[英]How to get a line from csv file with a custom fgets
我目前正在用C編寫一個程序,該程序可以從CSV文件讀取數據,我具有定義的緩沖區大小,但是在將每一行與緩沖區分開時遇到了麻煩。 我可以通過檢查'\\ n'字符來查看行的結尾。 我不能從緩沖區中提取該行進行解析。 有人有想法嗎?
#ifndef BUFFSIZE
#define BUFFSIZE 4096
#endif
int main() {
int fd;
int fdBin;
char * buf = malloc(BUFFSIZE);
int count = 0;
bool EOFFlag = false;
fd = open("SongCSV.csv", O_RDONLY);
fdBin = open("BinarySongData.bin", O_CREAT | O_WRONLY, "0600");
if (fd == -1) {
printf("failed to open a file\n");
exit(1);
}
off_t offset = 0;
off_t offsetOld = 0;
int readBytes;
while (!EOFFlag) {
offsetOld = offset;
offset = lseek(fd, offset - offsetOld, SEEK_CUR);
readBytes = read(fd, buf, BUFFSIZE);
printf("\n\n%lld\n\n", (offset));
int i = 0;
int commaCounter = 0;
while (i < readBytes) {
if (buf[i] != '\n') {
}
if (buf[i] == '\n') {
printf("\t\t THIS IS END OF LINE \t%d", i);
commaCounter = 0;
}
if (buf[i] == ',') {
commaCounter++;
if (commaCounter == 4) {
printf("****Album Name****");
}
}
write(fdBin, buf, BUFFSIZE);
printf("%c", buf[i]);
i++;
}
if (readBytes < BUFFSIZE) {
EOFFlag = true;
printf("\nREACHED END OF FILE");
}
printf("\n");
printf("AA: END OF LINE ****%d*****", count);
count++;
}
close(fd);
close(fdBin);
return 0;
}
我這樣做很簡單。 我很快就做到了,任何疑問都只是問我,干杯。
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
int main()
{
int len = sending();
char *firstline;
int i = 0;
char buf[0];
int rd ;
int fd = open("hey.csv", O_RDONLY);
rd = read(fd, buf, 1);
firstline = malloc(sizeof(char) * len);
while (i != len)
{
firstline[i] = buf[0];
i++;
rd = read(fd, buf, 1);
}
firstline[i] = '\0';
printf("%s\n", firstline);
return (0);
}
int sending()
{
int fd = open("hey.csv", O_RDONLY);
char buf[1];
int r = 0;
r = read(fd, buf, 1);
int len = 0;
while (buf[0] != '\n')//getting exact size to malloc
{
len++;
r = read(fd, buf, 1);
}
return len;
}
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