C语言 拆分长字符串

Question

我有一个存档results.csv，我需要阅读此存档的前两行，拆分第二行并将它们打印在output.txt上。不知何故，它没有打印任何东西，但我不知道原因。

我没有添加我确定没问题的功能。

命令：a.c results.csv

第一行：date,home_team,away_team,home_score,away_score,tournament,city,country,neutral

第二行：18721130,Scotland,England,0,0,Friendly,Glasgow,Scotland,FALSE

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
typedef struct
{
char *line1;
long int date;
char *h_team;
char *a_team;
int gols_h_team;
int gols_a_team;
char *reason;
char *city;
char *country;
char *neutral_field;
}Data;
void alloc_Data(Data *d, int size)
{
d->line1 = (char*)malloc(50*sizeof(char)); 
d->h_team = (char*)malloc(30*sizeof(char)); 
d->a_team = (char*)malloc(30*sizeof(char)); 
d->reason = (char*)malloc(30*sizeof(char)); 
d->city = (char*)malloc(30*sizeof(char)); 
d->country = (char*)malloc(30*sizeof(char)); 
d->neutral_field = (char*)malloc(9*sizeof(char)); 
}
void store(Data *d, FILE *input, FILE *output, int size)
{
fscanf(input,  "%s", d[0].line1);
fprintf(output,  "%sn", d[0].line1);
for(int i = 1; i < size; i++)
{
fscanf(input, "%li,%[^,]s%[^,]s%d,%d,%[^,]s%[^,]s%[^,]s%[^,]s", &d[i].date, d[i].h_team, d[i].a_team, &d[i].gols_h_team, &d[i].gols_a_team, d[i].reason, d[i].city, d[i].country, d[i].neutral_field );
fprintf(output, "%li,%s,%s,%d,%d,%s,%s,%s,%sn", d[i].date, d[i].h_team, d[i].a_team, d[i].gols_h_team, d[i].gols_a_team, d[i].reason, d[i].city, d[i].country, d[i].neutral_field );
}
}
int main(int argc, char *argv[])
{
FILE *input;
FILE *output;
char *string = "output.txt";
int size = 2;
open_input(argv, &input);   
open_output(string, &output);   
Data *d;
d = (Data*)malloc(size*sizeof(Data)); 
alloc_Data(d, size);
store(d, input, output, size);
free(d);
return 0;
}

Answer 1

OP的fscanf()格式在%[^,]后被一个s搞砸了，缺少,。 @Gem泰勒

更好的选择是使用fgets()读取所有行。 (包括第一个(

// fscanf(input, "%li,%[^,]s%[^,]s%d,%d,%[^,]s%[^,]s%[^,]s%[^,]s",...d[i].neutral_field );
#define EXPECTED_MAX_BUFFER_SIZE 150
char buffer[EXPECTED_MAX_BUFFER_SIZE * 2];  // suggest using 2x expected max size
if (fgets(buffer, sizeof buffer, input)) {

然后使用sscanf()解析团队结果。 最后使用" %n"是测试整个sscanf()是否成功而没有额外垃圾的简单方法。sscanf()应该得到宽度限制和复杂的扫描的好处，有一些定义来管理说明符。 请注意"%29[^,]"后没有s

int n = 0;
#define FDat "%li ,"
#define FScr "%d ,"
#define Ftxt " %29[^,],"
#define Fneu " %8[^,]"
sscanf(buffer, FDat Ftxt Ftxt FScr FScr Ftxt Ftxt Ftxt Fneu " %n", 
&d[i].date, d[i].h_team, d[i].a_team, 
&d[i].gols_h_team, &d[i].gols_a_team, 
d[i].reason, d[i].city, d[i].country, d[i].neutral_field, &n);
if (n > 0 && buffer[n] == '') {
// success
fprintf(output, ...
} else {
// bad input
}