diff options
Diffstat (limited to 'manual/stdio.texi')
| -rw-r--r-- | manual/stdio.texi | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/manual/stdio.texi b/manual/stdio.texi index 6ff1806..fd7ed0c 100644 --- a/manual/stdio.texi +++ b/manual/stdio.texi @@ -2428,31 +2428,29 @@ string. Here is an example of doing this: char * make_message (char *name, char *value) @{ - /* @r{Guess we need no more than 100 chars of space.} */ - int size = 100; - char *buffer = (char *) xmalloc (size); - int nchars; + /* @r{Guess we need no more than 100 bytes of space.} */ + size_t size = 100; + char *buffer = xmalloc (size); @end group @group - if (buffer == NULL) - return NULL; - /* @r{Try to print in the allocated space.} */ - nchars = snprintf (buffer, size, "value of %s is %s", - name, value); + int buflen = snprintf (buffer, size, "value of %s is %s", + name, value); + if (! (0 <= buflen && buflen < SIZE_MAX)) + fatal ("integer overflow"); @end group @group - if (nchars >= size) + if (buflen >= size) @{ /* @r{Reallocate buffer now that we know how much space is needed.} */ - size = nchars + 1; - buffer = (char *) xrealloc (buffer, size); + size = buflen; + size++; + buffer = xrealloc (buffer, size); - if (buffer != NULL) - /* @r{Try again.} */ - snprintf (buffer, size, "value of %s is %s", - name, value); + /* @r{Try again.} */ + snprintf (buffer, size, "value of %s is %s", + name, value); @} /* @r{The last call worked, return the string.} */ return buffer; |