diff options
Diffstat (limited to 'src/main.c')
| -rw-r--r-- | src/main.c | 47 |
1 files changed, 29 insertions, 18 deletions
@@ -130,32 +130,43 @@ xvsprintf (char *fmt, va_list ap) { int size, nchars; char *buffer; + va_list ap_copy; /* A resonable starting value. */ size = strlen (fmt) + 1; buffer = (char *)xmalloc (size); - nchars = vsnprintf (buffer, size, fmt, ap); - - /* From the GNU Libc manual: In versions of the GNU C library prior - to 2.1 the return value is the number of characters stored, not - including the terminating null; unless there was not enough space - in S to store the result in which case `-1' is returned. */ - if (nchars == -1) - { - do - { - size *= 2; - buffer = (char *)xrealloc (buffer, size); - } while (vsnprintf (buffer, size, fmt, ap) == -1); - } - else if (nchars >= size) + while (1) { - buffer = (char *)xrealloc (buffer, nchars + 1); - vsnprintf (buffer, nchars + 1, fmt, ap); +#if defined(va_copy) + va_copy (ap_copy, ap); +#elif defined(__va_copy) + __va_copy (ap_copy, ap); +#else + /* If there is no copy macro then this MAY work. On some systems + this could fail because va_list is a pointer so assigning one + to the other as below wouldn't make a copy of the data, but + just the pointer to the data. */ + ap_copy = ap; +#endif + nchars = vsnprintf (buffer, size, fmt, ap_copy); +#if defined(va_copy) || defined(__va_copy) + va_end (ap_copy); +#endif + + if (nchars > -1 && nchars < size) + return buffer; + else if (nchars > -1) + size = nchars + 1; + else + size *= 2; + + /* Resize the buffer and try again. */ + buffer = (char *)xrealloc (buffer, size); } - return buffer; + /* Never gets here. */ + return NULL; } /* Return a new string based on fmt. */ |