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 Code: readline

Read one line from the specified file. The newline char is discarded. If the line is empty (CR or LF only), it is discarded and the next line gotten.

Arguments

• *file
  Pointer to the FILE struct representing the file to read from.
• *line
  Point to the character array to store the results in.
• max
  Maximum number of characters the array will hold. Includes the zero at the end.

Return

Returns 0 on failure, 1 on success.

Notes

This may leave a dangling CR or LF as the first character to be read next time. That's why it ignores empty lines.

//##############################################################################
// read one line from the specified file.  the newline char is discarded
// return 0 on failure, 1 on success
//##############################################################################
int readline(FILE *file, char *line, int max)
{
    int  i = 0;
    
    while(i < max - 1) {
        char result = fgetc(file);
        if (feof(file) || ferror(file)) return (0);
        if (i == 0 && result == '\n') continue;
        if (i == 0 && result == '\r') continue;
        if (result == '\n') break;
        if (result == '\r') break;
        line[i++] = result;
    }
    line[i] = '\0';
    return (1);
}

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