2 files changed, 266 insertions, 0 deletions
diff --git a/rushs/evalexpr/tinyprintf/src/tinyprintf.c b/rushs/evalexpr/tinyprintf/src/tinyprintf.c
new file mode 100644
index 0000000..d005db7
--- /dev/null
+++ b/rushs/evalexpr/tinyprintf/src/tinyprintf.c
@@ -0,0 +1,251 @@
+#include "tinyprintf.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int tinyprintf(const char *format, ...)
+{
+    if (format == NULL || *format == '\0')
+    {
+        return 0;
+    }
+
+    va_list ap;
+    va_start(ap, format);
+    int res = 0;
+
+    size_t i = 0;
+    while (format[i])
+    {
+        if (format[i] != '%')
+        {
+            putchar(format[i]);
+            res++;
+        }
+        else
+        {
+            dispatch(format[i + 1], ap, &res);
+            format++;
+        }
+        format++;
+    }
+    va_end(ap);
+    return res;
+}
+
+void dispatch(char c, va_list ap, int *res)
+{
+    switch (c)
+    {
+    case '%':
+        putchar('%');
+        (*res)++;
+        break;
+    case 'd':
+        handle_d(va_arg(ap, int), res);
+        break;
+    case 'u':
+        handle_u(va_arg(ap, unsigned int), res);
+        break;
+    case 'x':
+        handle_x(va_arg(ap, unsigned int), res);
+        break;
+    case 'o':
+        handle_o(va_arg(ap, unsigned int), res);
+        break;
+    case 'c':
+        putchar(va_arg(ap, int));
+        (*res)++;
+        break;
+    case 's':
+        handle_s(va_arg(ap, char *), res);
+        break;
+    default:
+        putchar('%');
+        putchar(c);
+        *res += 2;
+        break;
+    }
+}
+
+void handle_d(int val, int *res)
+{
+    if (val < 0)
+    {
+        putchar('-');
+        (*res)++;
+        val = -val;
+    }
+
+    if (val == 0)
+    {
+        putchar('0');
+        (*res)++;
+    }
+
+    int t = val;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 10;
+        n++;
+    }
+
+    char *s = malloc(n * sizeof(char));
+    int m = n;
+    if (s == NULL)
+    {
+        return;
+    }
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = val % 10 + '0';
+        val /= 10;
+    }
+
+    // actual printing
+    for (int i = 0; i < m; i++)
+    {
+        putchar(s[i]);
+        (*res)++;
+    }
+    free(s);
+}
+
+void handle_s(char *s, int *res)
+{
+    if (s == NULL)
+    {
+        char *text = "(null)";
+        for (; *text; text++)
+        {
+            putchar(*text);
+            (*res)++;
+        }
+        return;
+    }
+    for (; *s; s++)
+    {
+        putchar(*s);
+        (*res)++;
+    }
+}
+
+void handle_u(unsigned int val, int *res)
+{
+    if (val == 0)
+    {
+        putchar('0');
+        (*res)++;
+    }
+
+    unsigned int t = val;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 10;
+        n++;
+    }
+
+    char *s = malloc(n * sizeof(char));
+    int m = n;
+    if (s == NULL)
+    {
+        return;
+    }
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = val % 10 + '0';
+        val /= 10;
+    }
+
+    // actual printing
+    for (int i = 0; i < m; i++)
+    {
+        putchar(s[i]);
+        (*res)++;
+    }
+    free(s);
+}
+
+void handle_x(unsigned int val, int *res)
+{
+    if (val == 0)
+    {
+        putchar('0');
+        (*res)++;
+    }
+
+    unsigned int t = val;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 16;
+        n++;
+    }
+
+    char *s = malloc(n * sizeof(char));
+    int m = n;
+    if (s == NULL)
+    {
+        return;
+    }
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = val % 16 + '0';
+        if (s[n] > '9')
+        {
+            s[n] = (s[n] - '0') % 10 + 'a';
+        }
+        val /= 16;
+    }
+
+    // actual printing
+    for (int i = 0; i < m; i++)
+    {
+        putchar(s[i]);
+        (*res)++;
+    }
+    free(s);
+}
+
+void handle_o(unsigned int val, int *res)
+{
+    if (val == 0)
+    {
+        putchar('0');
+        (*res)++;
+    }
+
+    unsigned int t = val;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 8;
+        n++;
+    }
+
+    char *s = malloc(n * sizeof(char));
+    int m = n;
+    if (s == NULL)
+    {
+        return;
+    }
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = val % 8 + '0';
+        val /= 8;
+    }
+
+    // actual printing
+    for (int i = 0; i < m; i++)
+    {
+        putchar(s[i]);
+        (*res)++;
+    }
+    free(s);
+}
diff --git a/rushs/evalexpr/tinyprintf/src/tinyprintf.h b/rushs/evalexpr/tinyprintf/src/tinyprintf.h
new file mode 100644
index 0000000..fd1f0b4
--- /dev/null
+++ b/rushs/evalexpr/tinyprintf/src/tinyprintf.h
@@ -0,0 +1,15 @@
+#ifndef TINYPRINTF_H
+#define TINYPRINTF_H
+
+#include <stdarg.h>
+#include <stddef.h>
+
+int tinyprintf(const char *format, ...);
+void handle_d(int val, int *res);
+void handle_u(unsigned int val, int *res);
+void handle_x(unsigned int val, int *res);
+void handle_o(unsigned int val, int *res);
+void handle_s(char *s, int *res);
+void dispatch(char c, va_list ap, int *res);
+
+#endif /* ! TINYPRINTF_H */