diff options
Diffstat (limited to 'gcc/cppfiles.c')
| -rw-r--r-- | gcc/cppfiles.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/gcc/cppfiles.c b/gcc/cppfiles.c index 5092b91..b43d280 100644 --- a/gcc/cppfiles.c +++ b/gcc/cppfiles.c @@ -683,11 +683,27 @@ finclude (pfile, fd, ihash) fp = CPP_BUFFER (pfile); + /* If fd points to a plain file, we know how big it is, so we can + allocate the buffer all at once. If fd is a pipe or terminal, we + can't. Most C source files are 4k or less, so we guess that. If + fd is something weird, like a block device or a directory, we + don't want to read it at all. + + Unfortunately, different systems use different st.st_mode values + for pipes: some have S_ISFIFO, some S_ISSOCK, some are buggy and + zero the entire struct stat except a couple fields. Hence the + mess below. + + In all cases, read_and_prescan will resize the buffer if it + turns out there's more data than we thought. */ + if (S_ISREG (st.st_mode)) { /* off_t might have a wider range than size_t - in other words, the max size of a file might be bigger than the address - space, and we need to detect that now. */ + space. We can't handle a file that large. (Anyone with + a single source file bigger than 4GB needs to rethink + their coding style.) */ st_size = (size_t) st.st_size; if ((unsigned HOST_WIDE_INT) st_size != (unsigned HOST_WIDE_INT) st.st_size) @@ -696,7 +712,11 @@ finclude (pfile, fd, ihash) goto fail; } } - else if (S_ISFIFO (st.st_mode) || (S_ISCHR (st.st_mode) && isatty (fd))) + else if (S_ISFIFO (st.st_mode) || S_ISSOCK (st.st_mode) + /* Some 4.x (x<4) derivatives have a bug that makes fstat() of a + socket or pipe return a stat struct with most fields zeroed. */ + || (st.st_mode == 0 && st.st_nlink == 0 && st.st_size == 0) + || (S_ISCHR (st.st_mode) && isatty (fd))) { /* Cannot get its file size before reading. 4k is a decent first guess. */ @@ -743,6 +763,11 @@ finclude (pfile, fd, ihash) return 0; } +/* Given a path FNAME, extract the directory component and place it + onto the actual_dirs list. Return a pointer to the allocated + file_name_list structure. These structures are used to implement + current-directory "" include searching. */ + static struct file_name_list * actual_directory (pfile, fname) cpp_reader *pfile; |