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87 lines
1.8 KiB
87 lines
1.8 KiB
3 months ago
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/*
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* UCW Library -- A simple growing buffers for byte-sized items
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*
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* (c) 2006 Pavel Charvat <pchar@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/bbuf.h>
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#include <stdio.h>
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char *
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bb_vprintf_at(bb_t *bb, size_t ofs, const char *fmt, va_list args)
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{
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bb_grow(bb, ofs + 1);
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va_list args2;
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va_copy(args2, args);
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int cnt = vsnprintf(bb->ptr + ofs, bb->len - ofs, fmt, args2);
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va_end(args2);
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if (cnt < 0)
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{
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/* Our C library doesn't support C99 return value of vsnprintf, so we need to iterate */
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do
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{
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bb_do_grow(bb, bb->len + 1);
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va_copy(args2, args);
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cnt = vsnprintf(bb->ptr + ofs, bb->len - ofs, fmt, args2);
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va_end(args2);
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}
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while (cnt < 0);
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}
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else if ((uint)cnt >= bb->len - ofs)
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{
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bb_do_grow(bb, ofs + cnt + 1);
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va_copy(args2, args);
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int cnt2 = vsnprintf(bb->ptr + ofs, bb->len - ofs, fmt, args2);
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va_end(args2);
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ASSERT(cnt2 == cnt);
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}
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return bb->ptr + ofs;
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}
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char *
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bb_printf_at(bb_t *bb, size_t ofs, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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char *res = bb_vprintf_at(bb, ofs, fmt, args);
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va_end(args);
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return res;
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}
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char *
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bb_vprintf(bb_t *bb, const char *fmt, va_list args)
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{
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return bb_vprintf_at(bb, 0, fmt, args);
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}
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char *
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bb_printf(bb_t *bb, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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char *res = bb_vprintf_at(bb, 0, fmt, args);
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va_end(args);
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return res;
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}
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#ifdef TEST
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int main(void)
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{
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bb_t bb;
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bb_init(&bb);
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char *x = bb_printf(&bb, "<Hello, %s!>", "World");
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fputs(x, stdout);
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x = bb_printf_at(&bb, 5, "<Hello, %50s!>\n", "World");
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fputs(x, stdout);
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bb_done(&bb);
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return 0;
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}
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#endif
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