Add arg parsing.

1 files changed, 21 insertions, 0 deletions

diff --git a/minias.h b/minias.h
index c16caf0..de6f2c8 100644
--- a/minias.h
+++ b/minias.h
@@ -342,6 +342,27 @@ AsmLine *parse(void);
 
 /* util.c */
 
+#define ARGBEGIN                                                               \
+  for (;;) {                                                                   \
+    if (argc > 0)                                                              \
+      ++argv, --argc;                                                          \
+    if (argc == 0 || (*argv)[0] != '-')                                        \
+      break;                                                                   \
+    if ((*argv)[1] == '-' && !(*argv)[2]) {                                    \
+      ++argv, --argc;                                                          \
+      break;                                                                   \
+    }                                                                          \
+    for (char *opt_ = &(*argv)[1], done_ = 0; !done_ && *opt_; ++opt_) {       \
+      switch (*opt_)
+
+#define ARGEND                                                                 \
+  }                                                                            \
+  }
+
+#define EARGF(x)                                                               \
+  (done_ = 1, opt_[1] ? ++opt_ : argv[1] ? --argc,                             \
+   *++argv : ((x), abort(), (char *)0))
+
 void vwarn(const char *fmt, va_list ap);
 void fatal(const char *fmt, ...);
 void unreachable(void);