/*++ /* NAME /* split_nameval 3 /* SUMMARY /* name-value splitter /* SYNOPSIS /* #include <split_nameval.h> /* /* const char *split_nameval(buf, name, value) /* char *buf; /* char **name; /* char **value; /* DESCRIPTION /* split_nameval() takes a logical line from readlline() and expects /* text of the form "name = value" or "name =". The buffer /* argument is broken up into name and value substrings. /* /* Arguments: /* .IP buf /* Result from readlline() or equivalent. The buffer is modified. /* .IP name /* Upon successful completion, this is set to the name /* substring. /* .IP value /* Upon successful completion, this is set to the value /* substring. /* FEATURES /* SEE ALSO /* dict(3) mid-level dictionary routines /* BUGS /* DIAGNOSTICS /* Fatal errors: out of memory. /* /* The result is a null pointer in case of success, a string /* describing the error otherwise: missing '=' after attribute /* name; missing attribute name. /* LICENSE /* .ad /* .fi /* The Secure Mailer license must be distributed with this software. /* AUTHOR(S) /* Wietse Venema /* IBM T.J. Watson Research /* P.O. Box 704 /* Yorktown Heights, NY 10598, USA /*--*/ /* System libraries. */ #include "sys_defs.h" #include <ctype.h> #include <string.h> /* Utility library. */ #include <msg.h> #include <stringops.h> /* split_nameval - split text into name and value */ const char *split_nameval(char *buf, char **name, char **value) { char *np; /* name substring */ char *vp; /* value substring */ char *cp; char *ep; /* * Ugly macros to make complex expressions less unreadable. */ #define SKIP(start, var, cond) \ for (var = start; *var && (cond); var++); #define TRIM(s) { \ char *p; \ for (p = (s) + strlen(s); p > (s) && ISSPACE(p[-1]); p--); \ *p = 0; \ } SKIP(buf, np, ISSPACE(*np)); /* find name begin */ if (*np == 0) return ("missing attribute name"); SKIP(np, ep, !ISSPACE(*ep) && *ep != '='); /* find name end */ SKIP(ep, cp, ISSPACE(*cp)); /* skip blanks before '=' */ if (*cp != '=') /* need '=' */ return ("missing '=' after attribute name"); *ep = 0; /* terminate name */ cp++; /* skip over '=' */ SKIP(cp, vp, ISSPACE(*vp)); /* skip leading blanks */ TRIM(vp); /* trim trailing blanks */ *name = np; *value = vp; return (0); }