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change GetProgPath() to return full & resolved binary path
GetProgPath() now resolves the path derived from argv[0] always via realpath(3p) to its real location in the filesystem, and returns the path including binary name, effectively making it work like windows' GetModuleFileName(), so we can re-use the existing code to strip the trailing binary name. since symlinks are now always resolved, we no longer need the special case code for linux to use /proc/self/exe for this purpose.
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@ -232,44 +232,32 @@ static int SearchPathBin(const char* bin, char* buf, size_t buflen)
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static char* MyDirname(char* in)
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/* returns the dirname() part of a filename.
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** the passed string is modified in place, then returned.
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*/
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{
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char* p = strrchr (in, '/');
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if (p) {
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*p = 0;
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}
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return in;
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}
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static char* GetProgPath(char* pathbuf, char* a0)
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/* search for the full path of the binary using the argv[0] parameter
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** passed to int main(), according to the description above.
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** if the binary was started using a relative path, realpath(3p) will
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** turn the relative path into an absolute path with pwd resolved, and
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** gratuitous path components such as "./" or ".." removed.
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**
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** the binary name will be passed to realpath(3p) to have all symlinks
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** resolved and gratuitous path components like "../" removed.
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**
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** argument "pathbuf" is a work buffer of size PATH_MAX,
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** "a0" the original argv[0].
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** returns pathbuf with the full path of the binary, minus the binary
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** name itself.
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** returns pathbuf with the full path of the binary.
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*/
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{
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if (a0[0] == '/') {
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strcpy (pathbuf, a0);
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} else if (a0[0] == '.' || strrchr (a0, '/')) {
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char tmp[PATH_MAX];
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if (!strchr(a0, '/')) {
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/* path doesn't contain directory separator, so it was looked up
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via PATH environment variable */
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SearchPathBin (a0, tmp, PATH_MAX);
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a0 = tmp;
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}
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/* realpath returns the work buffer passed to it, so checking the
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return value is superfluous. gcc11 warns anyway. */
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if (realpath (a0, pathbuf)) {}
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} else {
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SearchPathBin (a0, pathbuf, PATH_MAX);
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}
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return MyDirname(pathbuf);
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return pathbuf;
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}
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#endif
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@ -289,31 +277,18 @@ void AddSubSearchPathFromBin (SearchPaths* P, const char* SubDir)
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return;
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}
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/* Remove binary name */
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Ptr = strrchr (Dir, '\\');
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if (Ptr == 0) {
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return;
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}
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*Ptr = '\0';
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#else
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#elif defined(__linux__)
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/* reading from proc will return the real location, excluding symlinked
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pathes - which is needed for certain edgy cases */
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if (readlink("/proc/self/exe", Dir, sizeof(Dir) - 1) < 0) {
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GetProgPath(Dir, ArgVec[0]);
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} else {
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#endif
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/* Remove binary name */
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Ptr = strrchr (Dir, PATHSEP[0]);
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if (Ptr == 0) {
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return;
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}
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*Ptr = '\0';
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}
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#else
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GetProgPath(Dir, ArgVec[0]);
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#endif
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/* Check for 'bin' directory */
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Ptr = strrchr (Dir, PATHSEP[0]);
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