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path_from: csv.c
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refs/heads/master:/csv.c

 #include 
 #include 
 // this is supposed to be an attempt at implementing the type of stuff in:
 // https://datatracker.ietf.org/doc/html/rfc7230#section-3.2.6
 // but I can't be fucked to shave this yak all the way right now.
 // pipe this into jq -r to get the string unquoted and unescaped I guess

 int main(int argc,char *argv[]) {
   char *name;
   char *nend;
   char *value;
   char *vend;
   if(argc < 2) {
     printf("usage: csv derp name\n");
     return 1;
   }
   name=argv[1];
   for(;;) {
     while(*name && (*name == ' ' || *name == '\t')) name++;//skip over whitespace /before/ the name
     value=strchr(name,'=');//value will ALWAYS start after first =s after the name.
     if(!value) return __LINE__;//there wasn't a = after what should be a name.
     nend=value-1;
     while(*nend == ' ' || *nend == '\t') nend--; //work backwards from the =
     nend++;
     *nend=0;//null out the byte after the name
     *value=0;
     value++;
     while(*value && (*value == ' ' || *value == '\t')) value++;//skip over whitespace
     if(*value != '"') return __LINE__;//malformed because missing a double-quote after the =
     value++;
     vend=strchr(value,'"');
     if(!vend) return __LINE__;//malformed because missing a closing double-quote
     while(vend && *vend && *(vend-1)=='\\') vend=strchr(vend+1,'"');
     if(!vend) return __LINE__;//malformed because missing an unescape double-quote to close value.
     *vend=0;
     //fprintf(stderr,"'%s' = '%s'\n",name,value);
     if(argc == 2) {
       printf("%s\n",name);
     }
     if(argc == 3) {
       if(!strcmp(name,argv[2])) {
         printf("\"%s\"\n",value);
       }
     }
     vend++;
     while(*vend && (*vend == ' ' || *vend == '\t')) vend++;
     if(*vend == '\0') break;//we're at the end of the string, exit.
     if(*vend != ',') return __LINE__;//need a comma after the closing string if not at end
     name=vend+1;
     if(!*name) return __LINE__;//there was a comma at the end of the input
   }
   return 0;
 }