Mercurial > cpython-lru_cache-weakref

annotate Parser/myreadline.c @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents d2c995ec4290
children 6c060bc3bf3d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Readline interface for tokenizer.c and [raw_]input() in bltinmodule.c.
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33 By default, or when stdin is not a tty device, we have a super
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34 simple my_readline function using fgets.
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35 Optionally, we can use the GNU readline library.
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36 my_readline() has a different return value from GNU readline():
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37 - NULL if an interrupt occurred or if an error occurred
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38 - a malloc'ed empty string if EOF was read
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39 - a malloc'ed string ending in \n normally
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40 */
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41
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42 #define Py_USE_NEW_NAMES 1
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43
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44 #include "config.h"
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45
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46 #include <stdio.h>
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47 #include <string.h>
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48 #include <errno.h>
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49
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50 #include "myproto.h"
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51 #include "mymalloc.h"
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52 #include "intrcheck.h"
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53
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54
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55 #ifdef WITH_READLINE
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56
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57 extern char *readline();
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58 extern int rl_initialize();
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59 extern int rl_insert();
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60 extern int rl_bind_key();
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61 extern void add_history();
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62 extern char *rl_readline_name;
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63
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64 #include <setjmp.h>
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65 #include <signal.h>
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66
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67 static jmp_buf jbuf;
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68
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69 /* ARGSUSED */
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70 static RETSIGTYPE
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71 onintr(sig)
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72 int sig;
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73 {
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74 longjmp(jbuf, 1);
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75 }
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76
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77 void
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78 PyOS_ReadlineInit()
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79 {
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80 static int been_here;
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81 if (!been_here) {
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82 /* Force rebind of TAB to insert-tab */
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83 rl_readline_name = "python";
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84 rl_initialize();
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85 rl_bind_key('\t', rl_insert);
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86 been_here++;
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87 }
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88 }
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89
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90 char *
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91 PyOS_GnuReadline(prompt)
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92 char *prompt;
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93 {
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94 int n;
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95 char *p;
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96 RETSIGTYPE (*old_inthandler)();
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97 PyOS_ReadlineInit();
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98 old_inthandler = signal(SIGINT, onintr);
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99 if (setjmp(jbuf)) {
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100 #ifdef HAVE_SIGRELSE
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101 /* This seems necessary on SunOS 4.1 (Rasmus Hahn) */
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102 sigrelse(SIGINT);
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103 #endif
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104 signal(SIGINT, old_inthandler);
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105 return NULL;
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106 }
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107 p = readline(prompt);
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108 signal(SIGINT, old_inthandler);
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109 if (p == NULL) {
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110 p = malloc(1);
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111 if (p != NULL)
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112 *p = '\0';
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113 return p;
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114 }
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115 n = strlen(p);
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116 if (n > 0)
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117 add_history(p);
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118 if ((p = realloc(p, n+2)) != NULL) {
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119 p[n] = '\n';
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120 p[n+1] = '\0';
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121 }
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122 return p;
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123 }
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124
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125 #endif /* !WITH_READLINE */
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126
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127
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128 /* This function restarts a fgets() after an EINTR error occurred
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129 except if PyOS_InterruptOccurred() returns true. */
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130
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131 static int
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132 my_fgets(buf, len, fp)
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133 char *buf;
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134 int len;
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135 FILE *fp;
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136 {
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137 char *p;
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138 for (;;) {
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139 errno = 0;
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140 p = fgets(buf, len, fp);
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141 if (p != NULL)
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142 return 0; /* No error */
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143 if (feof(fp)) {
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144 return -1; /* EOF */
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145 }
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146 #ifdef EINTR
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147 if (errno == EINTR) {
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148 if (PyOS_InterruptOccurred()) {
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149 return 1; /* Interrupt */
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150 }
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151 continue;
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152 }
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153 #endif
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154 if (PyOS_InterruptOccurred()) {
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155 return 1; /* Interrupt */
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156 }
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157 return -2; /* Error */
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158 }
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159 /* NOTREACHED */
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160 }
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161
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162
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163 /* Readline implementation using fgets() */
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164
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165 char *
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166 PyOS_StdioReadline(prompt)
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167 char *prompt;
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168 {
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169 int n;
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170 char *p;
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171 n = 100;
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172 if ((p = malloc(n)) == NULL)
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173 return NULL;
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174 fflush(stdout);
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175 if (prompt)
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176 fprintf(stderr, "%s", prompt);
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177 fflush(stderr);
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178 switch (my_fgets(p, n, stdin)) {
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179 case 0: /* Normal case */
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180 break;
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181 case 1: /* Interrupt */
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182 free(p);
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183 return NULL;
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184 case -1: /* EOF */
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185 case -2: /* Error */
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186 default: /* Shouldn't happen */
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187 *p = '\0';
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188 break;
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189 }
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190 #ifdef MPW
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191 /* Hack for MPW C where the prompt comes right back in the input */
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192 /* XXX (Actually this would be rather nice on most systems...) */
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193 n = strlen(prompt);
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194 if (strncmp(p, prompt, n) == 0)
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195 memmove(p, p + n, strlen(p) - n + 1);
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196 #endif
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197 n = strlen(p);
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198 while (n > 0 && p[n-1] != '\n') {
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199 int incr = n+2;
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200 p = realloc(p, n + incr);
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201 if (p == NULL)
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202 return NULL;
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203 if (my_fgets(p+n, incr, stdin) != 0)
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204 break;
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205 n += strlen(p+n);
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206 }
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207 return realloc(p, n+1);
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208 }
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209
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210
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211 /* By initializing this function pointer, systems embedding Python can
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212 override the readline function. */
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213
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214 char *(*PyOS_ReadlineFunctionPointer) Py_PROTO((char *));
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215
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216
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217 /* Interface used by tokenizer.c and bltinmodule.c */
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218
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219 char *
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220 PyOS_Readline(prompt)
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221 char *prompt;
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222 {
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223 if (PyOS_ReadlineFunctionPointer == NULL) {
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224 #ifdef WITH_READLINE
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225 if (isatty(fileno(stdin)))
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226 PyOS_ReadlineFunctionPointer = PyOS_GnuReadline;
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227 else
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228 #endif
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229 PyOS_ReadlineFunctionPointer = PyOS_StdioReadline;
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230 }
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231 return (*PyOS_ReadlineFunctionPointer)(prompt);
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232 }