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REL2ABS(3) FreeBSD Library Functions Manual REL2ABS(3) NAME rel2abs - make an absolute path name from a relative path name SYNOPSIS char * rel2abs(const char *path, const char *base, char *result, size_t size); DESCRIPTION The rel2abs() function makes an absolute path name from a relative path name path based on a directory base and copies the resulting path name into the memory referenced by result. The result argument must refer to a buffer capable of storing at least size character The resulting path name may include symbolic links. abs2rel() doesn't check whether or not any path exists. RETURN VALUES The rel2abs() function returns absolute path name on success. If an error occurs, it returns NULL. EXAMPLES char result[MAXPATHLEN]; char *path = rel2abs("../../src/sys", "/usr/local/lib", result, MAXPATHLEN); yields: path == "/usr/src/sys" Similarly, path1 = rel2abs("src/sys", "/usr", result, MAXPATHLEN); path2 = rel2abs(".", "/usr/src/sys", result, MAXPATHLEN); yields: path1 == "/usr/src/sys" path2 == "/usr/src/sys" ERRORS The rel2abs() function may fail and set the external variable errno to indicate the error. [EINVAL] The base directory isn't an absolute path name or the size argument is zero. [ERANGE] The size argument is greater than zero but smaller than the length of the pathname plus 1 SEE ALSO abs2rel(3) AUTHORS Shigio Yamaguchi (shigio@tamacom.com) FreeBSD 14.0-RELEASE-p11 August 7, 2022 FreeBSD 14.0-RELEASE-p11