Exerc 7_3.

chapter_7.input_output/7_3.minprintf/Makefile

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+BINARY=minprintf
+
+include ../../Exercise_incl.mk

chapter_7.input_output/7_3.minprintf/main.c

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+# include "minprintf.h"
+
+int main ()
+{
+  minprintf("int -100: %d\nuint 222: %u\nhex 1A: %x\ndouble -5.003: %f\nchar 'X': %c\n"
+            "str \"KnR Solutions\": %s\n",
+            (int) -100, (unsigned int) 222, (int) 26, (double) -5.003, (char) 'X',
+            "KnR Solutions");
+  return 0;
+}

chapter_7.input_output/7_3.minprintf/minprintf.c

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+# include <stdio.h>
+# include <stdarg.h>
+
+/* minprintf: minimal printf with variable argument list */
+void minprintf (char *fmt, ...)
+{
+  va_list ap; /* points to each unnamed arg in turn */
+  char *p, *sval;
+
+  va_start(ap, fmt); /* make ap point to 1st unnamed arg */
+  for (p = fmt; *p; p++) {
+    if (*p != '%') {
+      putchar(*p);
+      continue;
+    }
+    switch (*++p) {
+    case 'i':
+    case 'd': printf("%d", va_arg(ap, int)); break;
+    case 'u': printf("%u", va_arg(ap, unsigned int)); break;
+    case 'x': printf("%x", va_arg(ap, int)); break;
+    case 'f': printf("%f", va_arg(ap, double)); break;
+    case 'c': printf("%c", va_arg(ap, int)); break;
+    case 's':
+      for (sval = va_arg(ap, char *); *sval; sval++)
+        putchar(*sval);
+      break;
+    default: putchar(*p); break;
+    }
+  }
+  va_end(ap); /* clean up when done */
+}

chapter_7.input_output/7_3.minprintf/minprintf.h

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+# ifndef MINPRINTF_H
+# define MINPRINTF_H
+
+/* minprintf: minimal printf with variable argument list */
+void minprintf (char *fmt, ...);
+
+# endif

chapter_7.input_output/7_3.minprintf/tests/0_internal.tout

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+int -100: -100
+uint 222: 222
+hex 1A: 1a
+double -5.003: -5.003000
+char 'X': X
+str "KnR Solutions": KnR Solutions