ref: 75d6267a5f788162d92e7a5ae126cd8b0770aa8a
dir: /sys/src/libc/fmt/runevsmprint.c/
#include <u.h> #include <libc.h> #include "fmtdef.h" static int runeFmtStrFlush(Fmt *f) { Rune *s; int n; if(f->start == nil) return 0; n = (int)(uintptr)f->farg; n *= 2; s = f->start; f->start = realloc(s, sizeof(Rune)*n); if(f->start == nil){ f->farg = nil; f->to = nil; f->stop = nil; free(s); return 0; } f->farg = (void*)n; f->to = (Rune*)f->start + ((Rune*)f->to - s); f->stop = (Rune*)f->start + n - 1; return 1; } int runefmtstrinit(Fmt *f) { int n; memset(f, 0, sizeof *f); f->runes = 1; n = 32; f->start = malloc(sizeof(Rune)*n); if(f->start == nil) return -1; f->to = f->start; f->stop = (Rune*)f->start + n - 1; f->flush = runeFmtStrFlush; f->farg = (void*)n; f->nfmt = 0; return 0; } /* * print into an allocated string buffer */ Rune* runevsmprint(char *fmt, va_list args) { Fmt f; int n; if(runefmtstrinit(&f) < 0) return nil; f.args = args; n = dofmt(&f, fmt); if(f.start == nil) return nil; if(n < 0){ free(f.start); return nil; } *(Rune*)f.to = '\0'; return f.start; }