IRGRP) new_mode |= S_IROTH; if (file_mode & S_IWGRP) new_mode |= S_IWOTH; if (file_mode & S_IXGRP) new_mode |= S_IXOTH; } } /* As original 'o'. */ if (rwxXstugo[8]) { if (ugo[0] || honor_umask) { if (file_mode & S_IROTH) new_mode |= S_IRUSR; if (file_mode & S_IWOTH) new_mode |= S_IWUSR; if (file_mode & S_IXOTH) new_mode |= S_IXUSR; } if (ugo[1] || honor_umask) { if (file_mode & S_IROTH) new_mode |= S_IRGRP; if (file_mode & S_IWOTH) new_mode |= S_IWGRP; if (file_mode & S_IXOTH) new_mode |= S_IXGRP; } } #endif /* __MINGW32__ */ #ifdef HAVE_UMASK if (honor_umask) new_mode &= ~mode_mask; #endif if (set_mode == 1) { #ifdef __MINGW32__ if (ugo[0] || honor_umask) file_mode = (file_mode & ~(_S_IWRITE | _S_IREAD)) | (new_mode & (_S_IWRITE | _S_IREAD)); #else /* Set '='. */ if ((ugo[0] || honor_umask) && !rwxXstugo[6]) file_mode = (file_mode & ~(S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR)) | (new_mode & (S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR)); if ((ugo[1] || honor_umask) && !rwxXstugo[7]) file_mode = (file_mode & ~(S_ISGID | S_IRGRP | S_IWGRP | S_IXGRP)) | (new_mode & (S_ISGID | S_IRGRP | S_IWGRP | S_IXGRP)); if ((ugo[2] || honor_umask) && !rwxXstugo[8]) file_mode = (file_mode & ~(S_IROTH | S_IWOTH | S_IXOTH)) | (new_mode & (S_IROTH | S_IWOTH | S_IXOTH)); if (is_dir && rwxXstugo[5]) file_mode |= S_ISVTX; else if (!is_dir) file_mode &= ~S_ISVTX; #endif } else if (set_mode == 2) { /* Clear '-'. */ file_mode &= ~new_mode; #ifndef __MINGW32__ if (rwxXstugo[5] || !is_dir) file_mode &= ~S_ISVTX; #endif } else if (set_mode == 3) { file_mode |= new_mode; #ifndef __MINGW32__ if (rwxXstugo[5] && is_dir) file_mode |= S_ISVTX; else if (!is_dir) file_mode &= ~S_ISVTX; #endif } } return chmod (file, file_mode); } extern void chmod_i4_sub (char *, char *, GFC_INTEGER_4 *, gfc_charlen_type, gfc_charlen_type); export_proto(chmod_i4_sub); void chmod_i4_sub (char *name, char *mode, GFC_INTEGER_4 * status, gfc_charlen_type name_len, gfc_charlen_type mode_len) { int val; val = chmod_func (name, mode, name_len, mode_len); if (status) *status = val; } extern void chmod_i8_sub (char *, char *, GFC_INTEGER_8 *, gfc_charlen_type, gfc_charlen_type); export_proto(chmod_i8_sub); void chmod_i8_sub (char *name, char *mode, GFC_INTEGER_8 * status, gfc_charlen_type name_len, gfc_charlen_type mode_len) { int val; val = chmod_func (name, mode, name_len, mode_len); if (status) *status = val; } #endif
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