Implement the itoa() non-standard function.

3 files changed, 170 insertions, 0 deletions

diff --git a/src/common/Makefile.am b/src/common/Makefile.am
index 2f6fd6d..4da8170 100644
--- a/src/common/Makefile.am
+++ b/src/common/Makefile.am
@@ -17,6 +17,7 @@ libcommon_la_SOURCES =					\
 	hex.h hex.c							\
 	ibuf.h ibuf.c						\
 	io.h io.c							\
+	itoa.h itoa.c						\
 	fnv1a.h fnv1a.c						\
 	leb128.h leb128.c					\
 	macros.h							\
diff --git a/src/common/itoa.c b/src/common/itoa.c
new file mode 100644
index 0000000..56fc638
--- /dev/null
+++ b/src/common/itoa.c
@@ -0,0 +1,135 @@
+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * itoa.c - conversion d'un nombre en chaîne de caractères
+ *
+ * Copyright (C) 2023 Cyrille Bagard
+ *
+ *  This file is part of Chrysalide.
+ *
+ *  Chrysalide is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Chrysalide 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Chrysalide.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "itoa.h"
+
+
+#include <assert.h>
+#include <malloc.h>
+#include <math.h>
+
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : n    = nombre à transformer.                                 *
+*                base = base à considérer pour la sortie.                     *
+*                                                                             *
+*  Description : Convertit une valeur en une forme textuelle.                 *
+*                                                                             *
+*  Retour      : Chaîne de caractères mises en place.                         *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+char *itoa(long long n, unsigned char base)
+{
+    char *result;                           /* Texte à retourner           */
+    size_t size;                            /* Taille de chaîne en sortie  */
+    char *iter;                             /* Tête d'écriture             */
+#ifndef NDEBUG
+    size_t counter;                         /* Décompte des impressions    */
+#endif
+    long long rem;                          /* Unité à transposer          */
+
+    /**
+     * Préparation du stockage de la chaîne finale.
+     */
+
+    if (n == 0)
+        size = 1;
+
+    else if (n < 0)
+    {
+        size = (size_t)(log(-n) / log(base) + 1);
+        size++;
+    }
+    else
+        size = (size_t)(log(n) / log(base) + 1);
+
+    /* '\0' final */
+    size++;
+
+    result = malloc(size);
+    if (result == NULL) goto exit;
+
+    /**
+     * Remplissage avec la valeur textuelle correspondant à la valeur fournie.
+     */
+
+#ifndef NDEBUG
+    counter = 0;
+#endif
+
+    if (n < 0)
+    {
+        result[0] = '-';
+#ifndef NDEBUG
+        counter++;
+#endif
+
+        n *= -1;
+
+    }
+
+    iter = result + size - 1;
+
+    *iter-- = '\0';
+#ifndef NDEBUG
+    counter++;
+#endif
+
+    if (n == 0)
+    {
+        *iter-- = '0';
+#ifndef NDEBUG
+        counter++;
+#endif
+    }
+
+    else
+        while (n > 0)
+        {
+            rem = n % base;
+
+            if (rem >= 10)
+                *iter-- = 'a' + (rem - 10);
+            else
+                *iter-- = '0' + rem;
+
+#ifndef NDEBUG
+            counter++;
+#endif
+
+            n = n / base;
+
+        }
+
+    assert(counter < size);
+
+ exit:
+
+    return result;
+
+}
diff --git a/src/common/itoa.h b/src/common/itoa.h
new file mode 100644
index 0000000..4608a50
--- /dev/null
+++ b/src/common/itoa.h
@@ -0,0 +1,34 @@
+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * itoa.h - prototypes pour la conversion d'un nombre en chaîne de caractères
+ *
+ * Copyright (C) 2023 Cyrille Bagard
+ *
+ *  This file is part of Chrysalide.
+ *
+ *  Chrysalide is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Chrysalide 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Chrysalide.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#ifndef _COMMON_ITOA_H
+#define _COMMON_ITOA_H
+
+
+
+/* Convertit une valeur en une forme textuelle. */
+char *itoa(long long, unsigned char);
+
+
+
+#endif  /* _COMMON_ITOA_H */