95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
#include "io_file_op.hpp"
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#include <string.h>
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FILE *w_open_file(const char *filepath)
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{
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if (filepath == nullptr)
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{
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return nullptr;
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}
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FILE *file = fopen(filepath, "rwb");
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return file;
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}
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file_content w_read_file(FILE *file)
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{
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file_content __result = init_file_content();
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if (file == nullptr)
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{
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fprintf(stderr, "Error: Invalid file in w_read_file\n");
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return __result;
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}
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fseek(file, 0, SEEK_END);
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long file_size = ftell(file);
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if (file_size < 0)
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{
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fprintf(stderr, "Error: Could not determine file size.\n");
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return init_file_content();
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}
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rewind(file);
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size_t size = (size_t)file_size;
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char *buffer = (char *)malloc(sizeof(char) * (size + 1));
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if (buffer == NULL)
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{
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fprintf(stderr, "Error: Cant Allocate buffer to read.\n");
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return init_file_content();
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}
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size_t result = fread(buffer, 1, size, file);
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if (result != size)
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{
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fprintf(stderr, "Error: Reading error in w_read_file.\n");
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free(buffer);
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return init_file_content();
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}
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buffer[size] = '\0';
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size_t line_start = 0;
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char **lines = NULL;
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for (size_t i = 0; i <= size; i++)
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{
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if (buffer[i] == '\n' || buffer[i] == '\0')
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{
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size_t line_length = i - line_start;
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char *line = (char *)malloc(line_length + 1);
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if (line == NULL)
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{
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for (int j = 0; j < __result.num_lines; j++)
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free(lines[j]);
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free(lines);
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free(buffer);
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fprintf(stderr, "Error: Cant Allocate line buffer.\n");
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return init_file_content();
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}
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memcpy(line, &buffer[line_start], line_length);
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line[line_length] = '\0';
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char **new_lines = (char **)realloc(lines, ((size_t)(__result.num_lines + 1)) * sizeof(char *));
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if (new_lines == NULL)
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{
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for (int j = 0; j < __result.num_lines; j++)
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free(lines[j]);
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free(line);
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free(lines);
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free(buffer);
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fprintf(stderr, "Error: Cant realloc lines array.\n");
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return init_file_content();
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}
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lines = new_lines;
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lines[__result.num_lines++] = line;
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line_start = i + 1;
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}
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}
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return __result;
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}
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file_content init_file_content()
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{
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file_content r;
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r.lines = NULL;
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r.num_lines = 0;
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return r;
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} |