練習用です。いろんなものがごちゃまぜです。
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| 1 | +#define _CRT_SECURE_NO_WARNINGS | |
| 2 | +#include <stdio.h> | |
| 3 | +#include <stdlib.h> | |
| 4 | +#include <string.h> | |
| 5 | + | |
| 6 | +#define MAX_CHAR 1024 | |
| 7 | +#define SUCCESS 0 | |
| 8 | +#define ERROR_ARGUMENT_NUMBER 1 | |
| 9 | +#define ERROR_CANNOT_OPEN_FILE 2 | |
| 10 | +#define ERROR_CANNOT_CLOSE_FILE 3 | |
| 11 | + | |
| 12 | +char *ErrorMessage[4] = { | |
| 13 | + "成功", | |
| 14 | + "ファイル名を指定してください。", | |
| 15 | + "ファイルを開けませんでした。", | |
| 16 | + "ファイルを閉じれませんでした。" | |
| 17 | +}; | |
| 18 | + | |
| 19 | +int main(int argc, char* argv[]){ | |
| 20 | + FILE *fp; | |
| 21 | + int i = 0; | |
| 22 | + char buffer[MAX_CHAR]; | |
| 23 | + char c; | |
| 24 | + char **line = NULL,**lineInitialValue = NULL; | |
| 25 | + int lineCount = 0; | |
| 26 | + int result = SUCCESS; | |
| 27 | + | |
| 28 | + if (argc != 2){ | |
| 29 | + result = ERROR_ARGUMENT_NUMBER; | |
| 30 | + } else { | |
| 31 | + fp = fopen(argv[1], "r"); | |
| 32 | + if (fp == NULL) { | |
| 33 | + result = ERROR_CANNOT_OPEN_FILE; | |
| 34 | + } else { | |
| 35 | + while ( NULL != fgets(buffer, MAX_CHAR, fp)){ | |
| 36 | + lineCount++; | |
| 37 | + } | |
| 38 | + rewind(fp); | |
| 39 | + lineInitialValue = (char **)calloc(lineCount, sizeof(char *)); | |
| 40 | + line = lineInitialValue; | |
| 41 | + | |
| 42 | + while (EOF != (c = getc(fp))) { | |
| 43 | + if ( (c == '\n') || ((c == EOF) && (i != 0))) { | |
| 44 | + if ( c == EOF){ | |
| 45 | + i--; | |
| 46 | + } else { | |
| 47 | + buffer[i] = c; | |
| 48 | + } | |
| 49 | + buffer[i + 1] = '\0'; | |
| 50 | + *line = (char*)malloc(i + 2); | |
| 51 | + strcpy(*line, buffer); | |
| 52 | + line++; | |
| 53 | + i = 0; | |
| 54 | + } else { | |
| 55 | + buffer[i] = c; | |
| 56 | + i++; | |
| 57 | + } | |
| 58 | + } | |
| 59 | + if ( 0 != fclose(fp)){ | |
| 60 | + result = ERROR_CANNOT_CLOSE_FILE; | |
| 61 | + } | |
| 62 | + } | |
| 63 | + } | |
| 64 | + | |
| 65 | + line = lineInitialValue; | |
| 66 | + for (i = lineCount - 1; i >= 0; i--){ | |
| 67 | + printf(line[i]); | |
| 68 | + } | |
| 69 | + | |
| 70 | + for (i = 0; i < lineCount; i++) { | |
| 71 | + if (line[i]) { | |
| 72 | + free(line[i]); | |
| 73 | + } | |
| 74 | + } | |
| 75 | + if (lineInitialValue) { | |
| 76 | + free(lineInitialValue); | |
| 77 | + } | |
| 78 | + | |
| 79 | + if (result != SUCCESS){ | |
| 80 | + printf("%s\n", ErrorMessage[result]); | |
| 81 | + } | |
| 82 | + return result; | |
| 83 | +} |