X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Frelocatable.c;h=a7bbd99dca78be9628ac6a0edef175a822bcbe93;hb=4fe68d4176b4f0da64660bb9ce0f5412a6bb24de;hp=e814a0e4ebd620d09e44f6df05425fdcb507bc48;hpb=1146b210ba48607a5a29ea516a5cda3d5afa6542;p=gnulib.git diff --git a/lib/relocatable.c b/lib/relocatable.c index e814a0e4e..a7bbd99dc 100644 --- a/lib/relocatable.c +++ b/lib/relocatable.c @@ -1,5 +1,5 @@ /* Provide relocatable packages. - Copyright (C) 2003-2006, 2008 Free Software Foundation, Inc. + Copyright (C) 2003-2006, 2008-2011 Free Software Foundation, Inc. Written by Bruno Haible , 2003. This program is free software; you can redistribute it and/or modify it @@ -22,9 +22,10 @@ This must come before because may include , and once has been included, it's too late. */ #ifndef _GNU_SOURCE -# define _GNU_SOURCE 1 +# define _GNU_SOURCE 1 #endif +#define _GL_USE_STDLIB_ALLOC 1 #include /* Specification. */ @@ -43,7 +44,7 @@ # include "xalloc.h" #endif -#if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ +#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__ # define WIN32_LEAN_AND_MEAN # include #endif @@ -70,8 +71,8 @@ ISSLASH(C) tests whether C is a directory separator character. IS_PATH_WITH_DIR(P) tests whether P contains a directory specification. */ -#if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ - /* Win32, Cygwin, OS/2, DOS */ +#if ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __EMX__ || defined __DJGPP__ + /* Win32, OS/2, DOS */ # define ISSLASH(C) ((C) == '/' || (C) == '\\') # define HAS_DEVICE(P) \ ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \ @@ -102,11 +103,11 @@ static size_t curr_prefix_len; instead of "/"). */ static void set_this_relocation_prefix (const char *orig_prefix_arg, - const char *curr_prefix_arg) + const char *curr_prefix_arg) { if (orig_prefix_arg != NULL && curr_prefix_arg != NULL /* Optimization: if orig_prefix and curr_prefix are equal, the - relocation is a nop. */ + relocation is a nop. */ && strcmp (orig_prefix_arg, curr_prefix_arg) != 0) { /* Duplicate the argument strings. */ @@ -118,14 +119,14 @@ set_this_relocation_prefix (const char *orig_prefix_arg, #ifdef NO_XMALLOC if (memory != NULL) #endif - { - memcpy (memory, orig_prefix_arg, orig_prefix_len + 1); - orig_prefix = memory; - memory += orig_prefix_len + 1; - memcpy (memory, curr_prefix_arg, curr_prefix_len + 1); - curr_prefix = memory; - return; - } + { + memcpy (memory, orig_prefix_arg, orig_prefix_len + 1); + orig_prefix = memory; + memory += orig_prefix_len + 1; + memcpy (memory, curr_prefix_arg, curr_prefix_len + 1); + curr_prefix = memory; + return; + } } orig_prefix = NULL; curr_prefix = NULL; @@ -168,8 +169,8 @@ static #endif char * compute_curr_prefix (const char *orig_installprefix, - const char *orig_installdir, - const char *curr_pathname) + const char *orig_installdir, + const char *curr_pathname) { char *curr_installdir; const char *rel_installdir; @@ -194,9 +195,9 @@ compute_curr_prefix (const char *orig_installprefix, while (p > p_base) { - p--; - if (ISSLASH (*p)) - break; + p--; + if (ISSLASH (*p)) + break; } q = (char *) xmalloc (p - curr_pathname + 1); @@ -219,46 +220,46 @@ compute_curr_prefix (const char *orig_installprefix, while (rp > rel_installdir && cp > cp_base) { - bool same = false; - const char *rpi = rp; - const char *cpi = cp; - - while (rpi > rel_installdir && cpi > cp_base) - { - rpi--; - cpi--; - if (ISSLASH (*rpi) || ISSLASH (*cpi)) - { - if (ISSLASH (*rpi) && ISSLASH (*cpi)) - same = true; - break; - } - /* Do case-insensitive comparison if the filesystem is always or - often case-insensitive. It's better to accept the comparison - if the difference is only in case, rather than to fail. */ + bool same = false; + const char *rpi = rp; + const char *cpi = cp; + + while (rpi > rel_installdir && cpi > cp_base) + { + rpi--; + cpi--; + if (ISSLASH (*rpi) || ISSLASH (*cpi)) + { + if (ISSLASH (*rpi) && ISSLASH (*cpi)) + same = true; + break; + } + /* Do case-insensitive comparison if the file system is always or + often case-insensitive. It's better to accept the comparison + if the difference is only in case, rather than to fail. */ #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ - /* Win32, Cygwin, OS/2, DOS - case insignificant filesystem */ - if ((*rpi >= 'a' && *rpi <= 'z' ? *rpi - 'a' + 'A' : *rpi) - != (*cpi >= 'a' && *cpi <= 'z' ? *cpi - 'a' + 'A' : *cpi)) - break; + /* Win32, Cygwin, OS/2, DOS - case insignificant file system */ + if ((*rpi >= 'a' && *rpi <= 'z' ? *rpi - 'a' + 'A' : *rpi) + != (*cpi >= 'a' && *cpi <= 'z' ? *cpi - 'a' + 'A' : *cpi)) + break; #else - if (*rpi != *cpi) - break; + if (*rpi != *cpi) + break; #endif - } - if (!same) - break; - /* The last pathname component was the same. opi and cpi now point - to the slash before it. */ - rp = rpi; - cp = cpi; + } + if (!same) + break; + /* The last pathname component was the same. opi and cpi now point + to the slash before it. */ + rp = rpi; + cp = cpi; } if (rp > rel_installdir) { - /* Unexpected: The curr_installdir does not end with rel_installdir. */ - free (curr_installdir); - return NULL; + /* Unexpected: The curr_installdir does not end with rel_installdir. */ + free (curr_installdir); + return NULL; } { @@ -268,10 +269,10 @@ compute_curr_prefix (const char *orig_installprefix, curr_prefix = (char *) xmalloc (curr_prefix_len + 1); #ifdef NO_XMALLOC if (curr_prefix == NULL) - { - free (curr_installdir); - return NULL; - } + { + free (curr_installdir); + return NULL; + } #endif memcpy (curr_prefix, curr_installdir, curr_prefix_len); curr_prefix[curr_prefix_len] = '\0'; @@ -290,7 +291,12 @@ compute_curr_prefix (const char *orig_installprefix, /* Full pathname of shared library, or NULL. */ static char *shared_library_fullname; -#if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ +#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__ +/* Native Win32 only. + On Cygwin, it is better to use the Cygwin provided /proc interface, than + to use native Win32 API and cygwin_conv_to_posix_path, because it supports + longer file names + (see ). */ /* Determine the full pathname of the shared library when it is loaded. */ @@ -305,44 +311,28 @@ DllMain (HINSTANCE module_handle, DWORD event, LPVOID reserved) static char location[MAX_PATH]; if (!GetModuleFileName (module_handle, location, sizeof (location))) - /* Shouldn't happen. */ - return FALSE; + /* Shouldn't happen. */ + return FALSE; if (!IS_PATH_WITH_DIR (location)) - /* Shouldn't happen. */ - return FALSE; + /* Shouldn't happen. */ + return FALSE; - { -#if defined __CYGWIN__ - /* On Cygwin, we need to convert paths coming from Win32 system calls - to the Unix-like slashified notation. */ - static char location_as_posix_path[2 * MAX_PATH]; - /* There's no error return defined for cygwin_conv_to_posix_path. - See cygwin-api/func-cygwin-conv-to-posix-path.html. - Does it overflow the buffer of expected size MAX_PATH or does it - truncate the path? I don't know. Let's catch both. */ - cygwin_conv_to_posix_path (location, location_as_posix_path); - location_as_posix_path[MAX_PATH - 1] = '\0'; - if (strlen (location_as_posix_path) >= MAX_PATH - 1) - /* A sign of buffer overflow or path truncation. */ - return FALSE; - shared_library_fullname = strdup (location_as_posix_path); -#else - shared_library_fullname = strdup (location); -#endif - } + shared_library_fullname = strdup (location); } return TRUE; } -#else /* Unix except Cygwin */ +#else /* Unix */ static void find_shared_library_fullname () { -#if defined __linux__ && __GLIBC__ >= 2 - /* Linux has /proc/self/maps. glibc 2 has the getline() function. */ +#if (defined __linux__ && (__GLIBC__ >= 2 || defined __UCLIBC__)) || defined __CYGWIN__ + /* Linux has /proc/self/maps. glibc 2 and uClibc have the getline() + function. + Cygwin >= 1.5 has /proc/self/maps and the getline() function too. */ FILE *fp; /* Open the current process' maps file. It describes one VMA per line. */ @@ -351,43 +341,43 @@ find_shared_library_fullname () { unsigned long address = (unsigned long) &find_shared_library_fullname; for (;;) - { - unsigned long start, end; - int c; - - if (fscanf (fp, "%lx-%lx", &start, &end) != 2) - break; - if (address >= start && address <= end - 1) - { - /* Found it. Now see if this line contains a filename. */ - while (c = getc (fp), c != EOF && c != '\n' && c != '/') - continue; - if (c == '/') - { - size_t size; - int len; - - ungetc (c, fp); - shared_library_fullname = NULL; size = 0; - len = getline (&shared_library_fullname, &size, fp); - if (len >= 0) - { - /* Success: filled shared_library_fullname. */ - if (len > 0 && shared_library_fullname[len - 1] == '\n') - shared_library_fullname[len - 1] = '\0'; - } - } - break; - } - while (c = getc (fp), c != EOF && c != '\n') - continue; - } + { + unsigned long start, end; + int c; + + if (fscanf (fp, "%lx-%lx", &start, &end) != 2) + break; + if (address >= start && address <= end - 1) + { + /* Found it. Now see if this line contains a filename. */ + while (c = getc (fp), c != EOF && c != '\n' && c != '/') + continue; + if (c == '/') + { + size_t size; + int len; + + ungetc (c, fp); + shared_library_fullname = NULL; size = 0; + len = getline (&shared_library_fullname, &size, fp); + if (len >= 0) + { + /* Success: filled shared_library_fullname. */ + if (len > 0 && shared_library_fullname[len - 1] == '\n') + shared_library_fullname[len - 1] = '\0'; + } + } + break; + } + while (c = getc (fp), c != EOF && c != '\n') + continue; + } fclose (fp); } #endif } -#endif /* (WIN32 or Cygwin) / (Unix except Cygwin) */ +#endif /* WIN32 / Unix */ /* Return the full pathname of the current shared library. Return NULL if unknown. @@ -395,7 +385,7 @@ find_shared_library_fullname () static char * get_shared_library_fullname () { -#if !(defined _WIN32 || defined __WIN32__ || defined __CYGWIN__) +#if !((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) static bool tried_find_shared_library_fullname; if (!tried_find_shared_library_fullname) { @@ -409,7 +399,9 @@ get_shared_library_fullname () #endif /* PIC */ /* Returns the pathname, relocated according to the current installation - directory. */ + directory. + The returned string is either PATHNAME unmodified or a freshly allocated + string that you can free with free() after casting it to 'char *'. */ const char * relocate (const char *pathname) { @@ -420,59 +412,69 @@ relocate (const char *pathname) if (!initialized) { /* At this point, orig_prefix and curr_prefix likely have already been - set through the main program's set_program_name_and_installdir - function. This is sufficient in the case that the library has - initially been installed in the same orig_prefix. But we can do - better, to also cover the cases that 1. it has been installed - in a different prefix before being moved to orig_prefix and (later) - to curr_prefix, 2. unlike the program, it has not moved away from - orig_prefix. */ + set through the main program's set_program_name_and_installdir + function. This is sufficient in the case that the library has + initially been installed in the same orig_prefix. But we can do + better, to also cover the cases that 1. it has been installed + in a different prefix before being moved to orig_prefix and (later) + to curr_prefix, 2. unlike the program, it has not moved away from + orig_prefix. */ const char *orig_installprefix = INSTALLPREFIX; const char *orig_installdir = INSTALLDIR; char *curr_prefix_better; curr_prefix_better = - compute_curr_prefix (orig_installprefix, orig_installdir, - get_shared_library_fullname ()); + compute_curr_prefix (orig_installprefix, orig_installdir, + get_shared_library_fullname ()); set_relocation_prefix (orig_installprefix, - curr_prefix_better != NULL - ? curr_prefix_better - : curr_prefix); + curr_prefix_better != NULL + ? curr_prefix_better + : curr_prefix); if (curr_prefix_better != NULL) - free (curr_prefix_better); + free (curr_prefix_better); initialized = 1; } #endif /* Note: It is not necessary to perform case insensitive comparison here, - even for DOS-like filesystems, because the pathname argument was + even for DOS-like file systems, because the pathname argument was typically created from the same Makefile variable as orig_prefix came from. */ if (orig_prefix != NULL && curr_prefix != NULL && strncmp (pathname, orig_prefix, orig_prefix_len) == 0) { if (pathname[orig_prefix_len] == '\0') - /* pathname equals orig_prefix. */ - return curr_prefix; - if (ISSLASH (pathname[orig_prefix_len])) - { - /* pathname starts with orig_prefix. */ - const char *pathname_tail = &pathname[orig_prefix_len]; - char *result = - (char *) xmalloc (curr_prefix_len + strlen (pathname_tail) + 1); + { + /* pathname equals orig_prefix. */ + char *result = (char *) xmalloc (strlen (curr_prefix) + 1); + +#ifdef NO_XMALLOC + if (result != NULL) +#endif + { + strcpy (result, curr_prefix); + return result; + } + } + else if (ISSLASH (pathname[orig_prefix_len])) + { + /* pathname starts with orig_prefix. */ + const char *pathname_tail = &pathname[orig_prefix_len]; + char *result = + (char *) xmalloc (curr_prefix_len + strlen (pathname_tail) + 1); #ifdef NO_XMALLOC - if (result != NULL) + if (result != NULL) #endif - { - memcpy (result, curr_prefix, curr_prefix_len); - strcpy (result + curr_prefix_len, pathname_tail); - return result; - } - } + { + memcpy (result, curr_prefix, curr_prefix_len); + strcpy (result + curr_prefix_len, pathname_tail); + return result; + } + } } /* Nothing to relocate. */ return pathname;