In character.c within R 2.6.1, the function do_gsub contains the following
code:
1199 if (STRING_ELT(pat, 0) == NA_STRING) {
1200 PROTECT(ans = allocVector(STRSXP, n));
1201 for(i = 0; i < n; i++) SET_STRING_ELT(ans, i, NA_STRING);
1202 UNPROTECT(1);
1203 return ans;
1204 }
1205
1206 if (length(pat) < 1 || length(rep) < 1) error(R_MSG_IA);
Line 1206 checks that pat contains at least one element. However, line 1199
has already attempted to access the first element. The check should surely
come first.
Andrew Runnalls
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