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272
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1 /* Word-wrapping and line-truncating streams.
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2 Copyright (C) 1997, 2006-2008 Free Software Foundation, Inc.
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3 This file is part of the GNU C Library.
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4 Written by Miles Bader <miles@gnu.ai.mit.edu>.
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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18
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19 /* This package emulates glibc `line_wrap_stream' semantics for systems that
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20 don't have that. If the system does have it, it is just a wrapper for
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21 that. This header file is only used internally while compiling argp, and
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22 shouldn't be installed. */
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23
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24 #ifndef _ARGP_FMTSTREAM_H
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25 #define _ARGP_FMTSTREAM_H
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26
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27 #include <stdio.h>
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28 #include <string.h>
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29 #include <unistd.h>
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30
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31 #ifndef __attribute__
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32 /* This feature is available in gcc versions 2.5 and later. */
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33 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
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34 # define __attribute__(Spec) /* empty */
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35 # endif
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36 /* The __-protected variants of `format' and `printf' attributes
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37 are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
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38 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) || __STRICT_ANSI__
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39 # define __format__ format
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40 # define __printf__ printf
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41 # endif
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42 #endif
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43
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44 #if (_LIBC - 0 && !defined (USE_IN_LIBIO)) \
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45 || (defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H))
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46 /* line_wrap_stream is available, so use that. */
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47 #define ARGP_FMTSTREAM_USE_LINEWRAP
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48 #endif
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49
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50 #ifdef ARGP_FMTSTREAM_USE_LINEWRAP
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51 /* Just be a simple wrapper for line_wrap_stream; the semantics are
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52 *slightly* different, as line_wrap_stream doesn't actually make a new
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53 object, it just modifies the given stream (reversibly) to do
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54 line-wrapping. Since we control who uses this code, it doesn't matter. */
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55
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56 #include <linewrap.h>
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57
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58 typedef FILE *argp_fmtstream_t;
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59
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60 #define argp_make_fmtstream line_wrap_stream
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61 #define __argp_make_fmtstream line_wrap_stream
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62 #define argp_fmtstream_free line_unwrap_stream
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63 #define __argp_fmtstream_free line_unwrap_stream
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64
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65 #define __argp_fmtstream_putc(fs,ch) putc(ch,fs)
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66 #define argp_fmtstream_putc(fs,ch) putc(ch,fs)
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67 #define __argp_fmtstream_puts(fs,str) fputs(str,fs)
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68 #define argp_fmtstream_puts(fs,str) fputs(str,fs)
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69 #define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
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70 #define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
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71 #define __argp_fmtstream_printf fprintf
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72 #define argp_fmtstream_printf fprintf
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73
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74 #define __argp_fmtstream_lmargin line_wrap_lmargin
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75 #define argp_fmtstream_lmargin line_wrap_lmargin
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76 #define __argp_fmtstream_set_lmargin line_wrap_set_lmargin
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77 #define argp_fmtstream_set_lmargin line_wrap_set_lmargin
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78 #define __argp_fmtstream_rmargin line_wrap_rmargin
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79 #define argp_fmtstream_rmargin line_wrap_rmargin
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80 #define __argp_fmtstream_set_rmargin line_wrap_set_rmargin
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81 #define argp_fmtstream_set_rmargin line_wrap_set_rmargin
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82 #define __argp_fmtstream_wmargin line_wrap_wmargin
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83 #define argp_fmtstream_wmargin line_wrap_wmargin
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84 #define __argp_fmtstream_set_wmargin line_wrap_set_wmargin
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85 #define argp_fmtstream_set_wmargin line_wrap_set_wmargin
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86 #define __argp_fmtstream_point line_wrap_point
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87 #define argp_fmtstream_point line_wrap_point
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88
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89 #else /* !ARGP_FMTSTREAM_USE_LINEWRAP */
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90 /* Guess we have to define our own version. */
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91
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92 struct argp_fmtstream
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93 {
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94 FILE *stream; /* The stream we're outputting to. */
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95
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96 size_t lmargin, rmargin; /* Left and right margins. */
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97 ssize_t wmargin; /* Margin to wrap to, or -1 to truncate. */
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98
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99 /* Point in buffer to which we've processed for wrapping, but not output. */
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100 size_t point_offs;
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101 /* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin. */
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102 ssize_t point_col;
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103
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104 char *buf; /* Output buffer. */
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105 char *p; /* Current end of text in BUF. */
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106 char *end; /* Absolute end of BUF. */
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107 };
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108
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109 typedef struct argp_fmtstream *argp_fmtstream_t;
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110
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111 /* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
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112 written on it with LMARGIN spaces and limits them to RMARGIN columns
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113 total. If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
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114 replacing the whitespace before them with a newline and WMARGIN spaces.
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115 Otherwise, chars beyond RMARGIN are simply dropped until a newline.
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116 Returns NULL if there was an error. */
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117 extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,
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118 size_t __lmargin,
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119 size_t __rmargin,
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120 ssize_t __wmargin);
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121 extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,
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122 size_t __lmargin,
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123 size_t __rmargin,
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124 ssize_t __wmargin);
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125
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126 /* Flush __FS to its stream, and free it (but don't close the stream). */
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127 extern void __argp_fmtstream_free (argp_fmtstream_t __fs);
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128 extern void argp_fmtstream_free (argp_fmtstream_t __fs);
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129
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130 extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,
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131 const char *__fmt, ...)
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132 __attribute__ ((__format__ (printf, 2, 3)));
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133 extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,
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134 const char *__fmt, ...)
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135 __attribute__ ((__format__ (printf, 2, 3)));
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136
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137 #if _LIBC || !defined __OPTIMIZE__
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138 extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
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139 extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
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140
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141 extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
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142 extern int argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
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143
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144 extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,
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145 const char *__str, size_t __len);
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146 extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,
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147 const char *__str, size_t __len);
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148 #endif
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149
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150 /* Access macros for various bits of state. */
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151 #define argp_fmtstream_lmargin(__fs) ((__fs)->lmargin)
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152 #define argp_fmtstream_rmargin(__fs) ((__fs)->rmargin)
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153 #define argp_fmtstream_wmargin(__fs) ((__fs)->wmargin)
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154 #define __argp_fmtstream_lmargin argp_fmtstream_lmargin
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155 #define __argp_fmtstream_rmargin argp_fmtstream_rmargin
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156 #define __argp_fmtstream_wmargin argp_fmtstream_wmargin
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157
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158 #if _LIBC || !defined __OPTIMIZE__
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159 /* Set __FS's left margin to LMARGIN and return the old value. */
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160 extern size_t argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
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161 size_t __lmargin);
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162 extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
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163 size_t __lmargin);
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164
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165 /* Set __FS's right margin to __RMARGIN and return the old value. */
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166 extern size_t argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
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167 size_t __rmargin);
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168 extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
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169 size_t __rmargin);
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170
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171 /* Set __FS's wrap margin to __WMARGIN and return the old value. */
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172 extern size_t argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
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173 size_t __wmargin);
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174 extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
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175 size_t __wmargin);
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176
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177 /* Return the column number of the current output point in __FS. */
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178 extern size_t argp_fmtstream_point (argp_fmtstream_t __fs);
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179 extern size_t __argp_fmtstream_point (argp_fmtstream_t __fs);
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180 #endif
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181
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182 /* Internal routines. */
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183 extern void _argp_fmtstream_update (argp_fmtstream_t __fs);
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184 extern void __argp_fmtstream_update (argp_fmtstream_t __fs);
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185 extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
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186 extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
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187
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188 #ifdef __OPTIMIZE__
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189 /* Inline versions of above routines. */
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190
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191 #if !_LIBC
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192 #define __argp_fmtstream_putc argp_fmtstream_putc
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193 #define __argp_fmtstream_puts argp_fmtstream_puts
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194 #define __argp_fmtstream_write argp_fmtstream_write
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195 #define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin
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196 #define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin
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197 #define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin
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198 #define __argp_fmtstream_point argp_fmtstream_point
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199 #define __argp_fmtstream_update _argp_fmtstream_update
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200 #define __argp_fmtstream_ensure _argp_fmtstream_ensure
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201 #endif
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202
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203 #ifndef ARGP_FS_EI
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204 # ifdef __GNUC__
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205 /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
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206 inline semantics, unless -fgnu89-inline is used. It defines a macro
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207 __GNUC_STDC_INLINE__ to indicate this situation or a macro
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208 __GNUC_GNU_INLINE__ to indicate the opposite situation.
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209
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210 GCC 4.2 with -std=c99 or -std=gnu99 implements the GNU C inline
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211 semantics but warns, unless -fgnu89-inline is used:
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212 warning: C99 inline functions are not supported; using GNU89
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213 warning: to disable this warning use -fgnu89-inline or the gnu_inline function attribute
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214 It defines a macro __GNUC_GNU_INLINE__ to indicate this situation.
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215
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216 Whereas Apple GCC 4.0.1 build 5479 without -std=c99 or -std=gnu99
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217 implements the GNU C inline semantics and defines the macro
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218 __GNUC_GNU_INLINE__, but it does not warn and does not support
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219 __attribute__ ((__gnu_inline__)).
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220
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221 All in all, these are the possible combinations. For every compiler,
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222 we need to choose ARGP_FS_EI so that the corresponding table cell
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223 contains an "ok".
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224
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225 \ ARGP_FS_EI inline extern extern
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226 \ inline inline
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227 CC \ __attribute__
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228 ((gnu_inline))
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229
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230 gcc 4.3.0 error ok ok
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231 gcc 4.3.0 -std=gnu99 -fgnu89-inline error ok ok
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232 gcc 4.3.0 -std=gnu99 ok error ok
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233
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234 gcc 4.2.2 error ok ok
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235 gcc 4.2.2 -std=gnu99 -fgnu89-inline error ok ok
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236 gcc 4.2.2 -std=gnu99 error warning ok
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237
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238 gcc 4.1.2 error ok warning
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239 gcc 4.1.2 -std=gnu99 error ok warning
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240
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241 Apple gcc 4.0.1 error ok warning
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242 Apple gcc 4.0.1 -std=gnu99 ok error warning
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243 */
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244 # if defined __GNUC_STDC_INLINE__
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245 # define ARGP_FS_EI inline
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246 # elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
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247 # define ARGP_FS_EI extern inline __attribute__ ((__gnu_inline__))
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248 # else
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249 # define ARGP_FS_EI extern inline
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250 # endif
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251 # else
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252 /* With other compilers, assume the ISO C99 meaning of 'inline', if
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253 the compiler supports 'inline' at all. */
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254 # define ARGP_FS_EI inline
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255 # endif
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256 #endif
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257
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258 ARGP_FS_EI size_t
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259 __argp_fmtstream_write (argp_fmtstream_t __fs,
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260 const char *__str, size_t __len)
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261 {
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262 if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))
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263 {
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264 memcpy (__fs->p, __str, __len);
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265 __fs->p += __len;
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266 return __len;
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267 }
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268 else
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269 return 0;
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270 }
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271
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272 ARGP_FS_EI int
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273 __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str)
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274 {
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275 size_t __len = strlen (__str);
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276 if (__len)
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277 {
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278 size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);
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279 return __wrote == __len ? 0 : -1;
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280 }
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281 else
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282 return 0;
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283 }
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284
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285 ARGP_FS_EI int
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286 __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)
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287 {
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288 if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))
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289 return *__fs->p++ = __ch;
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290 else
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291 return EOF;
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292 }
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293
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294 /* Set __FS's left margin to __LMARGIN and return the old value. */
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295 ARGP_FS_EI size_t
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296 __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)
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297 {
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298 size_t __old;
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299 if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
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300 __argp_fmtstream_update (__fs);
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301 __old = __fs->lmargin;
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302 __fs->lmargin = __lmargin;
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303 return __old;
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304 }
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305
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306 /* Set __FS's right margin to __RMARGIN and return the old value. */
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307 ARGP_FS_EI size_t
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308 __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)
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309 {
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310 size_t __old;
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311 if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
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312 __argp_fmtstream_update (__fs);
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313 __old = __fs->rmargin;
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314 __fs->rmargin = __rmargin;
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315 return __old;
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316 }
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317
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318 /* Set FS's wrap margin to __WMARGIN and return the old value. */
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319 ARGP_FS_EI size_t
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320 __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)
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321 {
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322 size_t __old;
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323 if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
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324 __argp_fmtstream_update (__fs);
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325 __old = __fs->wmargin;
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326 __fs->wmargin = __wmargin;
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327 return __old;
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328 }
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329
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330 /* Return the column number of the current output point in __FS. */
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331 ARGP_FS_EI size_t
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332 __argp_fmtstream_point (argp_fmtstream_t __fs)
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333 {
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334 if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
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335 __argp_fmtstream_update (__fs);
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336 return __fs->point_col >= 0 ? __fs->point_col : 0;
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337 }
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338
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339 #if !_LIBC
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340 #undef __argp_fmtstream_putc
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341 #undef __argp_fmtstream_puts
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342 #undef __argp_fmtstream_write
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343 #undef __argp_fmtstream_set_lmargin
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344 #undef __argp_fmtstream_set_rmargin
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345 #undef __argp_fmtstream_set_wmargin
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346 #undef __argp_fmtstream_point
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347 #undef __argp_fmtstream_update
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348 #undef __argp_fmtstream_ensure
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349 #endif
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350
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351 #endif /* __OPTIMIZE__ */
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352
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353 #endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
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354
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355 #endif /* argp-fmtstream.h */
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