1 | /* Copyright (C) 2007, 2008 Eric Blake |
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2 | * Permission to use, copy, modify, and distribute this software |
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3 | * is freely granted, provided that this notice is preserved. |
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4 | */ |
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5 | /* This code was derived from asprintf.c */ |
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6 | /* doc in sprintf.c */ |
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7 | |
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8 | #include <_ansi.h> |
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9 | #include <reent.h> |
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10 | #include <stdio.h> |
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11 | #include <stdarg.h> |
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12 | #include <limits.h> |
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13 | #include <errno.h> |
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14 | #include "local.h" |
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15 | |
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16 | char * |
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17 | _asnprintf_r (struct _reent *__restrict ptr, |
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18 | char *buf, |
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19 | size_t *lenp, |
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20 | const char *__restrict fmt, ...) |
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21 | { |
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22 | int ret; |
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23 | va_list ap; |
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24 | FILE f; |
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25 | size_t len = *lenp; |
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26 | |
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27 | if (buf && len) |
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28 | { |
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29 | /* mark an existing buffer, but allow allocation of larger string */ |
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30 | f._flags = __SWR | __SSTR | __SOPT; |
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31 | } |
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32 | else |
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33 | { |
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34 | /* mark a zero-length reallocatable buffer */ |
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35 | f._flags = __SWR | __SSTR | __SMBF; |
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36 | len = 0; |
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37 | buf = NULL; |
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38 | } |
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39 | f._bf._base = f._p = (unsigned char *) buf; |
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40 | /* For now, inherit the 32-bit signed limit of FILE._bf._size. |
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41 | FIXME - it would be nice to rewrite sys/reent.h to support size_t |
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42 | for _size. */ |
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43 | if (len > INT_MAX) |
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44 | { |
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45 | ptr->_errno = EOVERFLOW; |
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46 | return NULL; |
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47 | } |
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48 | f._bf._size = f._w = len; |
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49 | f._file = -1; /* No file. */ |
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50 | va_start (ap, fmt); |
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51 | ret = _svfprintf_r (ptr, &f, fmt, ap); |
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52 | va_end (ap); |
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53 | if (ret < 0) |
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54 | return NULL; |
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55 | *lenp = ret; |
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56 | *f._p = '\0'; |
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57 | return (char *) f._bf._base; |
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58 | } |
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59 | |
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60 | #ifdef _NANO_FORMATTED_IO |
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61 | char * |
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62 | _asniprintf_r (struct _reent *, char *, size_t *, const char *, ...) |
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63 | _ATTRIBUTE ((__alias__("_asnprintf_r"))); |
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64 | #endif |
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65 | |
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66 | #ifndef _REENT_ONLY |
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67 | |
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68 | char * |
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69 | asnprintf (char *__restrict buf, |
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70 | size_t *__restrict lenp, |
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71 | const char *__restrict fmt, ...) |
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72 | { |
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73 | int ret; |
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74 | va_list ap; |
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75 | FILE f; |
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76 | size_t len = *lenp; |
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77 | struct _reent *ptr = _REENT; |
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78 | |
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79 | if (buf && len) |
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80 | { |
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81 | /* mark an existing buffer, but allow allocation of larger string */ |
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82 | f._flags = __SWR | __SSTR | __SOPT; |
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83 | } |
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84 | else |
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85 | { |
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86 | /* mark a zero-length reallocatable buffer */ |
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87 | f._flags = __SWR | __SSTR | __SMBF; |
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88 | len = 0; |
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89 | buf = NULL; |
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90 | } |
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91 | f._bf._base = f._p = (unsigned char *) buf; |
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92 | /* For now, inherit the 32-bit signed limit of FILE._bf._size. |
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93 | FIXME - it would be nice to rewrite sys/reent.h to support size_t |
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94 | for _size. */ |
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95 | if (len > INT_MAX) |
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96 | { |
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97 | ptr->_errno = EOVERFLOW; |
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98 | return NULL; |
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99 | } |
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100 | f._bf._size = f._w = len; |
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101 | f._file = -1; /* No file. */ |
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102 | va_start (ap, fmt); |
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103 | ret = _svfprintf_r (ptr, &f, fmt, ap); |
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104 | va_end (ap); |
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105 | if (ret < 0) |
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106 | return NULL; |
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107 | *lenp = ret; |
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108 | *f._p = '\0'; |
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109 | return (char *) f._bf._base; |
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110 | } |
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111 | |
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112 | #ifdef _NANO_FORMATTED_IO |
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113 | char * |
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114 | asniprintf (char *, size_t *, const char *, ...) |
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115 | _ATTRIBUTE ((__alias__("asnprintf"))); |
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116 | #endif |
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117 | #endif /* ! _REENT_ONLY */ |
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