linux fgets()

char *fgets(char *str, int n, FILE *stream);

if (fgets(buffer, sizeof(buffer), file) != NULL) {
    // 成功读取一行
} else if (feof(file)) {
    // 到达文件末尾
} else if (ferror(file)) {
    // 发生读取错误
}

char buffer[100];
if (fgets(buffer, sizeof(buffer), file) != NULL) {
    size_t len = strlen(buffer);
    if (len > 0 && buffer[len - 1] == '\n') {
        buffer[len - 1] = '\0'; // 移除换行符
    }
}

#include <stdio.h>
#include <string.h>

int main() {
    FILE *file = fopen("example.txt", "r");
    if (file == NULL) {
        perror("Failed to open file");
        return 1;
    }

    char buffer[100];
    while (fgets(buffer, sizeof(buffer), file) != NULL) {
        // 移除换行符
        size_t len = strlen(buffer);
        if (len > 0 && buffer[len - 1] == '\n') {
            buffer[len - 1] = '\0';
        }
        printf("%s\n", buffer);
    }

    fclose(file);
    return 0;
}