💾 Archived View for thebackupbox.net › ~epoch › csv.txt captured on 2023-04-19 at 22:34:08.
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#include <stdio.h>
#include <string.h>
// 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;
}