diff options
Diffstat (limited to 'src/common')
| -rw-r--r-- | src/common/Makefile.am | 1 | ||||
| -rw-r--r-- | src/common/itoa.c | 135 | ||||
| -rw-r--r-- | src/common/itoa.h | 34 |
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 */ |