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Obtain the base file permissions to compare with the entry in C

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Obtain the base file permissions to compare with the entry in C

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I need to compare a basic file permission from a file with a file permission from input. The input should be saved in argv[1], and the permission information from file is stored in the classical struct stat stat_buf, specifically in the stat_buf.st_mode field.

An example of execution would be ./program 775. Then the program must say that is the same permission of some file's stat_buf.st_mode inside the code. But what I know is that the format of st_mode is tricky because it has to be read as octal, convert it to int, and so on. How to compare without problem?

the format of st_mode is tricky because it has to be read as octal [...]

Not particularly. Just use strtoul() with an appropriate base (8):

unsigned long mode = strtoul(argv[1], NULL, 8);
if (statbuf.st_mode == mode) {
    // permissions match
}

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