1 | /* inputting files to be patched */ |
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2 | |
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3 | /* $Id: inp.c,v 1.1.1.2 1998-02-12 21:43:14 ghudson Exp $ */ |
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4 | |
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5 | /* |
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6 | Copyright 1986, 1988 Larry Wall |
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7 | Copyright 1991, 1992, 1993, 1997 Free Software Foundation, Inc. |
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8 | |
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9 | This program is free software; you can redistribute it and/or modify |
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10 | it under the terms of the GNU General Public License as published by |
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11 | the Free Software Foundation; either version 2, or (at your option) |
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12 | any later version. |
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13 | |
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14 | This program is distributed in the hope that it will be useful, |
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15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | GNU General Public License for more details. |
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18 | |
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19 | You should have received a copy of the GNU General Public License |
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20 | along with this program; see the file COPYING. |
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21 | If not, write to the Free Software Foundation, |
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22 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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23 | */ |
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24 | |
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25 | #define XTERN extern |
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26 | #include <common.h> |
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27 | #include <backupfile.h> |
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28 | #include <pch.h> |
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29 | #include <util.h> |
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30 | #undef XTERN |
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31 | #define XTERN |
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32 | #include <inp.h> |
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33 | |
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34 | /* Input-file-with-indexable-lines abstract type */ |
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35 | |
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36 | static char *i_buffer; /* plan A buffer */ |
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37 | static char const **i_ptr; /* pointers to lines in plan A buffer */ |
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38 | |
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39 | static size_t tibufsize; /* size of plan b buffers */ |
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40 | #ifndef TIBUFSIZE_MINIMUM |
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41 | #define TIBUFSIZE_MINIMUM (8 * 1024) /* minimum value for tibufsize */ |
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42 | #endif |
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43 | static int tifd = -1; /* plan b virtual string array */ |
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44 | static char *tibuf[2]; /* plan b buffers */ |
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45 | static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ |
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46 | static LINENUM lines_per_buf; /* how many lines per buffer */ |
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47 | static size_t tireclen; /* length of records in tmp file */ |
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48 | static size_t last_line_size; /* size of last input line */ |
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49 | |
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50 | static bool plan_a PARAMS ((char const *));/* yield FALSE if memory runs out */ |
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51 | static void plan_b PARAMS ((char const *)); |
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52 | static void report_revision PARAMS ((int)); |
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53 | static void too_many_lines PARAMS ((char const *)) __attribute__((noreturn)); |
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54 | |
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55 | /* New patch--prepare to edit another file. */ |
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56 | |
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57 | void |
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58 | re_input() |
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59 | { |
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60 | if (using_plan_a) { |
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61 | free (i_buffer); |
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62 | free (i_ptr); |
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63 | } |
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64 | else { |
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65 | close (tifd); |
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66 | tifd = -1; |
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67 | free(tibuf[0]); |
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68 | tibuf[0] = 0; |
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69 | tiline[0] = tiline[1] = -1; |
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70 | tireclen = 0; |
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71 | } |
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72 | } |
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73 | |
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74 | /* Construct the line index, somehow or other. */ |
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75 | |
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76 | void |
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77 | scan_input(filename) |
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78 | char *filename; |
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79 | { |
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80 | using_plan_a = ! (debug & 16) && plan_a (filename); |
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81 | if (!using_plan_a) |
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82 | plan_b(filename); |
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83 | switch (verbosity) |
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84 | { |
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85 | case SILENT: |
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86 | break; |
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87 | |
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88 | case VERBOSE: |
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89 | say ("Patching file `%s' using Plan %s...\n", |
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90 | filename, using_plan_a ? "A" : "B"); |
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91 | break; |
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92 | |
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93 | case DEFAULT_VERBOSITY: |
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94 | say ("patching file `%s'\n", filename); |
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95 | break; |
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96 | } |
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97 | } |
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98 | |
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99 | /* Report whether a desired revision was found. */ |
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100 | |
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101 | static void |
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102 | report_revision (found_revision) |
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103 | int found_revision; |
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104 | { |
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105 | if (found_revision) |
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106 | { |
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107 | if (verbosity == VERBOSE) |
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108 | say ("Good. This file appears to be the %s version.\n", revision); |
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109 | } |
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110 | else if (force) |
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111 | { |
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112 | if (verbosity != SILENT) |
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113 | say ("Warning: this file doesn't appear to be the %s version -- patching anyway.\n", |
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114 | revision); |
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115 | } |
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116 | else if (batch) |
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117 | { |
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118 | fatal ("This file doesn't appear to be the %s version -- aborting.", |
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119 | revision); |
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120 | } |
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121 | else |
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122 | { |
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123 | ask ("This file doesn't appear to be the %s version -- patch anyway? [n] ", |
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124 | revision); |
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125 | if (*buf != 'y') |
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126 | fatal ("aborted"); |
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127 | } |
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128 | } |
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129 | |
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130 | |
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131 | static void |
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132 | too_many_lines (filename) |
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133 | char const *filename; |
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134 | { |
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135 | fatal ("File `%s' has too many lines.", filename); |
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136 | } |
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137 | |
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138 | |
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139 | void |
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140 | get_input_file (filename, outname) |
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141 | char const *filename; |
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142 | char const *outname; |
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143 | { |
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144 | int elsewhere = strcmp (filename, outname); |
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145 | char const *cs; |
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146 | char *diffbuf; |
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147 | char *getbuf; |
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148 | |
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149 | if (inerrno == -1) |
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150 | inerrno = stat (inname, &instat) == 0 ? 0 : errno; |
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151 | |
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152 | /* Perhaps look for RCS or SCCS versions. */ |
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153 | if (patch_get |
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154 | && invc != 0 |
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155 | && (inerrno |
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156 | || (! elsewhere |
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157 | && (/* No one can write to it. */ |
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158 | (instat.st_mode & (S_IWUSR|S_IWGRP|S_IWOTH)) == 0 |
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159 | /* Only the owner (who's not me) can write to it. */ |
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160 | || ((instat.st_mode & (S_IWGRP|S_IWOTH)) == 0 |
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161 | && instat.st_uid != geteuid ())))) |
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162 | && (invc = !! (cs = (version_controller |
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163 | (filename, elsewhere, |
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164 | inerrno ? (struct stat *) 0 : &instat, |
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165 | &getbuf, &diffbuf))))) { |
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166 | |
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167 | if (!inerrno) { |
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168 | if (!elsewhere |
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169 | && (instat.st_mode & (S_IWUSR|S_IWGRP|S_IWOTH)) != 0) |
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170 | /* Somebody can write to it. */ |
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171 | fatal ("file `%s' seems to be locked by somebody else under %s", |
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172 | filename, cs); |
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173 | /* It might be checked out unlocked. See if it's safe to |
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174 | check out the default version locked. */ |
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175 | if (verbosity == VERBOSE) |
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176 | say ("Comparing file `%s' to default %s version...\n", |
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177 | filename, cs); |
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178 | if (systemic (diffbuf) != 0) |
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179 | { |
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180 | say ("warning: patching file `%s', which does not match default %s version\n", |
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181 | filename, cs); |
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182 | cs = 0; |
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183 | } |
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184 | } |
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185 | |
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186 | if (cs && version_get (filename, cs, ! inerrno, elsewhere, getbuf, |
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187 | &instat)) |
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188 | inerrno = 0; |
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189 | |
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190 | free (getbuf); |
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191 | free (diffbuf); |
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192 | |
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193 | } else if (inerrno && !pch_says_nonexistent (reverse)) |
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194 | { |
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195 | errno = inerrno; |
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196 | pfatal ("can't find file `%s'", filename); |
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197 | } |
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198 | |
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199 | if (inerrno) |
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200 | { |
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201 | instat.st_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; |
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202 | instat.st_size = 0; |
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203 | } |
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204 | else if (! S_ISREG (instat.st_mode)) |
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205 | fatal ("`%s' is not a regular file -- can't patch", filename); |
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206 | } |
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207 | |
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208 | |
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209 | /* Try keeping everything in memory. */ |
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210 | |
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211 | static bool |
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212 | plan_a(filename) |
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213 | char const *filename; |
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214 | { |
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215 | register char const *s; |
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216 | register char const *lim; |
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217 | register char const **ptr; |
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218 | register char *buffer; |
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219 | register LINENUM iline; |
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220 | size_t size = instat.st_size; |
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221 | |
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222 | /* Fail if the file size doesn't fit in a size_t, |
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223 | or if storage isn't available. */ |
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224 | if (! (size == instat.st_size |
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225 | && (buffer = malloc (size ? size : (size_t) 1)))) |
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226 | return FALSE; |
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227 | |
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228 | /* Read the input file, but don't bother reading it if it's empty. |
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229 | When creating files, the files do not actually exist. */ |
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230 | if (size) |
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231 | { |
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232 | int ifd = open (filename, O_RDONLY|binary_transput); |
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233 | size_t buffered = 0, n; |
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234 | if (ifd < 0) |
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235 | pfatal ("can't open file `%s'", filename); |
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236 | |
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237 | while (size - buffered != 0) |
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238 | { |
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239 | n = read (ifd, buffer + buffered, size - buffered); |
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240 | if (n == 0) |
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241 | { |
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242 | /* Some non-POSIX hosts exaggerate st_size in text mode; |
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243 | or the file may have shrunk! */ |
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244 | size = buffered; |
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245 | break; |
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246 | } |
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247 | if (n == (size_t) -1) |
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248 | { |
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249 | /* Perhaps size is too large for this host. */ |
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250 | close (ifd); |
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251 | free (buffer); |
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252 | return FALSE; |
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253 | } |
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254 | buffered += n; |
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255 | } |
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256 | |
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257 | if (close (ifd) != 0) |
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258 | read_fatal (); |
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259 | } |
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260 | |
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261 | /* Scan the buffer and build array of pointers to lines. */ |
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262 | lim = buffer + size; |
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263 | iline = 3; /* 1 unused, 1 for SOF, 1 for EOF if last line is incomplete */ |
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264 | for (s = buffer; (s = (char *) memchr (s, '\n', lim - s)); s++) |
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265 | if (++iline < 0) |
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266 | too_many_lines (filename); |
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267 | if (! (iline == (size_t) iline |
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268 | && (size_t) iline * sizeof *ptr / sizeof *ptr == (size_t) iline |
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269 | && (ptr = (char const **) malloc ((size_t) iline * sizeof *ptr)))) |
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270 | { |
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271 | free (buffer); |
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272 | return FALSE; |
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273 | } |
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274 | iline = 0; |
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275 | for (s = buffer; ; s++) |
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276 | { |
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277 | ptr[++iline] = s; |
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278 | if (! (s = (char *) memchr (s, '\n', lim - s))) |
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279 | break; |
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280 | } |
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281 | if (size && lim[-1] != '\n') |
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282 | ptr[++iline] = lim; |
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283 | input_lines = iline - 1; |
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284 | |
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285 | if (revision) |
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286 | { |
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287 | char const *rev = revision; |
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288 | int rev0 = rev[0]; |
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289 | int found_revision = 0; |
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290 | size_t revlen = strlen (rev); |
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291 | |
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292 | if (revlen <= size) |
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293 | { |
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294 | char const *limrev = lim - revlen; |
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295 | |
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296 | for (s = buffer; (s = (char *) memchr (s, rev0, limrev - s)); s++) |
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297 | if (memcmp (s, rev, revlen) == 0 |
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298 | && (s == buffer || ISSPACE ((unsigned char) s[-1])) |
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299 | && (s + 1 == limrev || ISSPACE ((unsigned char) s[revlen]))) |
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300 | { |
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301 | found_revision = 1; |
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302 | break; |
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303 | } |
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304 | } |
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305 | |
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306 | report_revision (found_revision); |
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307 | } |
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308 | |
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309 | /* Plan A will work. */ |
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310 | i_buffer = buffer; |
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311 | i_ptr = ptr; |
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312 | return TRUE; |
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313 | } |
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314 | |
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315 | /* Keep (virtually) nothing in memory. */ |
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316 | |
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317 | static void |
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318 | plan_b(filename) |
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319 | char const *filename; |
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320 | { |
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321 | register FILE *ifp; |
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322 | register int c; |
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323 | register size_t len; |
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324 | register size_t maxlen; |
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325 | register int found_revision; |
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326 | register size_t i; |
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327 | register char const *rev; |
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328 | register size_t revlen; |
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329 | register LINENUM line = 1; |
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330 | |
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331 | if (instat.st_size == 0) |
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332 | filename = NULL_DEVICE; |
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333 | if (! (ifp = fopen (filename, binary_transput ? "rb" : "r"))) |
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334 | pfatal ("can't open file `%s'", filename); |
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335 | tifd = create_file (TMPINNAME, O_RDWR | O_BINARY, (mode_t) 0); |
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336 | i = 0; |
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337 | len = 0; |
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338 | maxlen = 1; |
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339 | rev = revision; |
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340 | found_revision = !rev; |
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341 | revlen = rev ? strlen (rev) : 0; |
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342 | |
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343 | while ((c = getc (ifp)) != EOF) |
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344 | { |
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345 | len++; |
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346 | |
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347 | if (c == '\n') |
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348 | { |
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349 | if (++line < 0) |
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350 | too_many_lines (filename); |
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351 | if (maxlen < len) |
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352 | maxlen = len; |
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353 | len = 0; |
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354 | } |
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355 | |
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356 | if (!found_revision) |
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357 | { |
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358 | if (i == revlen) |
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359 | { |
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360 | found_revision = ISSPACE ((unsigned char) c); |
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361 | i = (size_t) -1; |
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362 | } |
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363 | else if (i != (size_t) -1) |
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364 | i = rev[i]==c ? i + 1 : (size_t) -1; |
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365 | |
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366 | if (i == (size_t) -1 && ISSPACE ((unsigned char) c)) |
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367 | i = 0; |
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368 | } |
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369 | } |
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370 | |
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371 | if (revision) |
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372 | report_revision (found_revision); |
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373 | Fseek (ifp, (off_t) 0, SEEK_SET); /* rewind file */ |
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374 | for (tibufsize = TIBUFSIZE_MINIMUM; tibufsize < maxlen; tibufsize <<= 1) |
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375 | continue; |
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376 | lines_per_buf = tibufsize / maxlen; |
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377 | tireclen = maxlen; |
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378 | tibuf[0] = xmalloc (2 * tibufsize); |
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379 | tibuf[1] = tibuf[0] + tibufsize; |
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380 | |
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381 | for (line = 1; ; line++) |
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382 | { |
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383 | char *p = tibuf[0] + maxlen * (line % lines_per_buf); |
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384 | char const *p0 = p; |
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385 | if (! (line % lines_per_buf)) /* new block */ |
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386 | if (write (tifd, tibuf[0], tibufsize) != tibufsize) |
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387 | write_fatal (); |
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388 | if ((c = getc (ifp)) == EOF) |
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389 | break; |
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390 | |
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391 | for (;;) |
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392 | { |
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393 | *p++ = c; |
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394 | if (c == '\n') |
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395 | { |
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396 | last_line_size = p - p0; |
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397 | break; |
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398 | } |
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399 | |
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400 | if ((c = getc (ifp)) == EOF) |
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401 | { |
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402 | last_line_size = p - p0; |
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403 | line++; |
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404 | goto EOF_reached; |
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405 | } |
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406 | } |
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407 | } |
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408 | EOF_reached: |
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409 | if (ferror (ifp) || fclose (ifp) != 0) |
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410 | read_fatal (); |
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411 | |
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412 | if (line % lines_per_buf != 0) |
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413 | if (write (tifd, tibuf[0], tibufsize) != tibufsize) |
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414 | write_fatal (); |
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415 | input_lines = line - 1; |
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416 | } |
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417 | |
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418 | /* Fetch a line from the input file. */ |
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419 | |
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420 | char const * |
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421 | ifetch (line, whichbuf, psize) |
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422 | register LINENUM line; |
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423 | int whichbuf; /* ignored when file in memory */ |
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424 | size_t *psize; |
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425 | { |
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426 | register char const *q; |
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427 | register char const *p; |
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428 | |
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429 | if (line < 1 || line > input_lines) { |
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430 | *psize = 0; |
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431 | return ""; |
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432 | } |
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433 | if (using_plan_a) { |
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434 | p = i_ptr[line]; |
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435 | *psize = i_ptr[line + 1] - p; |
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436 | return p; |
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437 | } else { |
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438 | LINENUM offline = line % lines_per_buf; |
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439 | LINENUM baseline = line - offline; |
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440 | |
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441 | if (tiline[0] == baseline) |
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442 | whichbuf = 0; |
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443 | else if (tiline[1] == baseline) |
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444 | whichbuf = 1; |
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445 | else { |
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446 | tiline[whichbuf] = baseline; |
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447 | if (lseek (tifd, (off_t) (baseline/lines_per_buf * tibufsize), |
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448 | SEEK_SET) == -1 |
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449 | || read (tifd, tibuf[whichbuf], tibufsize) < 0) |
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450 | read_fatal (); |
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451 | } |
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452 | p = tibuf[whichbuf] + (tireclen*offline); |
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453 | if (line == input_lines) |
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454 | *psize = last_line_size; |
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455 | else { |
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456 | for (q = p; *q++ != '\n'; ) |
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457 | continue; |
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458 | *psize = q - p; |
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459 | } |
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460 | return p; |
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461 | } |
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462 | } |
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