From c1efe73569d429b49a9e6e1c9c72b947d414270c Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Tue, 30 Apr 2019 12:29:33 +0200 Subject: Add utility functions Signed-off-by: David Oberhollenzer --- lib/util/canonicalize_name.c | 56 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 lib/util/canonicalize_name.c (limited to 'lib/util/canonicalize_name.c') diff --git a/lib/util/canonicalize_name.c b/lib/util/canonicalize_name.c new file mode 100644 index 0000000..6703b66 --- /dev/null +++ b/lib/util/canonicalize_name.c @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +#include + +#include "util.h" + +int canonicalize_name(char *filename) +{ + char *ptr = filename; + int i; + + while (*ptr == '/') + ++ptr; + + if (ptr != filename) { + memmove(filename, ptr, strlen(ptr) + 1); + ptr = filename; + } + + while (*ptr != '\0') { + if (*ptr == '/') { + for (i = 0; ptr[i] == '/'; ++i) + ; + + if (i > 1) + memmove(ptr + 1, ptr + i, strlen(ptr + i) + 1); + } + + if (ptr[0] == '/' && ptr[1] == '\0') { + *ptr = '\0'; + break; + } + + ++ptr; + } + + ptr = filename; + + while (*ptr != '\0') { + if (ptr[0] == '.') { + if (ptr[1] == '/' || ptr[1] == '\0') + return -1; + + if (ptr[1] == '.' && + (ptr[2] == '/' || ptr[2] == '\0')) { + return -1; + } + } + + while (*ptr != '\0' && *ptr != '/') + ++ptr; + if (*ptr == '/') + ++ptr; + } + + return 0; +} -- cgit v1.2.3