On Tue, Sep 4, 2012 at 2:03 PM, Scott Ford <scott_j_f...@yahoo.com> wrote:
> I have had to move a string type field like a parameter to a field like > this, > > Jobn char[40]; > > memset(Jobn,'0',sizeof(Jobn)); > strcpy(Jobn,xxxxx); > > Otherwise strcmp fails, where xxxxx is the parameter string > > > "fails" how? the memset() has no effect other than to zero out the data after the string terminator. The conventional safe way is: strncpy(Jobn, xxxxx, sizeof(Jobn)-1); Jobn[sizeof(Jobn)-1] = '\0'; // ensure terminator in case strlen(xxxxx) >= sizeof(Jobn) (BTW - strncpy() also zeros bytes after the terminator, if necessary) For more information, see: http://www.courtesan.com/todd/papers/strlcpy.html under "Common Misconceptions" Kirk Wolf Dovetailed Technologies PS> The above strncpy() idiom will truncate a source string longer than the target. If you want to instead raise an error: strncpy(Jobn, xxxxx, sizeof(Jobn)-1); if (Jobn[sizeof(Jobn)-1]) ... // error if strlen(xxxxx) > sizeof(Jobn)-1 There's nothing z-unique here... standard pitfalls and practices of using C that apply anywhere ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
