如何逐字符读取文件，直到特定的字符串完成？

def read_until_specific_string(file_path, specific_string):
    with open(file_path, 'r') as file:
        current_char = file.read(1)
        while current_char:
            if current_char == specific_string[0]:
                # Start comparing characters
                match = True
                for i in range(1, len(specific_string)):
                    next_char = file.read(1)
                    if next_char != specific_string[i]:
                        match = False
                        break
                if match:
                    # Specific string found
                    break
            current_char = file.read(1)

    # Perform further processing after specific string is found
    # ...

# 调用示例
file_path = 'path/to/file.txt'
specific_string = 'example'
read_until_specific_string(file_path, specific_string)