How do I read a delimited file that has embedded delimiters in the data?

Suppose you are reading a comma separated file, but your
data contains commas in it. For example, say your file contains age name and weight and
looks like the one below.

48,'Bill Clinton',210
50,'George Bush, Jr.',180

Say you read this file as you would any other comma
delimited file, like the example shown below.

 DATA guys1;
  length name $ 20 ;
  INFILE 'readdsd2.txt' DELIMITER=',' ;
  INPUT age name weight ;
RUN;
 
PROC PRINT DATA=guys1;
RUN;

But, as we see below, the data were not read as we
wished. The quotes are treated as data, and George Bush lost the , Jr off
his name, and his weight is missing. This is because SAS treated the ,
in George Bush’s name as a indicating the end of the variable, which is not
what we wanted.

OBS         NAME         AGE    WEIGHT

1     'Bill Clinton'     48      210
2     'George Bush       50        .

Below, we use the dsd option to read the same file.

DATA guys2;
  length name $ 20 ;
  INFILE 'readdsd2.txt' DELIMITER=',' DSD ;
  INPUT age name weight ;
RUN;
 
PROC PRINT DATA=guys2;
RUN;

As you see in the output below, SAS properly treated the
quotes as delimiters, and it read in Mr. Bush’s name properly and his weight properly.

OBS          NAME          AGE    WEIGHT

 1     Bill Clinton         48      210
 2     George Bush, Jr.     50      180