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100 lines
2.1 KiB
100 lines
2.1 KiB
2 months ago
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/*
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* UCW Library -- Memory Pools (Formatting)
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*
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* (c) 2005 Martin Mares <mj@ucw.cz>
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* (c) 2007 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/mempool.h>
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#include <alloca.h>
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#include <stdio.h>
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#include <string.h>
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static char *
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mp_vprintf_at(struct mempool *mp, size_t ofs, const char *fmt, va_list args)
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{
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char *ret = mp_grow(mp, ofs + 1) + ofs;
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va_list args2;
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va_copy(args2, args);
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int cnt = vsnprintf(ret, mp_avail(mp) - 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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ret = mp_expand(mp) + ofs;
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va_copy(args2, args);
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cnt = vsnprintf(ret, mp_avail(mp) - 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 >= mp_avail(mp) - ofs)
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{
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ret = mp_grow(mp, ofs + cnt + 1) + ofs;
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va_copy(args2, args);
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int cnt2 = vsnprintf(ret, cnt + 1, fmt, args2);
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va_end(args2);
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ASSERT(cnt2 == cnt);
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}
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mp_end(mp, ret + cnt + 1);
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return ret - ofs;
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}
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char *
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mp_vprintf(struct mempool *mp, const char *fmt, va_list args)
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{
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mp_start(mp, 1);
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return mp_vprintf_at(mp, 0, fmt, args);
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}
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char *
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mp_printf(struct mempool *p, 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 = mp_vprintf(p, 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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mp_vprintf_append(struct mempool *mp, char *ptr, const char *fmt, va_list args)
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{
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size_t ofs = mp_open(mp, ptr);
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ASSERT(ofs && !ptr[ofs - 1]);
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return mp_vprintf_at(mp, ofs - 1, fmt, args);
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}
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char *
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mp_printf_append(struct mempool *mp, char *ptr, 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 = mp_vprintf_append(mp, ptr, 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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struct mempool *mp = mp_new(64);
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char *x = mp_printf(mp, "<Hello, %s!>", "World");
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fputs(x, stdout);
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x = mp_printf_append(mp, x, "<Appended>");
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fputs(x, stdout);
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x = mp_printf(mp, "<Hello, %50s!>\n", "World");
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fputs(x, stdout);
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return 0;
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}
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#endif
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