diff options
Diffstat (limited to '')
-rw-r--r-- | makefile.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/makefile.c b/makefile.c new file mode 100644 index 0000000..ef280b9 --- /dev/null +++ b/makefile.c @@ -0,0 +1,89 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +static const char *const default_makefiles[] = { + "makefile", + "Makefile" +}; + + +int +open_default_makefile(const char **pathp) +{ + int fd; + size_t i; + + /* The specification says that the alternatives “shall be + * tried”, but it uses the phrase “if neither … are found”, + * implying that make(1) shall fail if a file cannot be + * opened and only try the next alternative if it failed + * becomes the file does not exist. + */ + + for (i = 0; i < ELEMSOF(default_makefiles); i++) { + *pathp = default_makefiles[i]; + fd = open(*pathp, O_RDONLY); + if (fd >= 0) { + printinfof(WC_MAKEFILE, "found standard makefile to use: %s", *pathp); + goto find_existing_fallbacks; + } else if (errno != ENOENT) { + eprintf("found standard makefile to use, but failed to open: %s:", *pathp); + } + } + + printerrorf("couldn't find any makefile to use, portable " + "alternatives are ./makefile and ./Makefile"); + +find_existing_fallbacks: + for (i++; i < ELEMSOF(default_makefiles); i++) + if (!access(default_makefiles[i], F_OK)) + warnf_warning(WC_EXTRA_MAKEFILE, "found additional standard makefile: %s", + default_makefiles[i]); + + return fd; +} + + +void +cmdline_opt_f(const char *arg, const char **makefile_pathp) +{ + static int warning_emitted = 0; + + if (*makefile_pathp && !warning_emitted) { + warning_emitted = 1; + warnf_unspecified(WC_CMDLINE, "the -f option has been specified multiple times, " + "they are processed in order, but the behaviour is " + "otherwise unspecified"); + printinfof(WC_CMDLINE, "this implementation will use the last " + "option and discard earlier options"); + } + + *makefile_pathp = arg; +} + + +struct line * +load_makefile(const char *path, size_t *nlinesp) +{ + struct line *lines; + int fd; + + if (!path) { + fd = open_default_makefile(&path); + } else if (!strcmp(path, "-")) { + /* “A pathname of '-' shall denote the standard input” */ + fd = dup(STDIN_FILENO); + if (fd < 0) + eprintf("dup <stdin>:"); + path = "<stdin>"; + } else { + fd = open(path, O_RDONLY); + if (fd < 0) + eprintf("open %s O_RDONLY:", path); + } + + lines = load_text_file(fd, path, 0, nlinesp); + close(fd); + return lines; +} |