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Implemented strcatarr function to concatinate an array of strings into one string.

This commit is contained in:
Wael Karram 2022-03-26 12:58:42 +03:00
parent c680d07ba4
commit 27046e6bbb
Signed by: wael
GPG Key ID: 3B356038CCB10808
2 changed files with 105 additions and 0 deletions
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63
strings/strcatarr.c Normal file
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/**
* C_lib Copyright (C) 2021 Wael Karram.
*
* This program 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, version 3 of the License.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
/* This file contains the function implementation for string append. */
/* Include guards + includes. */
#ifndef STRCATARR_C
#define STRCATARR_C
/* Include statements. */
#include "strcatarr.h"
#endif /* STRCATARR_C */
/**
* This function takes an array of strings, array of lengths (optional) and length of arrays.
* Allocates a new string which is the result of copying and appending all the provided strings.
* Returns NULL on failure.
* If no lengths specified, falls back to strlen.
* Assumes all strings to not be null.
*/
static inline char *strcatarr(char **strings, size_t *lens, size_t len) {
/* Sanity check. */
assert(strings && len);
/* Local variables. */
size_t total_length = 0L;
size_t i;
char *result;
/* Calculate the total length. */
if (!lens)
for (i = 0L; i < len; i++) /* O(nk) */
total_length += strlen(strings[i]);
else
for (i = 0L; i < len; i++) /* O(n) */
total_length += lens[i];
/* For null terminator. */
total_length++;
/* Attempt to allocate the result buffer. */
result = (char*) malloc(sizeof(char) * total_length);
if (!result)
return NULL;
/* Concatinate the strings. */
for (i = 0L; i < len; i++)
strcat(result, strings[i]);
/* Return the result. */
return result;
}

42
strings/strcatarr.h Normal file
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/**
* C_lib Copyright (C) 2021 Wael Karram.
*
* This program 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, version 3 of the License.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
/* This header file defines a strcatarr function, for general string array concatination. */
/* Include guards + includes. */
#ifndef STRCATARR_H
#define STRCATARR_H
/* Include string.h */
#include <string.h>
/* Include assert.h to allow code generation, but only run with debug flag. */
#ifdef DEBUG
#ifndef NDEBUG
#define NDEBUG
#endif /* NDEBUG. */
#endif /* DEBUG. */
#include <assert.h>
/* Constants. */
#define NULL_CHAR '\0'
/**
* This function takes an array of strings, array of lengths (optional) and length of arrays.
* Allocates a new string which is the result of copying and appending all the provided strings.
* Returns NULL on failure.
* If no lengths specified, falls back to strlen.
*/
static inline char *strcatarr(char **strings, size_t *lens, size_t len);
#endif /* STRCATARR_H */