projects / uclibc-ng.git / blame
| Commit | Line | Data |
|---|---|---|
| 082e680b MNI |
1 | /* Copyright (C) 2004 Manuel Novoa III <[email protected]> |
| 2 | * | |
| 3 | * GNU Library General Public License (LGPL) version 2 or later. | |
| 4 | * | |
| 5 | * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details. | |
| 6 | */ | |
| 7 | ||
| 8 | #include "_stdio.h" | |
| 9 | #include <stdarg.h> | |
| 371ca787 | 10 | #include <bits/uClibc_va_copy.h> |
| 082e680b MNI |
11 | |
| 12 | #ifdef __UCLIBC_MJN3_ONLY__ | |
| 13 | /* Do the memstream stuff inline to avoid fclose and the openlist? */ | |
| 14 | #warning CONSIDER: avoid open_memstream call? | |
| 15 | #endif | |
| 16 | ||
| 17 | #ifndef __STDIO_HAS_VSNPRINTF | |
| 18 | #warning Skipping vasprintf since no vsnprintf! | |
| 19 | #else | |
| 20 | ||
| 21 | int vasprintf(char **__restrict buf, const char * __restrict format, | |
| 22 | va_list arg) | |
| 23 | { | |
| 24 | #ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__ | |
| 25 | ||
| 26 | FILE *f; | |
| 27 | size_t size; | |
| 28 | int rv = -1; | |
| 29 | ||
| 30 | *buf = NULL; | |
| 31 | ||
| 32 | if ((f = open_memstream(buf, &size)) != NULL) { | |
| 33 | rv = vfprintf(f, format, arg); | |
| 34 | fclose(f); | |
| 35 | if (rv < 0) { | |
| 36 | free(*buf); | |
| 37 | *buf = NULL; | |
| 38 | } | |
| 39 | } | |
| 40 | ||
| 41 | assert(rv >= -1); | |
| 42 | ||
| 43 | return rv; | |
| 44 | ||
| 45 | #else /* __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__ */ | |
| 46 | ||
| 47 | /* This implementation actually calls the printf machinery twice, but only | |
| 48 | * only does one malloc. This can be a problem though when custom printf | |
| 49 | * specs or the %m specifier are involved because the results of the | |
| 50 | * second call might be different from the first. */ | |
| 51 | va_list arg2; | |
| 52 | int rv; | |
| 53 | ||
| 54 | va_copy(arg2, arg); | |
| 55 | rv = vsnprintf(NULL, 0, format, arg2); | |
| 56 | va_end(arg2); | |
| 57 | ||
| 58 | *buf = NULL; | |
| 59 | ||
| 60 | if (rv >= 0) { | |
| 61 | if ((*buf = malloc(++rv)) != NULL) { | |
| 62 | if ((rv = vsnprintf(*buf, rv, format, arg)) < 0) { | |
| 63 | free(*buf); | |
| 64 | *buf = NULL; | |
| 65 | } | |
| 66 | } | |
| 67 | } | |
| 68 | ||
| 69 | assert(rv >= -1); | |
| 70 | ||
| 71 | return rv; | |
| 72 | ||
| 73 | #endif /* __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__ */ | |
| 74 | } | |
| 75 | ||
| 76 | #endif |