started the implementation

[visor] / libvisor / src / vilibc.h

diff --git a/libvisor/src/vilibc.h b/libvisor/src/vilibc.h
new file mode 100644 (file)
index 0000000..881c6ed
--- /dev/null
+++ b/libvisor/src/vilibc.h
@@ -0,0 +1,41 @@
+#ifndef VISOR_LIBC_H_
+#define VISOR_LIBC_H_
+
+/* XXX let's pretend we don't have a libc to test our own code
+#ifdef __STDC_HOSTED__
+#define HAVE_LIBC
+#endif
+*/
+
+#ifdef HAVE_LIBC
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#else
+
+void *memset(void *s, int c, unsigned long n);
+void *memcpy(void *dest, const void *src, unsigned long n);
+void *memmove(void *dest, const void *src, unsigned long n);
+unsigned long strlen(const char *s);
+int strcmp(const char *s1, const char *s2);
+
+#ifdef __GNUC__
+typedef __builtin_va_list va_list;
+#define va_start(v,l)  __builtin_va_start(v,l)
+#define va_end(v)      __builtin_va_end(v)
+#define va_arg(v,l)    __builtin_va_arg(v,l)
+#else  /* !def __GNUC__ */
+#error "stdargs implementation for this compiler missing (libvisor/src/vilibc.h)"
+#endif
+
+int sprintf(char *buf, const char *fmt, ...);
+int vsprintf(char *buf, const char *fmt, va_list ap);
+int snprintf(char *buf, unsigned long sz, const char *fmt, ...);
+int vsnprintf(char *buf, unsigned long sz, const char *fmt, va_list ap);
+
+#endif /* !HAVE_LIBC */
+
+struct visor;
+void vi_error(struct visor *vi, const char *fmt, ...);
+
+#endif /* VISOR_LIBC_H_ */