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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [realpath.c] - Rev 859
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/* realpath.c - Return the canonicalized absolute pathname */ /* Written 2000 by Werner Almesberger */ #include <stdlib.h> #include <unistd.h> #include <string.h> #include <limits.h> #include <errno.h> #include <sys/stat.h> /* FIXME: buffer overrun possible, loops forever on cyclic symlinks */ /* * Canonical name: never ends with a slash */ static int resolve_path(char *path,char *result,char *pos) { if (*path == '/') { *result = '/'; pos = result+1; path++; } *pos = 0; if (!*path) return 0; while (1) { char *slash; struct stat st; slash = *path ? strchr(path,'/') : NULL; if (slash) *slash = 0; if (!path[0] || (path[0] == '.' && (!path[1] || (path[1] == '.' && !path[2])))) { pos--; if (pos != result && path[0] && path[1]) while (*--pos != '/'); } else { strcpy(pos,path); if (lstat(result,&st) < 0) return -1; if (S_ISLNK(st.st_mode)) { char buf[PATH_MAX]; if (readlink(result,buf,sizeof(buf)) < 0) return -1; *pos = 0; if (slash) { *slash = '/'; strcat(buf,slash); } strcpy(path,buf); if (*path == '/') result[1] = 0; pos = strchr(result,0); continue; } pos = strchr(result,0); } if (slash) { *pos++ = '/'; path = slash+1; } *pos = 0; if (!slash) break; } return 0; } char *realpath(const char *path,char *resolved_path) { char cwd[PATH_MAX]; char *path_copy; int res; if (!*path) { errno = ENOENT; /* SUSv2 */ return NULL; } if (!getcwd(cwd,sizeof(cwd))) return NULL; strcpy(resolved_path,"/"); if (resolve_path(cwd,resolved_path,resolved_path)) return NULL; strcat(resolved_path,"/"); path_copy = strdup(path); if (!path_copy) return NULL; res = resolve_path(path_copy,resolved_path,strchr(resolved_path,0)); free(path_copy); if (res) return NULL; return resolved_path; }
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