o Adding missing tinyprintf

8 files changed, 1427 insertions, 0 deletions

diff --git a/tinyprintf/LICENSE.BSD-new b/tinyprintf/LICENSE.BSD-new
new file mode 100644
index 0000000..c088c77
--- /dev/null
+++ b/tinyprintf/LICENSE.BSD-new
@@ -0,0 +1,24 @@
+Copyright (c) 2004,2012 Kustaa Nyholm / SpareTimeLabs
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
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+      documentation and/or other materials provided with the distribution.
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diff --git a/tinyprintf/LICENSE.LGPL-2.1 b/tinyprintf/LICENSE.LGPL-2.1
new file mode 100644
index 0000000..4362b49
--- /dev/null
+++ b/tinyprintf/LICENSE.LGPL-2.1
@@ -0,0 +1,502 @@
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diff --git a/tinyprintf/Makefile b/tinyprintf/Makefile
new file mode 100644
index 0000000..43adc13
--- /dev/null
+++ b/tinyprintf/Makefile
@@ -0,0 +1,39 @@
+
+CPPFLAGS+=-I.
+CFLAGS+=-Wall -W -Wextra -O3 -g
+# RUNNER:=valgrind
+
+.PHONY: all test tests compiletests runtests clean
+
+all: tests
+
+test tests: compiletests runtests
+
+runtests: test/printf test/sprintf
+	set -x ; for prg in $^ ; do $(RUNNER) $$prg || exit $$? ; done
+
+compiletests:
+	$(COMPILE.c) \
+	  -DTINYPRINTF_DEFINE_TFP_PRINTF=0 \
+	  -DTINYPRINTF_DEFINE_TFP_SPRINTF=0 \
+	  -DTINYPRINTF_OVERRIDE_LIBC=0 \
+	  -o tinyprintf_minimal.o tinyprintf.c
+	$(COMPILE.c) \
+	  -DTINYPRINTF_DEFINE_TFP_PRINTF=1 \
+	  -DTINYPRINTF_DEFINE_TFP_SPRINTF=0 \
+	  -DTINYPRINTF_OVERRIDE_LIBC=0 \
+	  -o tinyprintf_only_tfp_printf.o tinyprintf.c
+	$(COMPILE.c) \
+	  -DTINYPRINTF_DEFINE_TFP_PRINTF=0 \
+	  -DTINYPRINTF_DEFINE_TFP_SPRINTF=1 \
+	  -DTINYPRINTF_OVERRIDE_LIBC=0 \
+	  -o tinyprintf_only_tfp_sprintf.o tinyprintf.c
+
+test/printf: test/printf.o tinyprintf.o
+	$(LINK.c) -o $@ $^
+
+test/sprintf: test/sprintf.o tinyprintf.o
+	$(LINK.c) -o $@ $^
+
+clean:
+	$(RM) *.o test/*.o *~ test/*~ test/printf test/sprintf
diff --git a/tinyprintf/README b/tinyprintf/README
new file mode 100644
index 0000000..64f27e5
--- /dev/null
+++ b/tinyprintf/README
@@ -0,0 +1,6 @@
+tinyprintf originally from http://www.sparetimelabs.com/tinyprintf/index.html
+Copyright (C) 2004,2012  Kustaa Nyholm
+Licenses: LGPL 2.1 or later (see LICENSE.LGPL-2.1)
+      or  BSD-new           (see LICENSE.BSD-new)
+
+"You are free to use the LGPL license [...] or the BSD license"
diff --git a/tinyprintf/test/printf.c b/tinyprintf/test/printf.c
new file mode 100644
index 0000000..dd84a9b
--- /dev/null
+++ b/tinyprintf/test/printf.c
@@ -0,0 +1,69 @@
+
+#define TINYPRINTF_DEFINE_TFP_PRINTF 1
+#define TINYPRINTF_DEFINE_TFP_SPRINTF 0
+#define TINYPRINTF_OVERRIDE_LIBC 0
+
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+
+#include "tinyprintf.h"
+
+/* Clear unused warnings for actually unused variables */
+#define UNUSED(x) (void)(x)
+
+#define TPRINTF(expr...) \
+  ({ printf("libc_printf(%s) -> ", #expr); printf(expr); \
+     printf(" tfp_printf(%s) -> ", #expr); tfp_printf(expr); })
+
+static void stdout_putf(void *unused, char c)
+{
+  UNUSED(unused);
+  putchar(c);
+}
+
+int main()
+{
+  init_printf(NULL, stdout_putf);
+
+  printf("Fun with printf and %%!\n");
+
+  TPRINTF("d1=%016llx d2=%016lx d3=%02x d4=%02X 42=%03d\n",
+          (long long unsigned)0xd1, (long unsigned)0xd2, 0xd3, 0xd4, 42);
+  TPRINTF("d1=%04x d2=%06x d3=%08x %%100\n", 0xd1, 0xd2, 0xd3);
+  TPRINTF("|%-14s| |%-16s| d2=%2x |%-30s|\n", "str14", "str16", 0xd2,
+          "12345678901234567890123456789012345");
+  TPRINTF("|%4s|\n", "string4");
+  TPRINTF("|%-4s|\n", "string4");
+  TPRINTF("42=%3d d1=%4.4x |%4s| d2=%8.8x\n", 42, 0xd1, "string4", 0xd2);
+  TPRINTF("42=%3d d1=%4.4x |%-4s| d2=%8.8x\n", 42, 0xd1, "string4", 0xd2);
+  TPRINTF("84=%d 21=%ds |%s| |%sOK| d1=%x d2=%#x\n",
+          84, 21, "hello", "fine", 0xd1, 0xd2);
+
+  TPRINTF("%lld\n", LLONG_MIN);
+  TPRINTF("%lld\n", LLONG_MAX);
+  TPRINTF("%llu\n", ULLONG_MAX);
+  TPRINTF("%llx\n", LLONG_MIN);
+  TPRINTF("%llx\n", LLONG_MAX);
+  TPRINTF("%llx\n", ULLONG_MAX);
+
+  TPRINTF("d1=%.1x\n", 0xd1);
+  TPRINTF("d1=%4.1x\n", 0xd1);
+  TPRINTF("d1=%4.x\n", 0xd1);
+
+  {
+    char blah[256];
+    TPRINTF("a=%zd\n", sizeof(blah));
+    TPRINTF("a=%zu\n", sizeof(blah));
+    TPRINTF("a=%zi\n", sizeof(blah));
+    TPRINTF("a=0x%zx\n", sizeof(blah));
+  }
+
+  {
+    int in_stack;
+    TPRINTF("Adddress of main: %p\n", main);
+    TPRINTF("Adddress of stack variable: %p\n", &in_stack);
+  }
+
+  return 0;
+}
diff --git a/tinyprintf/test/sprintf.c b/tinyprintf/test/sprintf.c
new file mode 100644
index 0000000..06a01ed
--- /dev/null
+++ b/tinyprintf/test/sprintf.c
@@ -0,0 +1,80 @@
+
+#define TINYPRINTF_DEFINE_TFP_PRINTF 0
+#define TINYPRINTF_DEFINE_TFP_SPRINTF 1
+#define TINYPRINTF_OVERRIDE_LIBC 0
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <limits.h>
+
+#include "tinyprintf.h"
+
+/* Use malloc so that valgrind can catch array overflows */
+#define TPRINTF(expr...)                                                \
+  ({ char *s1, *s2; size_t sz1, sz2;                                    \
+    /* Test format ok */                                                \
+    s1 = malloc(1024); s2 = malloc(1024);                               \
+    sz1 = snprintf(s1, 1024, expr); sz2 = tfp_snprintf(s2, 256, expr);  \
+    printf("libc_snprintf(%s) -> %d: ", #expr, (int)sz1); puts(s1);     \
+    printf(" tfp_snprintf(%s) -> %d: ", #expr, (int)sz2); puts(s2);     \
+    assert(sz1 == sz2);                                                 \
+    assert(0 == strcmp(s1, s2));                                        \
+    /* Test no array verflow */                                         \
+    free(s1); free(s2); s1 = malloc(1); s2 = malloc(1);                 \
+    assert(snprintf(s1, 1, expr) == tfp_snprintf(s2, 1, expr));         \
+    assert(strlen(s1) == 0); assert(strlen(s2) == 0);                   \
+    assert(0 == strcmp(s1, s2));                                        \
+    /* Test correct truncation */                                       \
+    free(s1); free(s2); s1 = malloc(16); s2 = malloc(16);               \
+    assert(snprintf(s1, 16, expr) == tfp_snprintf(s2, 16, expr));       \
+    assert(strlen(s1) < 16); assert(strlen(s2) < 16);                   \
+    assert(0 == strcmp(s1, s2));                                        \
+    free(s1); free(s2);                                                 \
+  })
+
+
+int main()
+{
+  printf("Fun with sprintf and %%!\n");
+
+  TPRINTF("d1=%016llx d2=%016lx d3=%02x d4=%02X 42=%03d",
+          (long long unsigned)0xd1, (long unsigned)0xd2, 0xd3, 0xd4, 42);
+  TPRINTF("d1=%04x d2=%06x d3=%08x %%100", 0xd1, 0xd2, 0xd3);
+  TPRINTF("|%-14s| |%-16s| d2=%2x |%-30s|", "str14", "str16", 0xd2,
+          "12345678901234567890123456789012345");
+  TPRINTF("|%4s|", "string4");
+  TPRINTF("|%-4s|", "string4");
+  TPRINTF("42=%3d d1=%4.4x |%4s| d2=%8.8x", 42, 0xd1, "string4", 0xd2);
+  TPRINTF("42=%3d d1=%4.4x |%-4s| d2=%8.8x", 42, 0xd1, "string4", 0xd2);
+  TPRINTF("84=%d 21=%ds |%s| |%sOK| d1=%x d2=%#x",
+          84, 21, "hello", "fine", 0xd1, 0xd2);
+
+  TPRINTF("%lld", LLONG_MIN);
+  TPRINTF("%lld", LLONG_MAX);
+  TPRINTF("%llu", ULLONG_MAX);
+  TPRINTF("%llx", LLONG_MIN);
+  TPRINTF("%llx", LLONG_MAX);
+  TPRINTF("%llx", ULLONG_MAX);
+
+  TPRINTF("d1=%4.4x", 0xd1);
+
+  {
+    char blah[256];
+    TPRINTF("a=%zd", sizeof(blah));
+    TPRINTF("a=%zu", sizeof(blah));
+    TPRINTF("a=%zi", sizeof(blah));
+    TPRINTF("a=0x%zx", sizeof(blah));
+  }
+
+  TPRINTF("Hello |%15s|.", "12345678901234");
+
+  {
+    int in_stack;
+    TPRINTF("Adddress of main: %p", main);
+    TPRINTF("Adddress of stack variable: %p", &in_stack);
+  }
+
+  return 0;
+}
diff --git a/tinyprintf/tinyprintf.c b/tinyprintf/tinyprintf.c
new file mode 100644
index 0000000..42d05b0
--- /dev/null
+++ b/tinyprintf/tinyprintf.c
@@ -0,0 +1,521 @@
+/*
+File: tinyprintf.c
+
+Copyright (C) 2004  Kustaa Nyholm
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+*/
+
+#include "tinyprintf.h"
+
+
+/*
+ * Configuration
+ */
+
+/* Enable long int support */
+#define PRINTF_LONG_SUPPORT
+
+/* Enable long long int support (implies long int support) */
+//#define PRINTF_LONG_LONG_SUPPORT
+
+/* Enable %z (size_t) support */
+#define PRINTF_SIZE_T_SUPPORT
+
+/*
+ * Configuration adjustments
+ */
+#ifdef PRINTF_SIZE_T_SUPPORT
+#include <sys/types.h>
+#endif
+
+#ifdef PRINTF_LONG_LONG_SUPPORT
+# define PRINTF_LONG_SUPPORT
+#endif
+
+/* __SIZEOF_<type>__ defined at least by gcc */
+#ifdef __SIZEOF_POINTER__
+# define SIZEOF_POINTER __SIZEOF_POINTER__
+#endif
+#ifdef __SIZEOF_LONG_LONG__
+# define SIZEOF_LONG_LONG __SIZEOF_LONG_LONG__
+#endif
+#ifdef __SIZEOF_LONG__
+# define SIZEOF_LONG __SIZEOF_LONG__
+#endif
+#ifdef __SIZEOF_INT__
+# define SIZEOF_INT __SIZEOF_INT__
+#endif
+
+#ifdef __GNUC__
+# define _TFP_GCC_NO_INLINE_  __attribute__ ((noinline))
+#else
+# define _TFP_GCC_NO_INLINE_
+#endif
+
+/*
+ * Implementation
+ */
+struct param {
+    char lz:1;          /**<  Leading zeros */
+    char alt:1;         /**<  alternate form */
+    char uc:1;          /**<  Upper case (for base16 only) */
+    char align_left:1;  /**<  0 == align right (default), 1 == align left */
+    unsigned int width; /**<  field width */
+    char sign;          /**<  The sign to display (if any) */
+    unsigned int base;  /**<  number base (e.g.: 8, 10, 16) */
+    char *bf;           /**<  Buffer to output */
+};
+
+
+#ifdef PRINTF_LONG_LONG_SUPPORT
+static void _TFP_GCC_NO_INLINE_ ulli2a(
+    unsigned long long int num, struct param *p)
+{
+    int n = 0;
+    unsigned long long int d = 1;
+    char *bf = p->bf;
+    while (num / d >= p->base)
+        d *= p->base;
+    while (d != 0) {
+        int dgt = num / d;
+        num %= d;
+        d /= p->base;
+        if (n || dgt > 0 || d == 0) {
+            *bf++ = dgt + (dgt < 10 ? '0' : (p->uc ? 'A' : 'a') - 10);
+            ++n;
+        }
+    }
+    *bf = 0;
+}
+
+static void lli2a(long long int num, struct param *p)
+{
+    if (num < 0) {
+        num = -num;
+        p->sign = '-';
+    }
+    ulli2a(num, p);
+}
+#endif
+
+#ifdef PRINTF_LONG_SUPPORT
+static void uli2a(unsigned long int num, struct param *p)
+{
+    int n = 0;
+    unsigned long int d = 1;
+    char *bf = p->bf;
+    while (num / d >= p->base)
+        d *= p->base;
+    while (d != 0) {
+        int dgt = num / d;
+        num %= d;
+        d /= p->base;
+        if (n || dgt > 0 || d == 0) {
+            *bf++ = dgt + (dgt < 10 ? '0' : (p->uc ? 'A' : 'a') - 10);
+            ++n;
+        }
+    }
+    *bf = 0;
+}
+
+static void li2a(long num, struct param *p)
+{
+    if (num < 0) {
+        num = -num;
+        p->sign = '-';
+    }
+    uli2a(num, p);
+}
+#endif
+
+static void ui2a(unsigned int num, struct param *p)
+{
+    int n = 0;
+    unsigned int d = 1;
+    char *bf = p->bf;
+    while (num / d >= p->base)
+        d *= p->base;
+    while (d != 0) {
+        int dgt = num / d;
+        num %= d;
+        d /= p->base;
+        if (n || dgt > 0 || d == 0) {
+            *bf++ = dgt + (dgt < 10 ? '0' : (p->uc ? 'A' : 'a') - 10);
+            ++n;
+        }
+    }
+    *bf = 0;
+}
+
+static void i2a(int num, struct param *p)
+{
+    if (num < 0) {
+        num = -num;
+        p->sign = '-';
+    }
+    ui2a(num, p);
+}
+
+static int a2d(char ch)
+{
+    if (ch >= '0' && ch <= '9')
+        return ch - '0';
+    else if (ch >= 'a' && ch <= 'f')
+        return ch - 'a' + 10;
+    else if (ch >= 'A' && ch <= 'F')
+        return ch - 'A' + 10;
+    else
+        return -1;
+}
+
+static char a2u(char ch, const char **src, int base, unsigned int *nump)
+{
+    const char *p = *src;
+    unsigned int num = 0;
+    int digit;
+    while ((digit = a2d(ch)) >= 0) {
+        if (digit > base)
+            break;
+        num = num * base + digit;
+        ch = *p++;
+    }
+    *src = p;
+    *nump = num;
+    return ch;
+}
+
+static void putchw(void *putp, putcf putf, struct param *p)
+{
+    char ch;
+    int n = p->width;
+    char *bf = p->bf;
+
+    /* Number of filling characters */
+    while (*bf++ && n > 0)
+        n--;
+    if (p->sign)
+        n--;
+    if (p->alt && p->base == 16)
+        n -= 2;
+    else if (p->alt && p->base == 8)
+        n--;
+
+    /* Fill with space to align to the right, before alternate or sign */
+    if (!p->lz && !p->align_left) {
+        while (n-- > 0)
+            putf(putp, ' ');
+    }
+
+    /* print sign */
+    if (p->sign)
+        putf(putp, p->sign);
+
+    /* Alternate */
+    if (p->alt && p->base == 16) {
+        putf(putp, '0');
+        putf(putp, (p->uc ? 'X' : 'x'));
+    } else if (p->alt && p->base == 8) {
+        putf(putp, '0');
+    }
+
+    /* Fill with zeros, after alternate or sign */
+    if (p->lz) {
+        while (n-- > 0)
+            putf(putp, '0');
+    }
+
+    /* Put actual buffer */
+    bf = p->bf;
+    while ((ch = *bf++))
+        putf(putp, ch);
+
+    /* Fill with space to align to the left, after string */
+    if (!p->lz && p->align_left) {
+        while (n-- > 0)
+            putf(putp, ' ');
+    }
+}
+
+void tfp_format(void *putp, putcf putf, const char *fmt, va_list va)
+{
+    struct param p;
+#ifdef PRINTF_LONG_SUPPORT
+    char bf[23];  /* long = 64b on some architectures */
+#else
+    char bf[12];  /* int = 32b on some architectures */
+#endif
+    char ch;
+    p.bf = bf;
+
+    while ((ch = *(fmt++))) {
+        if (ch != '%') {
+            putf(putp, ch);
+        } else {
+#ifdef PRINTF_LONG_SUPPORT
+            char lng = 0;  /* 1 for long, 2 for long long */
+#endif
+            /* Init parameter struct */
+            p.lz = 0;
+            p.alt = 0;
+            p.width = 0;
+            p.align_left = 0;
+            p.sign = 0;
+
+            /* Flags */
+            while ((ch = *(fmt++))) {
+                switch (ch) {
+                case '-':
+                    p.align_left = 1;
+                    continue;
+                case '0':
+                    p.lz = 1;
+                    continue;
+                case '#':
+                    p.alt = 1;
+                    continue;
+                default:
+                    break;
+                }
+                break;
+            }
+
+            /* Width */
+            if (ch >= '0' && ch <= '9') {
+                ch = a2u(ch, &fmt, 10, &(p.width));
+            }
+
+            /* We accept 'x.y' format but don't support it completely:
+             * we ignore the 'y' digit => this ignores 0-fill
+             * size and makes it == width (ie. 'x') */
+            if (ch == '.') {
+              p.lz = 1;  /* zero-padding */
+              /* ignore actual 0-fill size: */
+              do {
+                ch = *(fmt++);
+              } while ((ch >= '0') && (ch <= '9'));
+            }
+
+#ifdef PRINTF_SIZE_T_SUPPORT
+# ifdef PRINTF_LONG_SUPPORT
+            if (ch == 'z') {
+                ch = *(fmt++);
+                if (sizeof(size_t) == sizeof(unsigned long int))
+                    lng = 1;
+#  ifdef PRINTF_LONG_LONG_SUPPORT
+                else if (sizeof(size_t) == sizeof(unsigned long long int))
+                    lng = 2;
+#  endif
+            } else
+# endif
+#endif
+
+#ifdef PRINTF_LONG_SUPPORT
+            if (ch == 'l') {
+                ch = *(fmt++);
+                lng = 1;
+#ifdef PRINTF_LONG_LONG_SUPPORT
+                if (ch == 'l') {
+                  ch = *(fmt++);
+                  lng = 2;
+                }
+#endif
+            }
+#endif
+            switch (ch) {
+            case 0:
+                goto abort;
+            case 'u':
+                p.base = 10;
+#ifdef PRINTF_LONG_SUPPORT
+#ifdef PRINTF_LONG_LONG_SUPPORT
+                if (2 == lng)
+                    ulli2a(va_arg(va, unsigned long long int), &p);
+                else
+#endif
+                  if (1 == lng)
+                    uli2a(va_arg(va, unsigned long int), &p);
+                else
+#endif
+                    ui2a(va_arg(va, unsigned int), &p);
+                putchw(putp, putf, &p);
+                break;
+            case 'd':
+            case 'i':
+                p.base = 10;
+#ifdef PRINTF_LONG_SUPPORT
+#ifdef PRINTF_LONG_LONG_SUPPORT
+                if (2 == lng)
+                    lli2a(va_arg(va, long long int), &p);
+                else
+#endif
+                  if (1 == lng)
+                    li2a(va_arg(va, long int), &p);
+                else
+#endif
+                    i2a(va_arg(va, int), &p);
+                putchw(putp, putf, &p);
+                break;
+#ifdef SIZEOF_POINTER
+            case 'p':
+                p.alt = 1;
+# if defined(SIZEOF_INT) && SIZEOF_POINTER <= SIZEOF_INT
+                lng = 0;
+# elif defined(SIZEOF_LONG) && SIZEOF_POINTER <= SIZEOF_LONG
+                lng = 1;
+# elif defined(SIZEOF_LONG_LONG) && SIZEOF_POINTER <= SIZEOF_LONG_LONG
+                lng = 2;
+# endif
+#endif
+            case 'x':
+            case 'X':
+                p.base = 16;
+                p.uc = (ch == 'X')?1:0;
+#ifdef PRINTF_LONG_SUPPORT
+#ifdef PRINTF_LONG_LONG_SUPPORT
+                if (2 == lng)
+                    ulli2a(va_arg(va, unsigned long long int), &p);
+                else
+#endif
+                  if (1 == lng)
+                    uli2a(va_arg(va, unsigned long int), &p);
+                else
+#endif
+                    ui2a(va_arg(va, unsigned int), &p);
+                putchw(putp, putf, &p);
+                break;
+            case 'o':
+                p.base = 8;
+                ui2a(va_arg(va, unsigned int), &p);
+                putchw(putp, putf, &p);
+                break;
+            case 'c':
+                putf(putp, (char)(va_arg(va, int)));
+                break;
+            case 's':
+                p.bf = va_arg(va, char *);
+                putchw(putp, putf, &p);
+                p.bf = bf;
+                break;
+            case '%':
+                putf(putp, ch);
+            default:
+                break;
+            }
+        }
+    }
+ abort:;
+}
+
+#if TINYPRINTF_DEFINE_TFP_PRINTF
+static putcf stdout_putf;
+static void *stdout_putp;
+
+void init_printf(void *putp, putcf putf)
+{
+    stdout_putf = putf;
+    stdout_putp = putp;
+}
+
+void tfp_printf(const char *fmt, ...)
+{
+    va_list va;
+    va_start(va, fmt);
+    tfp_format(stdout_putp, stdout_putf, fmt, va);
+    va_end(va);
+}
+#endif
+
+#if TINYPRINTF_DEFINE_TFP_SPRINTF
+struct _vsnprintf_putcf_data
+{
+  size_t dest_capacity;
+  char *dest;
+  size_t num_chars;
+};
+
+static void _vsnprintf_putcf(void *p, char c)
+{
+  struct _vsnprintf_putcf_data *data = (struct _vsnprintf_putcf_data*)p;
+  if (data->num_chars < data->dest_capacity)
+    data->dest[data->num_chars] = c;
+  data->num_chars ++;
+}
+
+int tfp_vsnprintf(char *str, size_t size, const char *format, va_list ap)
+{
+  struct _vsnprintf_putcf_data data;
+
+  if (size < 1)
+    return 0;
+
+  data.dest = str;
+  data.dest_capacity = size-1;
+  data.num_chars = 0;
+  tfp_format(&data, _vsnprintf_putcf, format, ap);
+
+  if (data.num_chars < data.dest_capacity)
+    data.dest[data.num_chars] = '\0';
+  else
+    data.dest[data.dest_capacity] = '\0';
+
+  return data.num_chars;
+}
+
+int tfp_snprintf(char *str, size_t size, const char *format, ...)
+{
+  va_list ap;
+  int retval;
+
+  va_start(ap, format);
+  retval = tfp_vsnprintf(str, size, format, ap);
+  va_end(ap);
+  return retval;
+}
+
+struct _vsprintf_putcf_data
+{
+  char *dest;
+  size_t num_chars;
+};
+
+static void _vsprintf_putcf(void *p, char c)
+{
+  struct _vsprintf_putcf_data *data = (struct _vsprintf_putcf_data*)p;
+  data->dest[data->num_chars++] = c;
+}
+
+int tfp_vsprintf(char *str, const char *format, va_list ap)
+{
+  struct _vsprintf_putcf_data data;
+  data.dest = str;
+  data.num_chars = 0;
+  tfp_format(&data, _vsprintf_putcf, format, ap);
+  data.dest[data.num_chars] = '\0';
+  return data.num_chars;
+}
+
+int tfp_sprintf(char *str, const char *format, ...)
+{
+  va_list ap;
+  int retval;
+
+  va_start(ap, format);
+  retval = tfp_vsprintf(str, format, ap);
+  va_end(ap);
+  return retval;
+}
+#endif
diff --git a/tinyprintf/tinyprintf.h b/tinyprintf/tinyprintf.h
new file mode 100644
index 0000000..7ba9595
--- /dev/null
+++ b/tinyprintf/tinyprintf.h
@@ -0,0 +1,186 @@
+/*
+File: tinyprintf.h
+
+Copyright (C) 2004  Kustaa Nyholm
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+This library is really just two files: 'tinyprintf.h' and 'tinyprintf.c'.
+
+They provide a simple and small (+400 loc) printf functionality to
+be used in embedded systems.
+
+I've found them so useful in debugging that I do not bother with a
+debugger at all.
+
+They are distributed in source form, so to use them, just compile them
+into your project.
+
+Two printf variants are provided: printf and the 'sprintf' family of
+functions ('snprintf', 'sprintf', 'vsnprintf', 'vsprintf').
+
+The formats supported by this implementation are:
+'c' 'd' 'i' 'o' 'p' 'u' 's' 'x' 'X'.
+
+Zero padding and field width are also supported.
+
+If the library is compiled with 'PRINTF_SUPPORT_LONG' defined, then
+the long specifier is also supported. Note that this will pull in some
+long math routines (pun intended!) and thus make your executable
+noticeably longer. Likewise with 'PRINTF_LONG_LONG_SUPPORT' for the
+long long specifier, and with 'PRINTF_SIZE_T_SUPPORT' for the size_t
+specifier.
+
+The memory footprint of course depends on the target CPU, compiler and
+compiler options, but a rough guesstimate (based on a H8S target) is about
+1.4 kB for code and some twenty 'int's and 'char's, say 60 bytes of stack space.
+Not too bad. Your mileage may vary. By hacking the source code you can
+get rid of some hundred bytes, I'm sure, but personally I feel the balance of
+functionality and flexibility versus  code size is close to optimal for
+many embedded systems.
+
+To use the printf, you need to supply your own character output function,
+something like :
+
+void putc ( void* p, char c)
+{
+    while (!SERIAL_PORT_EMPTY) ;
+    SERIAL_PORT_TX_REGISTER = c;
+}
+
+Before you can call printf, you need to initialize it to use your
+character output function with something like:
+
+init_printf(NULL,putc);
+
+Notice the 'NULL' in 'init_printf' and the parameter 'void* p' in 'putc',
+the NULL (or any pointer) you pass into the 'init_printf' will eventually be
+passed to your 'putc' routine. This allows you to pass some storage space (or
+anything really) to the character output function, if necessary.
+This is not often needed but it was implemented like that because it made
+implementing the sprintf function so neat (look at the source code).
+
+The code is re-entrant, except for the 'init_printf' function, so it is safe
+to call it from interrupts too, although this may result in mixed output.
+If you rely on re-entrancy, take care that your 'putc' function is re-entrant!
+
+The printf and sprintf functions are actually macros that translate to
+'tfp_printf' and 'tfp_sprintf' when 'TINYPRINTF_OVERRIDE_LIBC' is set
+(default). Setting it to 0 makes it possible to use them along with
+'stdio.h' printf's in a single source file. When
+'TINYPRINTF_OVERRIDE_LIBC' is set, please note that printf/sprintf are
+not function-like macros, so if you have variables or struct members
+with these names, things will explode in your face.  Without variadic
+macros this is the best we can do to wrap these function. If it is a
+problem, just give up the macros and use the functions directly, or
+rename them.
+
+It is also possible to avoid defining tfp_printf and/or tfp_sprintf by
+clearing 'TINYPRINTF_DEFINE_TFP_PRINTF' and/or
+'TINYPRINTF_DEFINE_TFP_SPRINTF' to 0. This allows for example to
+export only tfp_format, which is at the core of all the other
+functions.
+
+For further details see source code.
+
+regs Kusti, 23.10.2004
+*/
+
+#ifndef __TFP_PRINTF__
+#define __TFP_PRINTF__
+
+#include <stdarg.h>
+
+/* Global configuration */
+
+/* Set this to 0 if you do not want to provide tfp_printf */
+#ifndef TINYPRINTF_DEFINE_TFP_PRINTF
+# define TINYPRINTF_DEFINE_TFP_PRINTF 1
+#endif
+
+/* Set this to 0 if you do not want to provide
+   tfp_sprintf/snprintf/vsprintf/vsnprintf */
+#ifndef TINYPRINTF_DEFINE_TFP_SPRINTF
+# define TINYPRINTF_DEFINE_TFP_SPRINTF 1
+#endif
+
+/* Set this to 0 if you do not want tfp_printf and
+   tfp_{vsn,sn,vs,s}printf to be also available as
+   printf/{vsn,sn,vs,s}printf */
+#ifndef TINYPRINTF_OVERRIDE_LIBC
+# define TINYPRINTF_OVERRIDE_LIBC 1
+#endif
+
+/* Optional external types dependencies */
+
+#if TINYPRINTF_DEFINE_TFP_SPRINTF
+# include <sys/types.h>  /* size_t */
+#endif
+
+/* Declarations */
+
+#ifdef __GNUC__
+# define _TFP_SPECIFY_PRINTF_FMT(fmt_idx,arg1_idx) \
+    __attribute__((format (printf, fmt_idx, arg1_idx)))
+#else
+# define _TFP_SPECIFY_PRINTF_FMT(fmt_idx,arg1_idx)
+#endif
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+typedef void (*putcf) (void *, char);
+
+/*
+   'tfp_format' really is the central function for all tinyprintf. For
+   each output character after formatting, the 'putf' callback is
+   called with 2 args:
+     - an arbitrary void* 'putp' param defined by the user and
+       passed unmodified from 'tfp_format',
+     - the character.
+   The 'tfp_printf' and 'tfp_sprintf' functions simply define their own
+   callback and pass to it the right 'putp' it is expecting.
+*/
+void tfp_format(void *putp, putcf putf, const char *fmt, va_list va);
+
+#if TINYPRINTF_DEFINE_TFP_SPRINTF
+int tfp_vsnprintf(char *str, size_t size, const char *fmt, va_list ap);
+int tfp_snprintf(char *str, size_t size, const char *fmt, ...) \
+     _TFP_SPECIFY_PRINTF_FMT(3, 4);
+int tfp_vsprintf(char *str, const char *fmt, va_list ap);
+int tfp_sprintf(char *str, const char *fmt, ...) \
+    _TFP_SPECIFY_PRINTF_FMT(2, 3);
+# if TINYPRINTF_OVERRIDE_LIBC
+#  define vsnprintf tfp_vsnprintf
+#  define snprintf tfp_snprintf
+#  define vsprintf tfp_vsprintf
+#  define sprintf tfp_sprintf
+# endif
+#endif
+
+#if TINYPRINTF_DEFINE_TFP_PRINTF
+void init_printf(void *putp, putcf putf);
+void tfp_printf(const char *fmt, ...) _TFP_SPECIFY_PRINTF_FMT(1, 2);
+# if TINYPRINTF_OVERRIDE_LIBC
+#  define printf tfp_printf
+# endif
+#endif
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif