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annotate src/logfile.c @ 33096:828bcb1a37e7 v9.0.1833

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patch 9.0.1833: [security] runtime file fixes Commit: https://github.com/vim/vim/commit/816fbcc262687b81fc46f82f7bbeb1453addfe0c Author: Christian Brabandt <cb@256bit.org> Date: Thu Aug 31 23:52:30 2023 +0200 patch 9.0.1833: [security] runtime file fixes Problem: runtime files may execute code in current dir Solution: only execute, if not run from current directory The perl, zig and ruby filetype plugins and the zip and gzip autoload plugins may try to load malicious executable files from the current working directory. This is especially a problem on windows, where the current directory is implicitly in your $PATH and windows may even run a file with the extension `.bat` because of $PATHEXT. So make sure that we are not trying to execute a file from the current directory. If this would be the case, error out (for the zip and gzip) plugins or silently do not run those commands (for the ftplugins). This assumes, that only the current working directory is bad. For all other directories, it is assumed that those directories were intentionally set to the $PATH by the user. Signed-off-by: Christian Brabandt <cb@256bit.org>
author Christian Brabandt <cb@256bit.org>
date Fri, 01 Sep 2023 00:00:02 +0200
parents 533e36e02a68
children
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1 /* vi:set ts=8 sts=4 sw=4 noet:
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2 *
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3 * VIM - Vi IMproved by Bram Moolenaar
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4 *
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5 * Do ":help uganda" in Vim to read copying and usage conditions.
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6 * Do ":help credits" in Vim to see a list of people who contributed.
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7 */
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8
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9 /*
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10 * Implements logging. Originally intended for the channel feature, which is
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11 * why the "ch_" prefix is used. Also useful for any kind of low-level and
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12 * async debugging.
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13 */
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14
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15 #include "vim.h"
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16
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17 #if defined(FEAT_EVAL) || defined(PROTO)
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18
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19 // Log file opened with ch_logfile().
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20 static FILE *log_fd = NULL;
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21 static char_u *log_name = NULL;
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22 #ifdef FEAT_RELTIME
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23 static proftime_T log_start;
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24 #endif
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25
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26 void
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27 ch_logfile(char_u *fname, char_u *opt)
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28 {
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29 FILE *file = NULL;
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30 char *mode = "a";
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31
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32 if (log_fd != NULL)
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33 {
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34 if (*fname != NUL)
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35 ch_log(NULL, "closing this logfile, opening %s", fname);
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36 else
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37 ch_log(NULL, "closing logfile %s", log_name);
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38 fclose(log_fd);
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39 }
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40
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41 // The "a" flag overrules the "w" flag.
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42 if (vim_strchr(opt, 'a') == NULL && vim_strchr(opt, 'w') != NULL)
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43 mode = "w";
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44 ch_log_output = vim_strchr(opt, 'o') != NULL ? LOG_ALWAYS : FALSE;
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45
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46 if (*fname != NUL)
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47 {
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48 file = fopen((char *)fname, mode);
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49 if (file == NULL)
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50 {
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51 semsg(_(e_cant_open_file_str), fname);
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52 return;
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53 }
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54 vim_free(log_name);
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55 log_name = vim_strsave(fname);
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56 }
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57 log_fd = file;
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58
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59 if (log_fd != NULL)
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60 {
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61 fprintf(log_fd, "==== start log session %s ====\n",
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62 get_ctime(time(NULL), FALSE));
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63 // flush now, if fork/exec follows it could be written twice
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64 fflush(log_fd);
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65 #ifdef FEAT_RELTIME
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66 profile_start(&log_start);
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67 #endif
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68 }
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69 }
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70
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71 int
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72 ch_log_active(void)
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73 {
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74 return log_fd != NULL;
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75 }
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76
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77 static void
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78 ch_log_lead(const char *what, channel_T *ch UNUSED, ch_part_T part UNUSED)
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79 {
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80 if (log_fd == NULL)
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81 return;
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82
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83 #ifdef FEAT_RELTIME
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84 proftime_T log_now;
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85
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86 profile_start(&log_now);
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87 profile_sub(&log_now, &log_start);
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88 fprintf(log_fd, "%s ", profile_msg(&log_now));
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89 #endif
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90 #ifdef FEAT_JOB_CHANNEL
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91 if (ch != NULL)
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92 {
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93 if (part < PART_COUNT)
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94 fprintf(log_fd, "%son %d(%s): ", what, ch->ch_id, ch_part_names[part]);
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95 else
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96 fprintf(log_fd, "%son %d: ", what, ch->ch_id);
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97 }
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98 else
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99 #endif
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100 fprintf(log_fd, "%s: ", what);
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101 }
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102
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103 #ifndef PROTO // prototype is in proto.h
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104 void
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105 ch_log(channel_T *ch, const char *fmt, ...)
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106 {
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107 if (log_fd == NULL)
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108 return;
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109
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110 va_list ap;
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111
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112 ch_log_lead("", ch, PART_COUNT);
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113 va_start(ap, fmt);
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114 vfprintf(log_fd, fmt, ap);
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115 va_end(ap);
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116 fputc('\n', log_fd);
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117 fflush(log_fd);
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118 did_repeated_msg = 0;
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119 }
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120
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121 void
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122 ch_error(channel_T *ch, const char *fmt, ...)
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123 {
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124 if (log_fd == NULL)
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125 return;
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126
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127 va_list ap;
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128
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129 ch_log_lead("ERR ", ch, PART_COUNT);
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130 va_start(ap, fmt);
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131 vfprintf(log_fd, fmt, ap);
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132 va_end(ap);
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133 fputc('\n', log_fd);
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134 fflush(log_fd);
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135 did_repeated_msg = 0;
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136 }
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137 #endif
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138
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139 #if defined(FEAT_JOB_CHANNEL) || defined(PROTO)
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140 /*
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141 * Log a message "buf[len]" for channel "ch" part "part".
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142 * Only to be called when ch_log_active() returns TRUE.
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143 */
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144 void
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145 ch_log_literal(
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146 char *lead,
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147 channel_T *ch,
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148 ch_part_T part,
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149 char_u *buf,
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150 int len)
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151 {
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152 ch_log_lead(lead, ch, part);
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153 fprintf(log_fd, "'");
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154 vim_ignored = (int)fwrite(buf, len, 1, log_fd);
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155 fprintf(log_fd, "'\n");
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156 fflush(log_fd);
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157 }
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158 #endif
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159
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160 /*
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161 * "ch_log()" function
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162 */
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163 void
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164 f_ch_log(typval_T *argvars, typval_T *rettv UNUSED)
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165 {
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166 char_u *msg;
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167 channel_T *channel = NULL;
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168
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169 if (in_vim9script()
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170 && (check_for_string_arg(argvars, 0) == FAIL
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171 || check_for_opt_chan_or_job_arg(argvars, 1) == FAIL))
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172 return;
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173
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174 msg = tv_get_string(&argvars[0]);
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175 #if defined(FEAT_JOB_CHANNEL)
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176 if (argvars[1].v_type != VAR_UNKNOWN)
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177 channel = get_channel_arg(&argvars[1], FALSE, FALSE, 0);
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178 #endif
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179
31291
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180 // Prepend "ch_log()" to make it easier to find these entries in the
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181 // logfile.
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182 ch_log(channel, "ch_log(): %s", msg);
31287
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183 }
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184
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185 /*
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186 * "ch_logfile()" function
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187 */
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188 void
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189 f_ch_logfile(typval_T *argvars, typval_T *rettv UNUSED)
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190 {
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191 char_u *fname;
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192 char_u *opt = (char_u *)"";
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193 char_u buf[NUMBUFLEN];
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194
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195 // Don't open a file in restricted mode.
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196 if (check_restricted() || check_secure())
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197 return;
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198
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199 if (in_vim9script()
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200 && (check_for_string_arg(argvars, 0) == FAIL
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201 || check_for_opt_string_arg(argvars, 1) == FAIL))
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202 return;
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203
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204 fname = tv_get_string(&argvars[0]);
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205 if (argvars[1].v_type == VAR_STRING)
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206 opt = tv_get_string_buf(&argvars[1], buf);
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207 ch_logfile(fname, opt);
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208 }
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209
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210 #endif // FEAT_EVAL