small polish, samples

git-svn-id: svn://kolibrios.org@6443 a494cfbc-eb01-0410-851d-a64ba20cac60

programs/develop/ktcc/trunk/libc/stdio/scanf.c

@@ -47,7 +47,7 @@ int vscanf ( const char * format, va_list arg )
     return format_scan(NULL, format, arg, &virtual_getc_con, &virtual_ungetc_con);
 };
 
-int kos_scanf ( const char * format, ...)
+int scanf ( const char * format, ...)
 {
    va_list      arg;
    int  n;

programs/develop/ktcc/trunk/libc/stdio/sprintf_tiny.c

@@ -0,0 +1,97 @@
+/*
+        function for format output to the string. much lighter than standard sprintf
+        because of lesser formats supported
+*/
+
+
+#include <string.h>
+//#include <stdio.h>
+#include <ctype.h>
+#include <stdarg.h>
+
+char* __itoa(int n,char* s);
+char* itoab(unsigned int n, char* s, int  b);
+
+int tiny_vsnprintf (char * s, size_t n, const char * format, va_list args )
+// support %c, %s, %d, %x, %u, %% for 32-bit values only. no width specs, left align
+// always zero-ended
+{
+    char *fmt, *dest, buf[32];
+    fmt = (char*)format;
+    dest = s; dest[n - 1] = '\0';
+    int     arg, len;
+    while (*fmt && (dest - s < n - 1))
+    {
+        if (*fmt != '%')
+        {
+            *dest++ = *fmt++;
+            continue;
+        }
+        if (fmt[1] == '%') // %%
+        {
+            *dest++ = '%';
+            fmt += 2;
+            continue;
+        }
+        arg = va_arg(args, int);
+        len = n - 1 - (dest - s);
+        switch (*++fmt)
+        {
+        case 'c':
+            *dest++ = (char)arg;
+            break;
+        case 's':
+            strncpy(dest, (char*)arg, len);
+            dest = strchr(dest, 0);
+            break;
+        case 'd':
+            __itoa(arg, buf);
+            strncpy(dest, buf, len);
+            dest = strchr(dest, 0);
+            break;
+        case 'x':
+            itoab((unsigned)arg, buf, 16);
+            strncpy(dest, buf, len);
+            dest = strchr(dest, 0);
+            break;
+        case 'u':
+            itoab((unsigned)arg, buf, 10);
+            strncpy(dest, buf, len);
+            dest = strchr(dest, 0);
+            break;
+        default:
+            *dest++ = *fmt;
+        }
+        fmt++;
+    }
+    *dest = '\0';
+    return dest - s;
+}
+
+
+int tiny_snprintf (char * s, size_t n, const char * format, ... )
+{
+   va_list      arg;
+   int  rc;
+   va_start(arg, format);
+
+   rc = tiny_vsnprintf(s, n, format, arg);
+
+   va_end(arg);
+   return rc;
+}
+
+int tiny_sprintf (char * s, const char * format, ... )
+{
+   va_list      arg;
+   int  rc;
+   va_start(arg, format);
+
+   rc = tiny_vsnprintf(s, 4096, format, arg);
+
+   va_end(arg);
+   return rc;
+}
+
+
+