Revert "Revert "Initial commit - work done up through 11 Feb 2020""

This reverts commit 56f77cf071.

oops

stdio/printf.c

@@ -0,0 +1,107 @@
+#include <limits.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+static bool print(const char * str, size_t len) {
+  const unsigned char * bytes = (const unsigned char *) str;
+
+  for(size_t i = 0; i < len; i++) {
+    if(putchar(bytes[i]) == EOF) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+int printf(const char * restrict format, ...) {
+  va_list parameters;
+  va_start(parameters, format);
+
+  int written = 0;
+
+  while(*format != '\0') {
+    size_t maxrem = INT_MAX - written;
+
+    if(format[0] != '%' || format[1] == '%') {
+      if(format[0] == '%') {
+	format++;
+      }
+
+      size_t amount = 1;
+
+      while(format[amount] && format[amount] != '%') {
+	amount++;
+      }
+
+      if(maxrem < amount) {
+	/* TODO: Set errno to EOVERFLOW after implementing errno.h */
+	return -1;
+      }
+
+      if(!print(format, amount)) {
+	return -1;
+      }
+
+      format += amount;
+      written += amount;
+      continue;
+    }
+
+    const char * format_begun_at = format++;
+
+    /* TODO: Implement all format specifiers (%g, %o, &c.) */
+    if(*format == 'c') {
+      format++;
+      char c = (char) va_arg(parameters, int);
+
+      if(!maxrem) {
+	/* TODO: Set errno to EOVERFLOW after implementing errno.h */
+	return -1;
+      }
+
+      if(!print(&c, sizeof(c))) {
+	return -1;
+      }
+
+      written++;
+    }
+    else if(*format == 's') {
+      format++;
+      const char * str = va_arg(parameters, const char *);
+      size_t len = strlen(str);
+
+      if(maxrem < len) {
+	/* TODO: Set errno to EOVERFLOW after implementing errno.h */
+	return -1;
+      }
+
+      if(!print(str, len)) {
+	return -1;
+      }
+
+      written += len;
+    }
+    else {
+      format = format_begun_at;
+      size_t len = strlen(format);
+
+      if(maxrem < len) {
+	/* TODO: Set errno to EOVERFLOW after implementing errno.h */
+	return -1;
+      }
+
+      if(!print(format, len)) {
+	return -1;
+      }
+
+      format += len;
+    } 
+  }
+
+  va_end(parameters);
+
+  return(written);
+}

stdio/printf.libk.d

@@ -0,0 +1,6 @@
+stdio/printf.libk.o: stdio/printf.c \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include-fixed/limits.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stdbool.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stdarg.h \
+ include/stdio.h include/sys/cdefs.h include/string.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stddef.h

stdio/putchar.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+#ifdef __is_libk
+#include <kernel/tty.h>
+#endif
+
+int putchar(int ic) {
+#ifdef __is_libk
+  char c = (char) ic;
+  term_write(&c, sizeof(c));
+#else
+  /* TODO: Implement write system call to do this part */
+#endif
+
+  return ic;
+}

stdio/putchar.libk.d

@@ -0,0 +1,3 @@
+stdio/putchar.libk.o: stdio/putchar.c include/stdio.h include/sys/cdefs.h \
+ /home/helmsulfrinn/Documents/projects/coding/active/fenix/sysroot/usr/include/kernel/tty.h \
+ /usr/home/helmsulfrinn/opt/cross/lib/gcc/i686-elf/9.2.0/include/stddef.h

stdio/puts.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+int puts(const char * string) {
+  return printf("%s\n", string);
+}

stdio/puts.libk.d

@@ -0,0 +1 @@
+stdio/puts.libk.o: stdio/puts.c include/stdio.h include/sys/cdefs.h