serial experiment works

[rpikern] / src / libc / ctype.c

diff --git a/src/libc/ctype.c b/src/libc/ctype.c
new file mode 100644 (file)
index 0000000..9676441
--- /dev/null
+++ b/src/libc/ctype.c
@@ -0,0 +1,56 @@
+#include "ctype.h"
+
+int isalnum(int c)
+{
+       return isalpha(c) || isdigit(c);
+}
+
+int isalpha(int c)
+{
+       return isupper(c) || islower(c);
+}
+
+int isblank(int c)
+{
+       return c == ' ' || c == '\t';
+}
+
+int isdigit(int c)
+{
+       return c >= '0' && c <= '9';
+}
+
+int isupper(int c)
+{
+       return c >= 'A' && c <= 'Z';
+}
+
+int islower(int c)
+{
+       return c >= 'a' && c <= 'z';
+}
+
+int isgraph(int c)
+{
+       return c > ' ' && c <= '~';
+}
+
+int isprint(int c)
+{
+       return isgraph(c) || c == ' ';
+}
+
+int isspace(int c)
+{
+       return isblank(c) || c == '\f' || c == '\n' || c == '\r' || c == '\v';
+}
+
+int toupper(int c)
+{
+       return islower(c) ? (c + ('A' - 'a')) : c;
+}
+
+int tolower(int c)
+{
+       return isupper(c) ? (c + ('A' - 'a')) : c;
+}