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add HISTSIZE for readline to limit the number of cached commands

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This commit is contained in:
chenxiaobin
2021-03-19 15:39:15 +08:00
parent f72445a6cf
commit ee87e03e47
9 changed files with 96 additions and 1 deletions
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39
src/bin/psql/input.cpp
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@ -248,6 +248,45 @@ bool SensitiveStrCheck(const char* target)
}
}
void setHistSize(const char* targetName, const char* targetValue, bool setToDefault)
{
#ifndef ENABLE_LLT
char* end = NULL;
long int result;
#define MAXHISTSIZE 500
#define DEFHISTSIZE 32
if (targetName == NULL) {
return;
}
if (strcmp(targetName, "HISTSIZE") == 0) {
if (!setToDefault) {
if (targetValue == NULL || strlen(targetValue) == 0) {
fprintf(stderr, "warning:\"HISTSIZE\" is not changed,because its value can not be null\n");
return;
} else {
errno = 0;
result = strtol(targetValue, &end, 0);
if ((errno == ERANGE && (result == LONG_MAX || result == LONG_MIN)) || (errno != 0 && result == 0)) {
fprintf(stderr, "warning:\"HISTSIZE\" is not changed,because its value overflows\n");
return;
}
if (*end || result < 0) {
fprintf(stderr, "warning:\"HISTSIZE\" is not changed,because its value must be positive integer\n");
return;
}
}
if (result > MAXHISTSIZE) {
fprintf(stderr, "warning:\"HISTSIZE\" is set to 500,because its value can not be greater than 500\n");
result = MAXHISTSIZE;
}
} else {
result = DEFHISTSIZE;
}
stifle_history((int)result);
}
#endif
}
/*
* Put any startup stuff related to input in here. It's good to maintain
* abstraction this way.