SVNからのミラー

adda.c

@@ -0,0 +1,102 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "common.h"
+
+const char *sofname = "adda";
+const char *syoumei = "Amiga/MacOS 9 to DOS, DOS to Amiga/MacOS 9";
+
+void amiga_to_dos(FILE *in, FILE *out) {
+  int c;
+
+  while ((c = fgetc(in)) != EOF) {
+    if (c != '\r') {
+      fputc(c, out);
+    }
+    if ((c = fgetc(in)) != '\n') {
+      fputc('\r', out);
+      fputc('\n', out);
+      ungetc(c, in);
+    } else {
+      fputc('\r', out);
+      fputc('\n', out);
+    }
+  }
+}
+
+void dos_to_amiga(FILE *in, FILE *out) {
+  int c;
+  int last_char = '\0';
+
+  while ((c = fgetc(in)) != EOF) {
+    if (last_char == '\r' && c == '\n') continue;
+    if (last_char != '\r' && c == '\n') fputc('\r', out);
+    else fputc(c, out);
+    last_char = c;
+  }
+}
+
+int detect_line_ending(FILE *in) {
+  int c;
+  int islf = 0;
+  int iscr = 0;
+  while ((c = fgetc(in)) != EOF) {
+    if (c == '\r') iscr = 1;
+    if (c == '\n') islf = 1;
+  }
+  if (iscr && islf) return 1; // DOS
+  return 0; // Amiga
+}
+
+void usage() {
+  fprintf(stderr, "%s-%s\n%s\n", sofname, version, syoumei);
+  fprintf(stderr, "usage: %s <ファイル.txt>\n", sofname);
+}
+
+int main(int argc, char *argv[]) {
+  if (argc != 2) {
+    usage();
+    return 1;
+  }
+
+  FILE *in = fopen(argv[1], "r");
+  if (in == NULL) {
+    perror("fopen input");
+    usage();
+    return 1;
+  }
+
+  FILE *tmp = fopen("tmp.txt", "w");
+  if (tmp == NULL) {
+    perror("fopen tmp");
+    fclose(in);
+    usage();
+    return 1;
+  }
+
+  int line_ending_style = detect_line_ending(in);
+  rewind(in);
+
+  if (line_ending_style == 0) { // AMIGA
+    amiga_to_dos(in, tmp);
+  } else { // DOS
+    dos_to_amiga(in, tmp);
+  }
+
+  fclose(in);
+  fclose(tmp);
+
+  if (remove(argv[1]) != 0) {
+    perror("元のファイルの削除");
+    usage();
+    return 1;
+  }
+  
+  if (rename("tmp.txt", argv[1]) != 0) {
+    perror("tmpファイル名の変更");
+    usage();
+    return 1;
+  }
+
+  return 0;
+}