とある現場の組込みエンジニア

[PR]

2025/11/05 (Wed.)

C言語のコメント/*~*/を削除するプログラム

実行オプションで特定文字列を変えるorソースコード内の#defineをいじれば、「/*」 「*/」以外の
範囲を消すこともできます。
注意：特定文字列は2文字まで。

ソースコード

/* del_comment.c */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#define NAME_MAX 256

/* Default setting */
#define INPUT_DEFAULT  "./input.c"
#define OUTPUT_DEFAULT "./output.c"
#define START_DEFAULT  "/*"
#define END_DEFAULT    "*/"

typedef struct del_comment {
	char in_name[NAME_MAX];
	char out_name[NAME_MAX];
	char start[3];
	char end[3];
} del_comment_t;

void analyze_option(del_comment_t *p, int argc, char *argv[]);
void print_info(del_comment_t *p);
void print_usage(void);

int main(int argc, char *argv[])
{
	int flag = 0;
	char str[3], c, str0_keep, str1_keep;
	FILE *in, *out;
	fpos_t fpos_in_keep;
	del_comment_t p;

	strcpy(p.in_name, INPUT_DEFAULT);
	strcpy(p.out_name, OUTPUT_DEFAULT);
	strcpy(p.start, START_DEFAULT);
	strcpy(p.end, END_DEFAULT);

	analyze_option(&p, argc, argv);
	print_info(&p);

	/* 入出力ファイルオープン */
	if ((in = fopen(p.in_name, "r")) == NULL) {
		printf("open error! [in]\n");
		exit(EXIT_FAILURE);
	}
	if ((out = fopen(p.out_name, "w")) == NULL) {
		printf("open error! [out]\n");
		fclose(in);
		exit(EXIT_FAILURE);
	}

	/* 最初の一回目だけの特殊な処理 */
	if ((str[0] = fgetc(in)) == EOF) {
		printf("EOF. No changed.\n");
		goto eof;
	}
	if ((str[1] = fgetc(in)) == EOF) {
		printf("EOF. No changed.\n");
		goto eof;
	}
	if ((str[0] == p.start[0]) && (str[1] == p.start[1])) {
		flag = 1;
	}
	if (flag == 1) {
		fgetpos(in, &fpos_in_keep);
		str0_keep = str[0];
		str1_keep = str[1];
		do {
			str[0] = str[1];
			str[1] = fgetc(in);
			if (str[1] == EOF) {
				printf("EOF. Changed, but incomplete.\n");
				fsetpos(in, &fpos_in_keep);
				fputc(str0_keep, out);
				fputc(str1_keep, out);
				while ((c = fgetc(in)) != EOF) {
					fputc(c, out);
				}
				goto eof;
			}
			if ((str[0] == p.end[0]) && (str[1] == p.end[1])) {
				flag = 0;
			}
		} while (flag == 1);
		str[1] = fgetc(in);
	} else {
		fputc(str[0], out);
	}

	/* 2回目以降の処理 */
	do {
		str[0] = str[1];
		str[1] = fgetc(in);
		if (str[1] == EOF) {
			fputc(str[0], out);
			printf("EOF, Changed all\n");
			goto eof;
		}
		if ((str[0] == p.start[0]) && (str[1] == p.start[1])) {
			flag = 1;
		}
		if (flag == 1) {
			fgetpos(in, &fpos_in_keep);
			str0_keep = str[0];
			str1_keep = str[1];
			do {
				str[0] = str[1];
				str[1] = fgetc(in);
				if (str[1] == EOF) {
					printf("EOF. Changed, but incomplete.\n");
					fsetpos(in, &fpos_in_keep);
					fputc(str0_keep, out);
					fputc(str1_keep, out);
					while ((c = fgetc(in)) != EOF) {
						fputc(c, out);
					}
					goto eof;
				}
				if ((str[0] == p.end[0]) && (str[1] == p.end[1])) {
					flag = 0;
				}
			} while (flag == 1);
			str[1] = fgetc(in);
		} else {
			fputc(str[0], out);
		}
	} while (1);

eof:
	fclose(in);
	fclose(out);
	return 0;
}

void analyze_option(del_comment_t *p, int argc, char *argv[])
{
	int result;

	while ((result=getopt(argc,argv,"i:o:s:e:h")) != -1) {
		switch (result) {
		case 'i':
			strcpy(p->in_name, optarg);
			break;
		case 'o':
			strcpy(p->out_name, optarg);
			break;
		case 's':
			if (strlen(optarg) == 2) {
				strcpy(p->start, optarg);
			} else {
				printf("-s option keyword must length 2.\n");
				printf("Use default [%s]\n", START_DEFAULT);
			}
			break;
		case 'e':
			if (strlen(optarg) == 2) {
				strcpy(p->end, optarg);
			} else {
				printf("-e option keyword must length 2.\n");
				printf("Use default [%s]\n", END_DEFAULT);
			}
			break;
		case 'h':
			print_usage();
			break;
		case '?':
			fprintf(stdout,"unknown\n");
			break;
		}
	}
}

void print_info(del_comment_t *p)
{
	printf("------Information---------------\n");
	printf("input_file  = [%s]\n", p->in_name);
	printf("output_file = [%s]\n", p->out_name);
	printf("start = [%s]\n", p->start);
	printf("end   = [%s]\n", p->end);
	printf("--------------------------------\n");
}

void print_usage(void)
{
	printf("-------------------Usage--------------------------------------------\n");
	printf("./program.exe -i [input_file] -o [output_file] -s [start] -e [end]\n");
	printf("--------------------------------------------------------------------\n");
	printf("option is not necessary.\n");
	printf("default [input_file] is [%s]\n", INPUT_DEFAULT);
	printf("default [output_file] is [%s]\n", OUTPUT_DEFAULT);
	printf("default [start] is [%s]\n", START_DEFAULT);
	printf("default [end] is [%s]\n", END_DEFAULT);
	printf("--------------------------------------------------------------------\n");
	exit(EXIT_SUCCESS);
}

コンパイル例

gcc -o del_comment del_comment.c

使い方

# オプションは必ず必要なわけではない
# デフォルト設定
# 入力ファイル名:
# 出力ファイル名:
# 削除開始キーワード:/*
# 削除終了キーワード:*/
./program.exe -i [input_file] -o [output_file] -s [start] -e [end]

検索用タグ　C言語

[1回]

2012/02/26 (Sun.) Comment(0) C言語