1 | /* Concatenate variable number of strings. |
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2 | Copyright (C) 1991, 1994, 2001, 2011 Free Software Foundation, Inc. |
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3 | Written by Fred Fish @ Cygnus Support |
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4 | |
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5 | This file is part of the libiberty library. |
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6 | Libiberty is free software; you can redistribute it and/or |
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7 | modify it under the terms of the GNU Library General Public |
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8 | License as published by the Free Software Foundation; either |
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9 | version 2 of the License, or (at your option) any later version. |
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10 | |
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11 | Libiberty 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 GNU |
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14 | Library 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 Library General Public |
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17 | License along with libiberty; see the file COPYING.LIB. If |
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18 | not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
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19 | Boston, MA 02110-1301, USA. */ |
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20 | |
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21 | |
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22 | /* |
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23 | |
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24 | @deftypefn Extension char* concat (const char *@var{s1}, const char *@var{s2}, @ |
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25 | @dots{}, @code{NULL}) |
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26 | |
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27 | Concatenate zero or more of strings and return the result in freshly |
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28 | @code{xmalloc}ed memory. Returns @code{NULL} if insufficient memory is |
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29 | available. The argument list is terminated by the first @code{NULL} |
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30 | pointer encountered. Pointers to empty strings are ignored. |
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31 | |
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32 | @end deftypefn |
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33 | |
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34 | NOTES |
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35 | |
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36 | This function uses xmalloc() which is expected to be a front end |
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37 | function to malloc() that deals with low memory situations. In |
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38 | typical use, if malloc() returns NULL then xmalloc() diverts to an |
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39 | error handler routine which never returns, and thus xmalloc will |
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40 | never return a NULL pointer. If the client application wishes to |
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41 | deal with low memory situations itself, it should supply an xmalloc |
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42 | that just directly invokes malloc and blindly returns whatever |
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43 | malloc returns. |
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44 | |
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45 | */ |
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46 | |
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47 | |
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48 | #ifdef HAVE_CONFIG_H |
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49 | #include "config.h" |
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50 | #endif |
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51 | #include "ansidecl.h" |
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52 | #include "libiberty.h" |
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53 | #include <sys/types.h> /* size_t */ |
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54 | |
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55 | #include <stdarg.h> |
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56 | |
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57 | # if HAVE_STRING_H |
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58 | # include <string.h> |
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59 | # else |
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60 | # if HAVE_STRINGS_H |
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61 | # include <strings.h> |
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62 | # endif |
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63 | # endif |
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64 | |
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65 | #if HAVE_STDLIB_H |
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66 | #include <stdlib.h> |
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67 | #endif |
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68 | |
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69 | static inline unsigned long vconcat_length (const char *, va_list); |
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70 | static inline unsigned long |
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71 | vconcat_length (const char *first, va_list args) |
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72 | { |
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73 | unsigned long length = 0; |
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74 | const char *arg; |
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75 | |
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76 | for (arg = first; arg ; arg = va_arg (args, const char *)) |
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77 | length += strlen (arg); |
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78 | |
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79 | return length; |
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80 | } |
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81 | |
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82 | static inline char * |
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83 | vconcat_copy (char *dst, const char *first, va_list args) |
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84 | { |
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85 | char *end = dst; |
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86 | const char *arg; |
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87 | |
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88 | for (arg = first; arg ; arg = va_arg (args, const char *)) |
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89 | { |
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90 | unsigned long length = strlen (arg); |
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91 | memcpy (end, arg, length); |
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92 | end += length; |
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93 | } |
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94 | *end = '\000'; |
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95 | |
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96 | return dst; |
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97 | } |
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98 | |
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99 | /* @undocumented concat_length */ |
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100 | |
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101 | unsigned long |
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102 | concat_length (const char *first, ...) |
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103 | { |
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104 | unsigned long length; |
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105 | |
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106 | VA_OPEN (args, first); |
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107 | VA_FIXEDARG (args, const char *, first); |
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108 | length = vconcat_length (first, args); |
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109 | VA_CLOSE (args); |
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110 | |
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111 | return length; |
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112 | } |
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113 | |
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114 | /* @undocumented concat_copy */ |
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115 | |
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116 | char * |
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117 | concat_copy (char *dst, const char *first, ...) |
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118 | { |
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119 | char *save_dst; |
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120 | |
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121 | VA_OPEN (args, first); |
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122 | VA_FIXEDARG (args, char *, dst); |
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123 | VA_FIXEDARG (args, const char *, first); |
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124 | vconcat_copy (dst, first, args); |
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125 | save_dst = dst; /* With K&R C, dst goes out of scope here. */ |
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126 | VA_CLOSE (args); |
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127 | |
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128 | return save_dst; |
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129 | } |
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130 | |
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131 | #ifdef __cplusplus |
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132 | extern "C" { |
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133 | #endif /* __cplusplus */ |
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134 | char *libiberty_concat_ptr; |
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135 | #ifdef __cplusplus |
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136 | } |
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137 | #endif /* __cplusplus */ |
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138 | |
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139 | /* @undocumented concat_copy2 */ |
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140 | |
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141 | char * |
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142 | concat_copy2 (const char *first, ...) |
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143 | { |
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144 | VA_OPEN (args, first); |
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145 | VA_FIXEDARG (args, const char *, first); |
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146 | vconcat_copy (libiberty_concat_ptr, first, args); |
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147 | VA_CLOSE (args); |
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148 | |
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149 | return libiberty_concat_ptr; |
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150 | } |
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151 | |
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152 | char * |
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153 | concat (const char *first, ...) |
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154 | { |
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155 | char *newstr; |
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156 | |
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157 | /* First compute the size of the result and get sufficient memory. */ |
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158 | VA_OPEN (args, first); |
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159 | VA_FIXEDARG (args, const char *, first); |
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160 | newstr = XNEWVEC (char, vconcat_length (first, args) + 1); |
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161 | VA_CLOSE (args); |
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162 | |
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163 | /* Now copy the individual pieces to the result string. */ |
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164 | VA_OPEN (args, first); |
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165 | VA_FIXEDARG (args, const char *, first); |
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166 | vconcat_copy (newstr, first, args); |
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167 | VA_CLOSE (args); |
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168 | |
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169 | return newstr; |
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170 | } |
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171 | |
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172 | /* |
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173 | |
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174 | @deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @ |
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175 | @dots{}, @code{NULL}) |
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176 | |
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177 | Same as @code{concat}, except that if @var{optr} is not @code{NULL} it |
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178 | is freed after the string is created. This is intended to be useful |
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179 | when you're extending an existing string or building up a string in a |
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180 | loop: |
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181 | |
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182 | @example |
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183 | str = reconcat (str, "pre-", str, NULL); |
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184 | @end example |
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185 | |
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186 | @end deftypefn |
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187 | |
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188 | */ |
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189 | |
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190 | char * |
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191 | reconcat (char *optr, const char *first, ...) |
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192 | { |
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193 | char *newstr; |
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194 | |
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195 | /* First compute the size of the result and get sufficient memory. */ |
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196 | VA_OPEN (args, first); |
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197 | VA_FIXEDARG (args, char *, optr); |
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198 | VA_FIXEDARG (args, const char *, first); |
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199 | newstr = XNEWVEC (char, vconcat_length (first, args) + 1); |
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200 | VA_CLOSE (args); |
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201 | |
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202 | /* Now copy the individual pieces to the result string. */ |
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203 | VA_OPEN (args, first); |
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204 | VA_FIXEDARG (args, char *, optr); |
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205 | VA_FIXEDARG (args, const char *, first); |
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206 | vconcat_copy (newstr, first, args); |
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207 | if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C. */ |
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208 | free (optr); |
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209 | VA_CLOSE (args); |
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210 | |
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211 | return newstr; |
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212 | } |
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213 | |
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214 | #ifdef MAIN |
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215 | #define NULLP (char *)0 |
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216 | |
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217 | /* Simple little test driver. */ |
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218 | |
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219 | #include <stdio.h> |
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220 | |
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221 | int |
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222 | main (void) |
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223 | { |
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224 | printf ("\"\" = \"%s\"\n", concat (NULLP)); |
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225 | printf ("\"a\" = \"%s\"\n", concat ("a", NULLP)); |
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226 | printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP)); |
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227 | printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP)); |
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228 | printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP)); |
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229 | printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP)); |
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230 | printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP)); |
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231 | return 0; |
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232 | } |
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233 | |
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234 | #endif |
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