source: patches/expect-5.43.0-spawn-2.patch@ d8bfbe2

exp_chan.c

@@ -622 +622 @@
     esPtr->buffer = Tcl_NewStringObj("",0);
     Tcl_IncrRefCount(esPtr->buffer);
     esPtr->umsize = exp_default_match_max;
+    esPtr->umsize_changed = exp_default_match_max_changed;
     /* this will reallocate object with an appropriate sized buffer */
     expAdjust(esPtr);
 

exp_command.h

@@ -30 +30 @@
 EXTERN char *           exp_get_var _ANSI_ARGS_((Tcl_Interp *,char *));
 
 EXTERN int exp_default_match_max;
+EXTERN int exp_default_match_max_changed;
 EXTERN int exp_default_parity;
 EXTERN int exp_default_rm_nulls;
 EXTERN int exp_default_close_on_eof;
@@ -103 +104 @@
     int msize;          /* # of bytes that buffer can hold (max) */
     int umsize;         /* # of bytes (min) that is guaranteed to match */
                         /* this comes from match_max command */
+    int umsize_changed; /* is umsize changed by user?  */
     int printed;        /* # of bytes written to stdout (if logging on) */
                         /* but not actually returned via a match yet */
     int echoed;         /* additional # of bytes (beyond "printed" above) */

expect.c

@@ -41 +41 @@
 #include "tcldbg.h"
 #endif
 
+/* The initial length is 2000. We increment it by 2000. The maximum
+   is 8MB (0x800000).  */
+#define EXP_MATCH_MAX           2000
+#define EXP_MATCH_INC           2000
+#define EXP_MATCH_STEP_LIMIT    0x700000
+#define EXP_MATCH_LIMIT         0x800000
+#define EXP_MATCH_LIMIT_QUOTE   "0x800000"
+
 /* initial length of strings that we can guarantee patterns can match */
-int exp_default_match_max =     2000;
+int exp_default_match_max =     EXP_MATCH_MAX;
+int exp_default_match_max_changed = 0;
 #define INIT_EXPECT_TIMEOUT_LIT "10"    /* seconds */
 #define INIT_EXPECT_TIMEOUT     10      /* seconds */
 int exp_default_parity =        TRUE;
@@ -1619 +1628 @@
     return newsize;
 }
 
+/* returns # of bytes until we see a newline at the end or EOF.  */
+/*ARGSUSED*/
+static int
+expReadNewLine(interp,esPtr,save_flags) /* INTL */
+Tcl_Interp *interp;
+ExpState *esPtr;
+int save_flags;
+{
+    int size;
+    int exp_size;
+    int full_size;
+    int count;
+    char *str;
+
+    count = 0;
+    for (;;) {
+        exp_size = expSizeGet(esPtr);
+
+        /* When we reach the limit, we will only read one char at a
+           time.  */
+        if (esPtr->umsize >= EXP_MATCH_STEP_LIMIT)
+            size = TCL_UTF_MAX;
+        else
+            size = exp_size;
+
+        if (exp_size + TCL_UTF_MAX >= esPtr->msize) {
+            if (esPtr->umsize >= EXP_MATCH_LIMIT) {
+                expDiagLogU("WARNING: interact buffer is full. probably your program\r\n");
+                expDiagLogU("is not interactive or has a very long output line. The\r\n");
+                expDiagLogU("current limit is " EXP_MATCH_LIMIT_QUOTE ".\r\n");
+                expDiagLogU("Dumping first half of buffer in order to continue\r\n");
+                expDiagLogU("Recommend you enlarge the buffer.\r\n");
+                exp_buffer_shuffle(interp,esPtr,save_flags,EXPECT_OUT,"expect");
+                return count;
+            }
+            else {
+                esPtr->umsize += EXP_MATCH_INC;
+                expAdjust(esPtr);
+            }
+        }
+
+        full_size = esPtr->msize - (size / TCL_UTF_MAX);
+        size = Tcl_ReadChars(esPtr->channel,
+                        esPtr->buffer,
+                        full_size,
+                        1 /* append */);
+        if (size > 0) {
+            count += size;
+            /* We try again if there are more to read and we haven't
+               seen a newline at the end. */
+            if (size == full_size) {
+                str = Tcl_GetStringFromObj(esPtr->buffer, &size);
+                if (str[size - 1] != '\n')
+                    continue;
+            }
+        }
+        else {
+            /* It is even trickier. We got an error from read. We have
+               to recover from it. Let's make sure the size of
+               buffer is correct. It can be corrupted. */
+            str = Tcl_GetString(esPtr->buffer);
+            Tcl_SetObjLength(esPtr->buffer, strlen(str));
+        }
+
+        break;
+    }
+
+    return count;
+}
+
 /* returns # of bytes read or (non-positive) error of form EXP_XXX */
 /* returns 0 for end of file */
 /* If timeout is non-zero, set an alarm before doing the read, else assume */
@@ -1633 +1712 @@
 {
     int cc = EXP_TIMEOUT;
     int size = expSizeGet(esPtr);
+    int full_size;
+    int count;
 
     if (size + TCL_UTF_MAX >= esPtr->msize) 
         exp_buffer_shuffle(interp,esPtr,save_flags,EXPECT_OUT,"expect");
@@ -1649 +1730 @@
     }
 #endif
 
-    
+    /* FIXME: If we ask less than what is available in the tcl buffer
+       when tcl has seen EOF, we will throw away the remaining data
+       since the next read will get EOF. Since expect is line-oriented,
+       we exand our buffer to get EOF or the next newline at the end of
+       the input buffer. I don't know if it is the right fix.  H.J. */
+    count = 0;
+    full_size = esPtr->msize - (size / TCL_UTF_MAX);
     cc = Tcl_ReadChars(esPtr->channel,
-            esPtr->buffer,
-            esPtr->msize - (size / TCL_UTF_MAX),
-            1 /* append */);
+                esPtr->buffer,
+                full_size,
+                1 /* append */);
+    if (cc > 0) {
+        count += cc;
+        /* It gets very tricky. There are more to read. We will expand
+           our buffer and get EOF or a newline at the end unless the
+           buffer length has been changed.  */
+        if (cc == full_size) {
+            char *str;
+            str = Tcl_GetStringFromObj(esPtr->buffer, &size);
+            if (str[size - 1] != '\n') {
+                if (esPtr->umsize_changed) {
+                    char buf[20];       /* big enough for 64bit int in hex.  */
+                    snprintf(buf,sizeof(buf),"0x%x", esPtr->umsize);
+                    expDiagLogU("WARNING: interact buffer is not large enough to hold\r\n");
+                    expDiagLogU("all output. probably your program is not interactive or\r\n");
+                    expDiagLogU("has a very long output line. The current limit is ");
+                    expDiagLogU(buf);
+                    expDiagLogU(".\r\n");
+                }
+                else {
+                    cc = expReadNewLine(interp,esPtr,save_flags);
+                    if (cc > 0)
+                        count += cc;
+                }
+            }
+        }
+    }
     i_read_errno = errno;
 
 #ifdef SIMPLE_EVENT
@@ -1674 +1787 @@
         }
     }
 #endif
-    return cc;  
+    return count > 0 ? count : cc;
 }
 
 /*
@@ -2751 +2864 @@
         return(TCL_ERROR);
     }
 
-    if (Default) exp_default_match_max = size;
-    else esPtr->umsize = size;
+    if (Default) {
+        exp_default_match_max = size;
+        exp_default_match_max_changed = 1;
+    }
+    else {
+        esPtr->umsize = size;
+        esPtr->umsize_changed = 1;
+    }
 
     return(TCL_OK);
 }