ref: 1018d7a7091fd5e0433f501a3474cdc3fec322cc
dir: /lib9/vsmprint.c/
/* * The authors of this software are Rob Pike and Ken Thompson. * Copyright (c) 2002 by Lucent Technologies. * Permission to use, copy, modify, and distribute this software for any * purpose without fee is hereby granted, provided that this entire notice * is included in all copies of any software which is or includes a copy * or modification of this software and in all copies of the supporting * documentation for such software. * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */ #include "lib9.h" #include "fmtdef.h" static int fmtStrFlush(Fmt *f) { char *s; int n; if(f->start == nil) return 0; n = (int)f->farg; n += 256; f->farg = (void*)n; s = f->start; f->start = realloc(s, n); if(f->start == nil){ free(s); f->to = nil; f->stop = nil; return 0; } f->to = (char*)f->start + ((char*)f->to - s); f->stop = (char*)f->start + n - 1; return 1; } int fmtstrinit(Fmt *f) { int n; memset(f, 0, sizeof(*f)); n = 32; f->start = malloc(n); if(f->start == nil) return -1; f->to = f->start; f->stop = (char*)f->start + n - 1; f->flush = fmtStrFlush; f->farg = (void*)n; f->nfmt = 0; return 0; } /* * print into an allocated string buffer */ char* vsmprint(char *fmt, va_list args) { Fmt f; int n; if(fmtstrinit(&f) < 0) return nil; va_copy(f.args, args); n = dofmt(&f, fmt); va_end(f.args); if(n < 0){ free(f.start); f.start = nil; return nil; } return fmtstrflush(&f); }