FreeCalypso > hg > freecalypso-tools
view ffstools/cal2text/mkdir.c @ 965:2969032bdfac
fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing
The only 100% safe way to pass a NULL pointer as a function argument
in K&R C is to cast 0 to a pointer type; failing to do so may cause
mysterious bugs (invalid stack frames or garbage in argument registers)
on 64-bit machines. This issue has already been fixed in most of
FC host tools, but I just found some missed spots: passing of NULL UDH
to PDU encoding functions in fcup-smsend[mult] in the case of single
(not concatenated) SMS.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 01 Sep 2023 07:33:51 +0000 |
parents | d41edd329670 |
children |
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line source
#include <sys/types.h> #include <sys/stat.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> mkdir_existok(pathname) char *pathname; { int rc; struct stat st; rc = stat(pathname, &st); if (rc < 0) { rc = mkdir(pathname, 0777); if (rc < 0) { perror(pathname); exit(1); } return(0); } else { if (S_ISDIR(st.st_mode)) return(0); else { fprintf(stderr, "error: %s already exists and is not a directory\n", pathname); exit(1); } } }