feat(rc): working prototype of input->compile->print loop

1 files changed, 65 insertions, 0 deletions

diff --git a/sys/cmd/rc/util.c b/sys/cmd/rc/util.c
new file mode 100644
index 0000000..b0be788
--- /dev/null
+++ b/sys/cmd/rc/util.c
@@ -0,0 +1,65 @@
+#include "rc.h"
+
+void
+fatal(char *msg, ...)
+{
+    va_list args;
+    vfprintf(stderr, msg, args);
+    va_end(args);
+
+    abort();
+}
+
+void*
+emalloc(uintptr n)
+{
+    void *p;
+    if(!(p = malloc(n)))
+        fatal("out of memory: can't allocate %d bytes", n);
+
+    memset(p, 0, n);
+    return p;
+}
+
+void*
+erealloc(void *p, uintptr n)
+{
+    void *r;
+    if(!(r = realloc(p,n)))
+        fatal("out of memory: can't reallocate %d bytes", n);
+
+    return r;
+}
+
+void
+efree(void *p)
+{
+    if(p)
+        free(p);
+    // TODO: log the double free
+}
+
+
+char *bp;
+
+static
+void
+iacvt(int n)
+{
+    if(n<0){
+        *bp++='-';
+        n=-n;	/* doesn't work for n==-inf */
+    }
+    if(n/10)
+        iacvt(n/10);
+
+    *bp++=n%10+'0';
+}
+
+void
+itoa(char *s, long n)
+{
+    bp = s;
+    iacvt(n);
+    *bp='\0';
+}