ref: af5fa79bc7dfb38c654fd591c4c9d02aad386494
dir: /libc/vsmprint.c/
#include <u.h> #include <libc.h> #include "fmtdef.h" static int fmtStrFlush(Fmt *f) { char *s; int n; if(f->start == nil) return 0; n = (uintptr)f->farg; n *= 2; s = (char*)f->start; f->start = realloc(s, n); if(f->start == nil){ f->farg = nil; f->to = nil; f->stop = nil; free(s); return 0; } f->farg = (void*)(uintptr)n; 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); f->runes = 0; 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*)(uintptr)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); return nil; } return fmtstrflush(&f); }