first commit for openGauss connect odbc code
This commit is contained in:
lishifu
314
misc.c
Normal file
314
misc.c
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@ -0,0 +1,314 @@
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/*-------
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* Module: misc.c
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*
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* Description: This module contains miscellaneous routines
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* such as for debugging/logging and string functions.
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*
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* Classes: n/a
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*
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* API functions: none
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*
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* Comments: See "readme.txt" for copyright and license information.
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*-------
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*/
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#include "psqlodbc.h"
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#include "misc.h"
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include <time.h>
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#ifndef WIN32
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#include <pwd.h>
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#include <sys/types.h>
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#include <unistd.h>
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#else
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#include <process.h> /* Byron: is this where Windows keeps def.
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* of getpid ? */
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#endif
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/*
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* returns STRCPY_FAIL, STRCPY_TRUNCATED, or #bytes copied
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* (not including null term)
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*/
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ssize_t
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my_strcpy(char *dst, ssize_t dst_len, const char *src, ssize_t src_len)
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{
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if (dst_len <= 0)
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return STRCPY_FAIL;
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if (src_len == SQL_NULL_DATA)
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{
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dst[0] = '\0';
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return STRCPY_NULL;
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}
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else if (src_len == SQL_NTS)
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src_len = strlen(src);
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if (src_len <= 0)
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return STRCPY_FAIL;
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else
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{
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if (src_len < dst_len)
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{
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memcpy(dst, src, src_len);
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dst[src_len] = '\0';
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}
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else
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{
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memcpy(dst, src, dst_len - 1);
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dst[dst_len - 1] = '\0'; /* truncated */
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return STRCPY_TRUNCATED;
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}
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}
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return strlen(dst);
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}
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/*
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* strncpy copies up to len characters, and doesn't terminate
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* the destination string if src has len characters or more.
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* instead, I want it to copy up to len-1 characters and always
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* terminate the destination string.
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*/
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size_t
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strncpy_null(char *dst, const char *src, ssize_t len)
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{
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int i;
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if (NULL != dst && len > 0)
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{
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for (i = 0; src[i] && i < len - 1; i++)
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dst[i] = src[i];
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dst[i] = '\0';
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}
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else
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return 0;
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if (src[i])
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return strlen(src);
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return i;
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}
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/*------
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* Create a null terminated string (handling the SQL_NTS thing):
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* 1. If buf is supplied, place the string in there
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* (assumes enough space) and return buf.
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* 2. If buf is not supplied, malloc space and return this string
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*------
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*/
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char *
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make_string(const SQLCHAR *s, SQLINTEGER len, char *buf, size_t bufsize)
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{
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size_t length;
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char *str;
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if (!s || SQL_NULL_DATA == len)
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return NULL;
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if (len >= 0)
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length =len;
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else if (SQL_NTS == len)
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length = strlen((char *) s);
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else
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{
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MYLOG(0, "invalid length=%d\n", len);
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return NULL;
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}
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if (buf)
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{
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strncpy_null(buf, (char *) s, bufsize > length ? length + 1 : bufsize);
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return buf;
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}
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MYLOG(DETAIL_LOG_LEVEL, "malloc size=" FORMAT_SIZE_T "\n", length);
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str = malloc(length + 1);
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MYLOG(DETAIL_LOG_LEVEL, "str=%p\n", str);
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if (!str)
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return NULL;
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strncpy_null(str, (char *) s, length + 1);
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return str;
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}
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char *
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my_trim(char *s)
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{
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char *last;
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for (last = s + strlen(s) - 1; last >= s; last--)
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{
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if (*last == ' ')
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*last = '\0';
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else
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break;
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}
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return s;
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}
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/*
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* snprintfcat is a extension to snprintf
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* It add format to buf at given pos
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*/
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#ifdef POSIX_SNPRINTF_REQUIRED
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static posix_vsnprintf(char *str, size_t size, const char *format, va_list ap);
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#define vsnprintf posix_vsnprintf
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#endif /* POSIX_SNPRINTF_REQUIRED */
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int
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snprintfcat(char *buf, size_t size, const char *format, ...)
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{
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int len;
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size_t pos = strlen(buf);
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va_list arglist;
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va_start(arglist, format);
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len = vsnprintf(buf + pos, size - pos, format, arglist);
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va_end(arglist);
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return len + pos;
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}
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/*
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* snprintf_len is a extension to snprintf
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* It returns strlen of buf every time (not -1 when truncated)
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*/
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size_t
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snprintf_len(char *buf, size_t size, const char *format, ...)
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{
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ssize_t len;
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va_list arglist;
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va_start(arglist, format);
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if ((len = vsnprintf(buf, size, format, arglist)) < 0)
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len = size;
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va_end(arglist);
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return (size_t)len;
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}
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/*
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* Windows doesn't have snprintf(). It has _snprintf() which is similar,
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* but it behaves differently wrt. truncation. This is a compatibility
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* function that uses _snprintf() to provide POSIX snprintf() behavior.
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*
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* Our strategy, if the output doesn't fit, is to create a temporary buffer
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* and call _snprintf() on that. If it still doesn't fit, enlarge the buffer
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* and repeat.
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*/
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#ifdef POSIX_SNPRINTF_REQUIRED
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static int
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posix_vsnprintf(char *str, size_t size, const char *format, va_list ap)
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{
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int len;
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char *tmp;
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size_t newsize;
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len = _vsnprintf(str, size, format, ap);
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if (len < 0)
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{
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if (size == 0)
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newsize = 100;
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else
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newsize = size;
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do
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{
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newsize *= 2;
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tmp = malloc(newsize);
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if (!tmp)
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return -1;
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len = _vsnprintf(tmp, newsize, format, ap);
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if (len >= 0)
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memcpy(str, tmp, size);
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free(tmp);
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} while (len < 0);
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}
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if (len >= size && size > 0)
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{
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/* Ensure the buffer is NULL-terminated */
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str[size - 1] = '\0';
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}
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return len;
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}
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int
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posix_snprintf(char *buf, size_t size, const char *format, ...)
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{
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int len;
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va_list arglist;
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va_start(arglist, format);
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len = posix_vsnprintf(buf, size, format, arglist);
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va_end(arglist);
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return len;
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}
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#endif /* POSIX_SNPRINTF_REQUIRED */
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#ifndef HAVE_STRLCAT
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size_t
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strlcat(char *dst, const char *src, size_t size)
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{
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size_t ttllen;
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char *pd = dst;
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const char *ps= src;
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for (ttllen = 0; ttllen < size; ttllen++, pd++)
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{
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if (0 == *pd)
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break;
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}
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if (ttllen >= size - 1)
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return ttllen + strlen(src);
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for (; ttllen < size - 1; ttllen++, pd++, ps++)
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{
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if (0 == (*pd = *ps))
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return ttllen;
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}
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*pd = 0;
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for (; *ps; ttllen++, ps++)
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;
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return ttllen;
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}
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#endif /* HAVE_STRLCAT */
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/*
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* Proprly quote and escape a possibly schema-qualified table name.
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*/
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char *
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quote_table(const pgNAME schema, const pgNAME table, char *buf, int buf_size)
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{
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const char *ptr;
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int i;
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i = 0;
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if (NAME_IS_VALID(schema))
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{
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buf[i++] = '"';
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for (ptr = SAFE_NAME(schema); *ptr != '\0' && i < buf_size - 6; ptr++)
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{
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buf[i++] = *ptr;
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if (*ptr == '"')
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buf[i++] = '"'; /* escape quotes by doubling them */
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}
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buf[i++] = '"';
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buf[i++] = '.';
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}
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buf[i++] = '"';
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for (ptr = SAFE_NAME(table); *ptr != '\0' && i < buf_size - 3; ptr++)
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{
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buf[i++] = *ptr;
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if (*ptr == '"')
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buf[i++] = '"'; /* escape quotes by doubling them */
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}
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buf[i++] = '"';
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buf[i] = '\0';
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return buf;
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}
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