c - 将文件的全部内容读入 c char *，包括新行

Question

我正在寻找一个跨平台(Windows + Linux)解决方案来将整个文件的内容读入 char *。

这是我现在得到的:

FILE *stream;
char *contents;
fileSize = 0;

//Open the stream
stream = fopen(argv[1], "r");

//Steak to the end of the file to determine the file size
fseek(stream, 0L, SEEK_END);
fileSize = ftell(stream);
fseek(stream, 0L, SEEK_SET);

//Allocate enough memory (should I add 1 for the \0?)
contents = (char *)malloc(fileSize);

//Read the file 
fscanf(stream, "%s", contents);     

//Print it again for debugging
printf("Read %s\n", contents);

不幸的是，这只会打印文件中的第一行，所以我假设 fscanf 在第一个换行符处停止。但是我想阅读整个文件，包括并保留换行符。我不想使用 while 循环和 realloc 来手动构造整个字符串，我的意思是必须有更简单的方法吗？

Answer 1

可能是这样的？

FILE *stream;
char *contents;
fileSize = 0;

//Open the stream. Note "b" to avoid DOS/UNIX new line conversion.
stream = fopen(argv[1], "rb");

//Seek to the end of the file to determine the file size
fseek(stream, 0L, SEEK_END);
fileSize = ftell(stream);
fseek(stream, 0L, SEEK_SET);

//Allocate enough memory (add 1 for the \0, since fread won't add it)
contents = malloc(fileSize+1);

//Read the file 
size_t size=fread(contents,1,fileSize,stream);
contents[size]=0; // Add terminating zero.

//Print it again for debugging
printf("Read %s\n", contents);

//Close the file
fclose(stream);
free(contents);