Tutorial :C: sprintf leads to SIGSEGV core via an strlen



Question:

My C application has the following two lines:

char buf[1024];  sprintf(buf, "%s/game/rabbit/habit/cmd/talkPipe", getenv("APPLICATION_PATH"));  

The application sporadically crashes with SIGSEGV in the following manner:

strlen(ff2ba231, 0, ffbfe1d0, 10, 7fff24d7, 0)+0x50  sprintf(ffbfe2a4, ff2ba231, 0, 74656400, 12, ff362ef2)+0x24  RabbitTalk(ffbfea80, ffbfee50, 1, d, ffbfea12, 0)+0x21c  ...  

Can anyone pass a hint on where/what might be the problem?

Thanx a lot,


Solution:1

Maybe because getenv returns NULL ?

Even if it's not the problem at hand you should check for NULL : most old style C functions don't.


Solution:2

getenv() would return NULL if the environment variable not exist (not exported), this cause the SIGSEGV


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