c - 逐行替换txt中的字符串

Question

我如何在 txt 中逐行检查下面的字符串并替换每个字符串？

"FLD_CUSTORDREF_FLD"                 
"FLD_CUSTOMERNAME_FLD"            
"FLD_ADDRESSLINE1_FLD"             
"FLD_ADDRESSLINE2_FLD"             
"FLD_CITY_FLD"           

例如

If file line has "FLD_CITY_FLD"
  change to Header->City
else if file line has "FLD_CUSTOMERNAME_FLD" 
  change to Header->Name

我可以使用阅读每一行

while ( fgets ( line, sizeof line, file ) != NULL ) 

但是我该如何检查匹配的字符串呢？

Answer 1

您正在寻找 strstr 函数。

char *strstr(const char *haystack, const char *needle);

The strstr() function finds the first occurrence of the substring needle in the string haystack.

然而，替换部分可能更棘手。我只是 fprintf 结果而不是替换字符串。