/* Copyright (C) 1991-2002, The Numerical Algorithms Group Ltd. All rights reserved. Copyright (C) 2007-2013, Gabriel Dos Reis. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of The Numerical Algorithms Group Ltd. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "openaxiom-c-macros.h" #include #include #include #include #include #include #include #include #include #include #ifdef OPENAXIOM_MS_WINDOWS_HOST # include #else # include # include #endif #include "cfuns.h" /* Most versions of Windows don't have the POSIX functions getuid(), geteuid(), getgid(), and getegid(). The following definitions are approximations, to patch for the deficiencies of Windows POSIX interface. */ #if !HAVE_DECL_GETUID # define getuid() 0 #endif #if !HAVE_DECL_GETGID # define getgid() 0 #endif #if !HAVE_DECL_GETEUID # define geteuid() getuid() #endif #if !HAVE_DECL_GETEGID # define getegid() getgid() #endif namespace OpenAxiom { OPENAXIOM_C_EXPORT int addtopath(char *dir) { char *path, *newpath; path = oa_getenv("PATH"); if (path == NULL) return -1; newpath = (char *) malloc(1 + strlen(path) + strlen(dir) + strlen("PATH=:")); if (newpath == NULL) return -1; sprintf(newpath, "PATH=%s:%s", path, dir); return putenv(newpath); } /* Returns 1 if `c' designates a path separator, 0 otherwise. */ static inline int openaxiom_is_path_separator(char c) { #ifdef OPENAXIOM_MS_WINDOWS_HOST return c == '\\' || c == '/'; #else return c == '/'; #endif } /* Returns a the dirname of `path'. If `path' has no separator, then returns ".". The returned value if malloc-allocated. */ OPENAXIOM_C_EXPORT char* oa_dirname(const char* path) { const int n = strlen(path); const char* mark = path + n; if (n == 0) return strdup("."); else if (n == 1 && openaxiom_is_path_separator(*path)) return strdup("/"); /* For "/banana/space/", we want "/banana". */ if (openaxiom_is_path_separator(*--mark)) --mark; while (path < mark && !openaxiom_is_path_separator(*mark)) --mark; if (path == mark) return strdup(openaxiom_is_path_separator(*path) ? "/" : "."); else { const int l = mark - path; char* dir = (char*) malloc(l + 1); memcpy(dir, path, l); dir[l] = '\0'; return dir; } } /* * Test whether the path is the name of a directory. Returns 1 if so, 0 if * not, -1 if it doesn't exist. */ OPENAXIOM_C_EXPORT int directoryp(char *path) { struct stat buf; int code = stat(path, &buf); return code == -1 ? -1 : S_ISDIR(buf.st_mode); } OPENAXIOM_C_EXPORT int make_path_from_file(char *s, char *t) { char *pos = NULL; char *c; /** simply copies the path name from t into s **/ for (c = t + strlen(t); c != s; c--) if (*c == '/') { pos = c; break; } /** Check to see if the path was actually present **/ if (c == t) { /** No Path, so return the pwd **/ return (-1); } /** now just do the copying **/ strncpy(s, t, pos - t); return 1; } /* The functions writeablep() and readablep() determine write and read access of a file designated by its name. The function axiom_has_write_access is a sub-routine of writeablep. The access is determined based on the POSIX semantics; see "Advanced Programming in the UNIX Environement", section 4.5. 1. If the effective user ID of the process is 0 (the superuser), access is allowed. This gives the superuser free rein throughout the entire file system. 2. If the effective user ID of the process equals the owner ID of the file (i.e., the process owns the file), access is allowed if the appropriate user access permission bit is set. [...] 3. If the effective group ID of the process or one of the supplementary group IDs of the process equals the group ID of the file, access is allowed if the appropriate group access permission bit is set. Otherwise, permission is denied. 4. If the appropriate other access permission bit is set, access is allowed. Otherwise, permission is defined. */ /* Return 1 if the process has write access of file as explained above. Otherwise, return 0. */ static inline int axiom_has_write_access(const struct stat* file_info) { uid_t effetive_uid = geteuid(); if (effetive_uid == 0) return 1; if (effetive_uid == file_info->st_uid) return (file_info->st_mode & S_IWUSR) ? 1 : 0; #ifdef S_IWGRP if (getegid() == file_info->st_gid) return (file_info->st_mode & S_IWGRP) ? 1 : 0; #endif #ifdef S_IWOTH return (file_info->st_mode & S_IWOTH) ? 1 : 0; #else return 0; #endif } /* Return -1 if the file designated by PATH is inexistent. 0 if the file exists but write access is denied. 1 if the file exists and process has write access. 2 if the file does not exists but process has write has write access to the dirname of path. */ OPENAXIOM_C_EXPORT int writeablep(const char *path) { struct stat buf; int code; code = stat(path, &buf); if (code == -1) { /* The file does not exist, so check to see if the directory is writable. */ char* dir = oa_dirname(path); code = stat(dir, &buf); /* FIXME: Work around MinGW/MSYS bug. The string pointed to by `dir' was strdup'd. According to the C standard, that means the the string was allocated by `malloc', therefore can be disposed of by `free'. However, the MinGW/MSYS port appears to use MS' StrDup as the real worker. Consequently, the guarantee that the the string can free'd no longer holds. We have to use MS's LocalFree. */ #ifdef OPENAXIOM_MS_WINDOWS_HOST LocalFree(dir); #else free(dir); #endif return (code == 0) && axiom_has_write_access(&buf) ? 2 : -1; } return axiom_has_write_access(&buf); } /* Return -1 if the file designated by PATH is inexistent. 0 if the file exists but process has no read access. 1 if the file exists and read access is granted. */ OPENAXIOM_C_EXPORT int readablep(const char *path) { struct stat buf; int code; code = stat(path, &buf); if (code == -1) return -1; if (geteuid() == buf.st_uid) return ((buf.st_mode & S_IREAD) != 0); #ifdef S_IRGRP if (getegid() == buf.st_gid) return ((buf.st_mode & S_IRGRP) != 0); #endif #ifdef S_IROTH return ((buf.st_mode & S_IROTH) != 0); #else return 0; #endif } OPENAXIOM_C_EXPORT long findString(char *file, char *string) { int nstring, charpos; FILE *fn; char buffer[1024]; if ((fn = fopen(file, "r")) == NULL) return -1; for (charpos = 0, nstring = strlen(string); fgets(buffer, sizeof buffer, fn) != NULL; charpos += strlen(buffer) ) if (!strncmp(buffer, string, nstring)) return charpos; return -1; } OPENAXIOM_C_EXPORT int copyEnvValue(char *varName, char *buffer) { char *s; s = oa_getenv(varName); if (s == NULL) return 0; strcpy(buffer, s); return strlen(s); } /* Return 1 if the file descriptor FD, as viewed by the Core Executable, is attached to a terminal. */ OPENAXIOM_C_EXPORT int std_stream_is_terminal(int fd) { assert(fd > -1 && fd < 3); #ifdef OPENAXIOM_MS_WINDOWS_HOST DWORD handle; switch (fd) { case 0: handle = STD_INPUT_HANDLE; break; case 1: handle = STD_OUTPUT_HANDLE; break; case 2: handle = STD_ERROR_HANDLE; break; /* Next code is never executed but it makes the compiler happy. */ default: return 0; } /* The MS documentation suggests `GetFileType' for determining the nature of the file handle. The return value, in our case, is an over approximation of what we are interested in: Are we dealing with a stream connected to a terminal? The constant FILE_TYPE_CHAR characterises character files; in particular a console terminal, or a printer. There is an undocumented function `VerifyConsoleIoHandle' to deal precisely with the case we are interested in. However, while availale in Wine, it is not available in the MinGW headers. Consequently, we cannot rely on it for the moment. So, we may still get garbage out of this function on MS platforms. */ return GetFileType(GetStdHandle(handle)) == FILE_TYPE_CHAR; #else return isatty(fd); #endif } /* Change the process' curretnt directory. Return zero on success, and -1 on failure. */ OPENAXIOM_C_EXPORT int oa_chdir(const char* path) { #ifdef OPENAXIOM_MS_WINDOWS_HOST return SetCurrentDirectory(path) ? 0 : -1; #else return chdir(path); #endif /* OPENAXIOM_MS_WINDOWS_HOST */ } /* return true if path is `.' or `..'. */ static inline int is_dot_or_dotdot(const char* path) { return strcmp(path, ".") == 0 || strcmp(path, "..") == 0; } /* Remove a directory entry. Files are removed, directories are recursively walked and removed. Return 0 on success, and -1 on falure. In practice, OpenAxiom does not remove directories with non-trivial recursive structues. */ OPENAXIOM_C_EXPORT int oa_unlink(const char* path) { const char* curdir; int status = -1; #ifdef OPENAXIOM_MS_WINDOWS_HOST WIN32_FIND_DATA findData; HANDLE walkHandle; if (is_dot_or_dotdot(path)) return -1; walkHandle = FindFirstFile(path, &findData); if (walkHandle == INVALID_HANDLE_VALUE) return -1; /* Remember where we are so we can return back properly. */ curdir = oa_getcwd(); do { if (is_dot_or_dotdot(findData.cFileName)) continue; if (findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) { if ((status = oa_chdir(findData.cFileName)) < 0) goto sortie; if ((status = oa_unlink("*")) < 0) goto sortie; if ((status = oa_chdir("..")) < 0) goto sortie; if(!RemoveDirectory(findData.cFileName)) { status = -1; goto sortie; } } else if (!DeleteFile(findData.cFileName)) { status = -1; goto sortie; } status = 0; } while (FindNextFile(walkHandle, &findData)); if (!FindClose(walkHandle)) { status = -1; goto sortie; } #else struct stat pathstat; DIR* dir; struct dirent* entry; /* Don't ever try to remove `.' or `..'. */ if (is_dot_or_dotdot(path)) return -1; if (stat(path, &pathstat) < 0) return -1; /* handle non directories first. */ if (!S_ISDIR(pathstat.st_mode)) return unlink(path); /* change into the path so that we don't have to form full pathnames. */ curdir = oa_getcwd(); if ((dir = opendir(path)) == NULL || oa_chdir(path) < 0) goto sortie; while (errno = 0, (entry = readdir(dir)) != NULL) { struct stat s; if (is_dot_or_dotdot(entry->d_name)) continue; if ((status = stat(entry->d_name, &s)) < 0) goto sortie; if (S_ISDIR(s.st_mode)) { if ((status = oa_unlink(entry->d_name)) < 0) goto sortie; } else if ((status = unlink(entry->d_name)) < 0) goto sortie; } if (errno != 0) { status = -1; goto sortie; } /* Now, get one level up, and remove the empty directory. */ if (oa_chdir("..") < 0 || closedir(dir) < 0 || rmdir(path) < 0) status = -1; else status = 0; #endif /* OPENAXIOM_MS_WINDOWS_HOST */ sortie: oa_chdir(curdir); free((char*) curdir); return status; } OPENAXIOM_C_EXPORT const char* oa_acquire_temporary_pathname() { #if OPENAXIOM_MS_WINDOWS_HOST char buf[MAX_PATH]; const char* tmpdir = oa_get_tmpdir(); auto n = GetTempFileName(tmpdir, "oa-", random() % SHRT_MAX, buf); /* tmpdir was malloc()ed when OPENAXIOM_MS_WINDOWS_HOST. */ free(const_cast(tmpdir)); if (n == 0) { perror("oa_acquire_temporary_pathname"); exit(1); } return strdup(buf); #elif HAVE_DECL_MKTEMP return mktemp(strdup((std::string{ oa_get_tmpdir() } + "/oa-XXXXXX").c_str())); #elif HAVE_DECL_TEMPNAM return tempnam(oa_get_tmpdir(), "oa-"); #else return strdup(("oa-" + std::to_string(random())).c_str()); #endif } OPENAXIOM_C_EXPORT void oa_release_temporary_pathname(const char* s) { free(const_cast(s)); // yuck! } /* Rename a file or directory. */ OPENAXIOM_C_EXPORT int oa_rename(const char* old_path, const char* new_path) { #ifdef OPENAXIOM_MS_WINDOWS_HOST return MoveFile(old_path, new_path) ? 0 : -1; #else return rename(old_path, new_path); #endif } /* Create a new directory named `path'. Return 0 on success, and -1 on failure. */ OPENAXIOM_C_EXPORT int oa_mkdir(const char* path) { #ifdef OPENAXIOM_MS_WINDOWS_HOST return CreateDirectory(path, NULL) ? 0 : -1; #else # define DIRECTORY_PERM ((S_IRWXU|S_IRWXG|S_IRWXO) & ~(S_IWGRP|S_IWOTH)) return mkdir (path, DIRECTORY_PERM); # undef DIRECTORY_PERM #endif } /* Run a shell command. Effectively forward to C's system(). */ OPENAXIOM_C_EXPORT int oa_system(const char* cmd) { return system(cmd); } OPENAXIOM_C_EXPORT int oa_getpid(void) { #ifdef OPENAXIOM_MS_WINDOWS_HOST return GetCurrentProcessId(); #else return getpid(); #endif } /* Concatenate two strings and return a pointer to the newly allocate resulting string. */ OPENAXIOM_C_EXPORT const char* oa_concatenate_string(const char* lhs, const char* rhs) { if (lhs == NULL) return rhs; else if (rhs == NULL) return lhs; else { const int lhs_length = strlen(lhs); char* result = (char*) malloc(lhs_length + strlen(rhs) + 1); strcpy(result, lhs); strcpy(result + lhs_length, rhs); return result; } } /* Return a string object that is the result of catenating the strings designated by `left' and `right'. */ OPENAXIOM_C_EXPORT const char* oa_strcat(const char* left, const char* right) { int left_size = strlen(left); int right_size = strlen(right); int size = left_size + right_size; char* buffer = (char*) malloc(size + 1); memcpy(buffer, left, left_size); memcpy(buffer + left_size, right, right_size); buffer[size] = '\0'; return buffer; } /* Return the value of an environment variable. */ OPENAXIOM_C_EXPORT char* oa_getenv(const char* var) { #ifdef OPENAXIOM_MS_WINDOWS_HOST #define BUFSIZE 128 char* buf = (char*) malloc(BUFSIZE); int len = GetEnvironmentVariable(var, buf, BUFSIZE); if (len == 0) { free(buf); return NULL; } else if (len > BUFSIZE) { buf = (char*) realloc(buf,len); len = GetEnvironmentVariable(var, buf, len); if (len == 0) { free(buf); return NULL; } } return buf; #else return getenv(var); #endif } /* Set the value of environment variable VAR to VAL. Return 1 on success, and 0 otherwise. */ OPENAXIOM_C_EXPORT int oa_setenv(const char* var, const char* val) { #ifdef OPENAXIOM_MS_WINDOWS_HOST return SetEnvironmentVariable(var, val); #elif HAVE_DECL_SETENV return !setenv(var, val, true); #else const int var_length = strlen(var); const int val_length = strlen(val); char* str = (char*) malloc(var_length + 1 + val_length + 1); strcpy(str, var); str[var_length] = '='; strcpy(str + var_length + 1, val); str[var_length + 1 + val_length] = '\0'; return !putenv(str); #endif } OPENAXIOM_C_EXPORT char* oa_getcwd(void) { size_t bufsz = 256; char* buf = (char*) malloc(bufsz); #ifdef OPENAXIOM_MS_WINDOWS_HOST DWORD n = GetCurrentDirectory(bufsz, buf); if (n == 0) { perror("oa_getcwd"); exit(-1); } else if (n > bufsz) { buf = (char*) realloc(buf,n); if (GetCurrentDirectory(n, buf) != n) { perror("oa_getcwd"); exit(-1); } } return buf; #else /* OPENAXIOM_MS_WINDOWS_HOST */ errno = 0; while (getcwd(buf,bufsz) == 0) { if (errno == ERANGE) { errno = 0; bufsz *= 2; buf = (char*) realloc(buf, bufsz); } else { perror("oa_getcwd"); exit(-1); } } return buf; #endif } OPENAXIOM_C_EXPORT int oa_access_file_for_read(const char* path) { #ifdef OPENAXIOM_MS_WINDOWS_HOST return GetFileAttributes(path) == INVALID_FILE_ATTRIBUTES ? -1 : 1; #else return access(path, R_OK); #endif } OPENAXIOM_C_EXPORT const char* oa_get_tmpdir(void) { #ifdef OPENAXIOM_MS_WINDOWS_HOST char* buf; /* First, probe. */ int bufsz = GetTempPath(0, NULL); if (bufsz == 0) { perror("oa_get_tmpdir"); exit(1); } else { int new_size; buf = (char*) malloc(bufsz + 1); new_size = GetTempPath(bufsz, buf); if(new_size == 0 || new_size >= bufsz) { perror("oa_get_tmpdir"); free(buf); exit(1); } buf[new_size] = '\0'; } return buf; #else return "/tmp"; #endif } OPENAXIOM_C_EXPORT int oa_copy_file(const char* src, const char* dst) { #ifdef OPENAXIOM_MS_WINDOWS_HOST return CopyFile(src,dst, /* bFailIfExists = */ 0) ? 0 : -1; #else #define OA_BUFSZ 512 #define OA_DEFAULT_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) char buf[OA_BUFSZ]; int src_fd; int dst_fd; int count; if((src_fd = open(src, O_RDONLY)) < 0) return -1; if ((dst_fd = creat(dst, OA_DEFAULT_MODE)) < 0) { close(src_fd); return -1; } while ((count = read(src_fd, buf, OA_BUFSZ)) > 0) if (write(dst_fd, buf, count) != count) break; #undef OA_DEFAULT_MODE #undef OA_BUFSZ return (close(dst_fd) < 0 || close(src_fd) < 0 || count < 0) ? -1 : 0; #endif } OPENAXIOM_C_EXPORT double plus_infinity(void ) { #ifdef INFINITY return INFINITY; #else /* This must be a curious platform. */ volatile double zero = 0.0; return 1.0 / zero; /* If it traps, well, it traps. */ #endif } OPENAXIOM_C_EXPORT double minus_infinity(void) { return -plus_infinity(); } OPENAXIOM_C_EXPORT double quiet_double_NaN(void) { #ifdef NAN return NAN; #else return sqrt(-1.0); /* Just pick one. */ #endif } OPENAXIOM_C_EXPORT Byteorder oa_get_host_byteorder(void) { #ifdef WORDS_BIGENDIAN return Byteorder::big; #else return Byteorder::little; #endif } OPENAXIOM_C_EXPORT void oa_allocate_process_argv(Process* proc, int argc) { proc->argc = argc; proc->argv = (char**) malloc((1 + argc) * sizeof (char*)); proc->argv[argc] = NULL; } OPENAXIOM_C_EXPORT int oa_spawn(Process* proc, SpawnFlags flags) { #ifdef OPENAXIOM_MS_WINDOWS_HOST const char* path = NULL; char* cmd_line = NULL; int curpos = strlen(proc->argv[0]); int cmd_line_length = curpos; int i; PROCESS_INFORMATION proc_info; STARTUPINFO startup_info = { 0 }; DWORD status; for (i = 0; i < proc->argc; ++i) cmd_line_length += 1 + strlen(proc->argv[i]); cmd_line = (char*) malloc(cmd_line_length + 1); strcpy(cmd_line, proc->argv[0]); for (i = 0; i < proc->argc; ++i) { cmd_line[curpos++] = ' '; strcpy(cmd_line + curpos, proc->argv[i]); curpos += strlen(proc->argv[i]); } cmd_line[curpos] = '\0'; if ((flags & SpawnFlags::search_path) == 0) path = proc->argv[0]; if(CreateProcess(/* lpApplicationName */ path, /* lpCommandLine */ cmd_line, /* lpProcessAttributes */ NULL, /* lpThreadAttributes */ NULL, /* bInheritHandles */ TRUE, /* dwCreationFlags */ 0, /* lpEnvironment */ NULL, /* lpCurrentDirectory */ NULL, /* lpstartupInfo */ &startup_info, /* lpProcessInformation */ &proc_info) == 0) { fprintf(stderr, "oa_spawn: error %lu\n", GetLastError()); return proc->id = -1; } proc->id = proc_info.dwProcessId; if ((flags & SpawnFlags::replace) == 0) return proc->id; WaitForSingleObject(proc_info.hProcess, INFINITE); GetExitCodeProcess(proc_info.hProcess, &status); CloseHandle(proc_info.hThread); CloseHandle(proc_info.hProcess); return status; #else proc->id = 0; if ((flags & SpawnFlags::replace) == 0) proc->id = fork(); if (proc->id == 0) { if (flags & SpawnFlags::search_path) execvp(proc->argv[0], proc->argv); else execv(proc->argv[0], proc->argv); perror(strerror(errno)); /* Don't keep useless clones around. */ if ((flags & SpawnFlags::replace) == 0) exit(-1); } return proc->id; #endif } OPENAXIOM_C_EXPORT char* oa_substr(const char* str, const size_t begin, const size_t end) { char* substring; int len; if (str == NULL || strlen(str) == 0 || strlen(str) < begin || end >= strlen(str) || begin > end) return NULL; len = (end - begin) + 2; substring = (char*) malloc(len * sizeof(char)); memset(substring,'\0',len); memcpy(substring, str+begin, len-1); return substring; } OPENAXIOM_C_EXPORT char** oa_split(const char* sequence, const char* delimiter, int* size) { int sequence_length = 0, newsize = 0; char* token; char** tokens = NULL; char* sequence_copy; sequence_length = strlen(sequence); sequence_copy = (char*) malloc((sequence_length + 1) * sizeof(char*)); strcpy(sequence_copy,sequence); sequence_copy[sequence_length] = '\0'; token = strtok(sequence_copy, delimiter); while (token != NULL) { tokens = (char**) realloc(tokens,(newsize + 1) * sizeof(char*)); tokens[newsize] = token; newsize++; token = strtok (NULL, delimiter); } *size = newsize; return tokens; } }