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Fix kernelinfo(1) reallocation loop never terminating.

This commit is contained in:
Jonas 'Sortie' Termansen 2016-10-02 13:50:26 +02:00
parent e400e3578e
commit 07b89e600d
1 changed files with 27 additions and 22 deletions
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49
utils/kernelinfo.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2012 Jonas 'Sortie' Termansen.
* Copyright (c) 2012, 2016 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@ -21,7 +21,7 @@
#include <err.h>
#include <errno.h>
#include <error.h>
#include <stdbool.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
@ -48,32 +48,37 @@ int main(int argc, char* argv[])
else
errx(1, "unknown option: %s\n", arg);
}
size_t bufsize = 32;
char* buf = (char*) malloc(bufsize);
if ( !buf )
error(1, errno, "malloc");
size_t size = 32;
char* buffer = (char*) malloc(size);
if ( !buffer )
err(1, "malloc");
for ( int i = 1; i < argc; i++ )
{
ssize_t ret;
retry:
ret = kernelinfo(argv[i], buf, bufsize);
if ( ret < 0 )
while ( true )
{
if ( errno == EINVAL )
ssize_t needed = kernelinfo(argv[i], buffer, size);
if ( needed < 0 )
{
error(1, 0, "%s: No such kernel string", argv[i]);
if ( errno == EINVAL )
{
warn("%s: No such kernel information", argv[i]);
break;
}
err(1, "kernelinfo: %s", argv[i]);
}
error(1, errno, "kernelinfo(\"%s\")", argv[i]);
if ( 0 < needed )
{
size = needed + 1;
buffer = (char*) realloc(buffer, size);
if ( !buffer )
err(1, "malloc");
continue;
}
printf("%s\n", buffer);
break;
}
if ( ret )
{
buf = (char*) realloc(buf, ret);
if ( !buf )
error(1, errno, "realloc");
bufsize = ret;
goto retry;
}
printf("%s\n", buf);
}
if ( ferror(stdout) || fflush(stdout) == EOF )
err(1, "stdout");
return 0;
}