From e816026faa1ae11f0e9d26d27f420a304d4ad210 Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周五, 16 10月 2015 06:16:45 +0800
Subject: [PATCH] Resolve #59: input buffer overrun handling
---
libscpi/src/utils.c | 746 ++++++++++++++++++++++++++++++++++++++++++++------------
1 files changed, 579 insertions(+), 167 deletions(-)
diff --git a/libscpi/src/utils.c b/libscpi/src/utils.c
index 9f9e2e7..f92e877 100644
--- a/libscpi/src/utils.c
+++ b/libscpi/src/utils.c
@@ -1,8 +1,10 @@
/*-
- * Copyright (c) 2012-2013 Jan Breuer,
+ * Copyright (c) 2013 Jan Breuer
+ * Richard.hmm
+ * Copyright (c) 2012 Jan Breuer
*
* All Rights Reserved
- *
+ *
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
@@ -11,7 +13,7 @@
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
- *
+ *
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
@@ -28,10 +30,10 @@
/**
* @file scpi_utils.c
* @date Thu Nov 15 10:58:45 UTC 2012
- *
+ *
* @brief Conversion routines and string manipulation routines
- *
- *
+ *
+ *
*/
#include <stdio.h>
@@ -39,16 +41,19 @@
#include <string.h>
#include <ctype.h>
-#include "utils.h"
+#include "utils_private.h"
+#include "scpi/utils.h"
static size_t patternSeparatorShortPos(const char * pattern, size_t len);
+static size_t patternSeparatorPos(const char * pattern, size_t len);
+static size_t cmdSeparatorPos(const char * cmd, size_t len);
/**
* Find the first occurrence in str of a character in set.
* @param str
* @param size
* @param set
- * @return
+ * @return
*/
char * strnpbrk(const char *str, size_t size, const char *set) {
const char *scanp;
@@ -64,50 +69,201 @@
}
/**
- * Converts signed 32b integer value to string
+ * Converts signed/unsigned 32 bit integer value to string in specific base
* @param val integer value
* @param str converted textual representation
* @param len string buffer length
+ * @param base output base
+ * @param sign
* @return number of bytes written to str (without '\0')
*/
-size_t longToStr(int32_t val, char * str, size_t len) {
- uint32_t x = 1000000000L;
+size_t UInt32ToStrBaseSign(uint32_t val, char * str, size_t len, int8_t base, scpi_bool_t sign) {
+ const char digits[] = "0123456789ABCDEF";
+
+#define ADD_CHAR(c) if (pos < len) str[pos++] = (c)
+ uint32_t x = 0;
int_fast8_t digit;
size_t pos = 0;
+ uint32_t uval = val;
- if (val == 0) {
- if (pos < len) str[pos++] = '0';
+ if (uval == 0) {
+ ADD_CHAR('0');
} else {
- if (val < 0) {
- val = -val;
- if (pos < len) str[pos++] = '-';
+
+ switch (base) {
+ case 2:
+ x = 0x80000000L;
+ break;
+ case 8:
+ x = 0x40000000L;
+ break;
+ case 10:
+ x = 1000000000L;
+ break;
+ case 16:
+ x = 0x10000000L;
+ break;
+ default:
+ x = 1000000000L;
+ base = 10;
+ break;
}
- while ((val / x) == 0) {
- x /= 10;
+ // add sign for numbers in base 10
+ if (sign && ((int32_t) val < 0) && (base == 10)) {
+ uval = -val;
+ ADD_CHAR('-');
+ }
+
+ // remove leading zeros
+ while ((uval / x) == 0) {
+ x /= base;
}
do {
- digit = (uint8_t) (val / x);
- if (pos < len) str[pos++] = digit + '0';
- val -= digit * x;
- x /= 10;
+ digit = (uint8_t) (uval / x);
+ ADD_CHAR(digits[digit]);
+ uval -= digit * x;
+ x /= base;
} while (x && (pos < len));
}
if (pos < len) str[pos] = 0;
return pos;
+#undef ADD_CHAR
}
/**
- * Converts double value to string
+ * Converts signed 32 bit integer value to string
+ * @param val integer value
+ * @param str converted textual representation
+ * @param len string buffer length
+ * @return number of bytes written to str (without '\0')
+ */
+size_t SCPI_Int32ToStr(int32_t val, char * str, size_t len) {
+ return UInt32ToStrBaseSign((int32_t) val, str, len, 10, TRUE);
+}
+
+/**
+ * Converts unsigned 32 bit integer value to string in specific base
+ * @param val integer value
+ * @param str converted textual representation
+ * @param len string buffer length
+ * @param base output base
+ * @return number of bytes written to str (without '\0')
+ */
+size_t SCPI_UInt32ToStrBase(uint32_t val, char * str, size_t len, int8_t base) {
+ return UInt32ToStrBaseSign(val, str, len, base, FALSE);
+}
+
+/**
+ * Converts signed/unsigned 64 bit integer value to string in specific base
+ * @param val integer value
+ * @param str converted textual representation
+ * @param len string buffer length
+ * @param base output base
+ * @param sign
+ * @return number of bytes written to str (without '\0')
+ */
+size_t UInt64ToStrBaseSign(uint64_t val, char * str, size_t len, int8_t base, scpi_bool_t sign) {
+ const char digits[] = "0123456789ABCDEF";
+
+#define ADD_CHAR(c) if (pos < len) str[pos++] = (c)
+ uint64_t x = 0;
+ int_fast8_t digit;
+ size_t pos = 0;
+ uint64_t uval = val;
+
+ if (uval == 0) {
+ ADD_CHAR('0');
+ } else {
+
+ switch (base) {
+ case 2:
+ x = 0x8000000000000000ULL;
+ break;
+ case 8:
+ x = 0x8000000000000000ULL;
+ break;
+ case 10:
+ x = 10000000000000000000ULL;
+ break;
+ case 16:
+ x = 0x1000000000000000ULL;
+ break;
+ default:
+ x = 10000000000000000000ULL;
+ base = 10;
+ break;
+ }
+
+ // add sign for numbers in base 10
+ if (sign && ((int64_t) val < 0) && (base == 10)) {
+ uval = -val;
+ ADD_CHAR('-');
+ }
+
+ // remove leading zeros
+ while ((uval / x) == 0) {
+ x /= base;
+ }
+
+ do {
+ digit = (uint8_t) (uval / x);
+ ADD_CHAR(digits[digit]);
+ uval -= digit * x;
+ x /= base;
+ } while (x && (pos < len));
+ }
+
+ if (pos < len) str[pos] = 0;
+ return pos;
+#undef ADD_CHAR
+}
+
+/**
+ * Converts signed 64 bit integer value to string
+ * @param val integer value
+ * @param str converted textual representation
+ * @param len string buffer length
+ * @return number of bytes written to str (without '\0')
+ */
+size_t SCPI_Int64ToStr(int64_t val, char * str, size_t len) {
+ return UInt64ToStrBaseSign((int64_t) val, str, len, 10, TRUE);
+}
+
+/**
+ * Converts signed/unsigned 64 bit integer value to string in specific base
+ * @param val integer value
+ * @param str converted textual representation
+ * @param len string buffer length
+ * @param base output base
+ * @return number of bytes written to str (without '\0')
+ */
+size_t SCPI_UInt64ToStrBase(uint64_t val, char * str, size_t len, int8_t base) {
+ return UInt64ToStrBaseSign(val, str, len, base, FALSE);
+}
+
+/**
+ * Converts float (32 bit) value to string
+ * @param val long value
+ * @param str converted textual representation
+ * @param len string buffer length
+ * @return number of bytes written to str (without '\0')
+ */
+size_t SCPI_FloatToStr(float val, char * str, size_t len) {
+ return SCPIDEFINE_floatToStr(val, str, len);
+}
+
+/**
+ * Converts double (64 bit) value to string
* @param val double value
* @param str converted textual representation
* @param len string buffer length
* @return number of bytes written to str (without '\0')
*/
-size_t doubleToStr(double val, char * str, size_t len) {
- return snprintf(str, len, "%lg", val);
+size_t SCPI_DoubleToStr(double val, char * str, size_t len) {
+ return SCPIDEFINE_doubleToStr(val, str, len);
}
/**
@@ -116,14 +272,62 @@
* @param val 32bit integer result
* @return number of bytes used in string
*/
-size_t strToLong(const char * str, int32_t * val) {
+size_t strBaseToInt32(const char * str, int32_t * val, int8_t base) {
char * endptr;
- *val = strtol(str, &endptr, 0);
+ *val = strtol(str, &endptr, base);
return endptr - str;
}
/**
- * Converts string to double representation
+ * Converts string to unsigned 32bit integer representation
+ * @param str string value
+ * @param val 32bit integer result
+ * @return number of bytes used in string
+ */
+size_t strBaseToUInt32(const char * str, uint32_t * val, int8_t base) {
+ char * endptr;
+ *val = strtoul(str, &endptr, base);
+ return endptr - str;
+}
+
+/**
+ * Converts string to signed 64bit integer representation
+ * @param str string value
+ * @param val 64bit integer result
+ * @return number of bytes used in string
+ */
+size_t strBaseToInt64(const char * str, int64_t * val, int8_t base) {
+ char * endptr;
+ *val = strtol(str, &endptr, base);
+ return endptr - str;
+}
+
+/**
+ * Converts string to unsigned 64bit integer representation
+ * @param str string value
+ * @param val 64bit integer result
+ * @return number of bytes used in string
+ */
+size_t strBaseToUInt64(const char * str, uint64_t * val, int8_t base) {
+ char * endptr;
+ *val = strtoull(str, &endptr, base);
+ return endptr - str;
+}
+
+/**
+ * Converts string to float (32 bit) representation
+ * @param str string value
+ * @param val float result
+ * @return number of bytes used in string
+ */
+size_t strToFloat(const char * str, float * val) {
+ char * endptr;
+ *val = strtof(str, &endptr);
+ return endptr - str;
+}
+
+/**
+ * Converts string to double (64 bit) representation
* @param str string value
* @param val double result
* @return number of bytes used in string
@@ -142,156 +346,60 @@
* @param len2
* @return TRUE if len1==len2 and "len" characters of both strings are equal
*/
-bool_t compareStr(const char * str1, size_t len1, const char * str2, size_t len2) {
+scpi_bool_t compareStr(const char * str1, size_t len1, const char * str2, size_t len2) {
if (len1 != len2) {
return FALSE;
}
- if (strncasecmp(str1, str2, len2) == 0) {
+ if (SCPIDEFINE_strncasecmp(str1, str2, len2) == 0) {
return TRUE;
}
return FALSE;
}
-bool_t locateText(const char * str1, size_t len1, char ** str2, size_t * len2) {
+/**
+ * Compare two strings, one be longer but may contains only numbers in that section
+ * @param str1
+ * @param len1
+ * @param str2
+ * @param len2
+ * @return TRUE if strings match
+ */
+scpi_bool_t compareStrAndNum(const char * str1, size_t len1, const char * str2, size_t len2, int32_t * num) {
+ scpi_bool_t result = FALSE;
size_t i;
- int quot = 0;
- int32_t strStart = -1;
- int32_t strStop = -1;
- int valid = 0;
-
- for (i = 0; i < len1; i++) {
- if ((strStart < 0) && isspace(str1[i])) {
- continue;
- }
-
- if ((strStart < 0) && !quot && (str1[i] == '"')) {
- quot = 1;
- continue;
- }
-
- if (strStart < 0) {
- strStart = i;
- }
-
- if ((strStop < 0) && quot && (str1[i] == '"')) {
- strStop = i;
- valid = 1;
- continue;
- }
-
- if ((strStop >= 0) && quot && (str1[i] == ',')) {
- break;
- }
-
- if ((strStop >= 0) && quot && !isspace(str1[i])) {
- valid = 0;
- }
-
- if (!quot && !isspace(str1[i]) && (str1[i] != ',')) {
- strStop = i;
- }
-
- if (isspace(str1[i])) {
- continue;
- }
-
- if ((strStop >= 0) && (str1[i] == ',')) {
- valid = 1;
- break;
- }
+ if (len2 < len1) {
+ return FALSE;
}
- if ((i == len1) && !quot) {
- valid = 1;
- if (strStop < 0) {
- strStop = i;
- } else {
- strStop++;
- }
- if (strStart < 0) {
- strStart = i;
- }
- } else if (!quot) {
- strStop++;
- }
+ if (SCPIDEFINE_strncasecmp(str1, str2, len1) == 0) {
+ result = TRUE;
-
- if (valid) {
- if (str2) {
- *str2 = (char *) &str1[strStart];
- }
-
- if (len2) {
- *len2 = strStop - strStart;
- }
- }
-
- return valid;
-}
-
-bool_t locateStr(const char * str1, size_t len1, char ** str2, size_t * len2) {
- size_t i;
- int32_t strStart = -1;
- int32_t strStop = -1;
- int valid = 0;
-
-
- for (i = 0; i < len1; i++) {
- if ((strStart < 0) && isspace(str1[i])) {
- continue;
- }
-
- if (strStart < 0) {
- strStart = i;
- }
-
- if (!isspace(str1[i]) && (str1[i] != ',')) {
- strStop = i;
- }
-
- if (isspace(str1[i])) {
- continue;
- }
-
- if (str1[i] == ',') {
- valid = 1;
-
- if (strStop < 0) {
- strStop = i;
+ if (num) {
+ if (len1 == len2) {
+ //*num = 1;
+ } else {
+ int32_t tmpNum;
+ i = len1 + strBaseToInt32(str2 + len1, &tmpNum, 10);
+ if (i != len2) {
+ result = FALSE;
+ } else {
+ *num = tmpNum;
+ }
}
- break;
- }
- }
-
- if (i == len1) {
- valid = 1;
- if (strStop < 0) {
- strStop = i;
} else {
- strStop++;
- }
- if (strStart < 0) {
- strStart = i;
- }
- } else {
- strStop++;
- }
-
-
- if (valid) {
- if (str2) {
- *str2 = (char *) &str1[strStart];
- }
-
- if (len2) {
- *len2 = strStop - strStart;
+ for (i = len1; i < len2; i++) {
+ if (!isdigit((int) str2[i])) {
+ result = FALSE;
+ break;
+ }
+ }
}
}
- return valid;
+ return result;
}
/**
@@ -303,13 +411,12 @@
size_t skipWhitespace(const char * cmd, size_t len) {
size_t i;
for (i = 0; i < len; i++) {
- if (!isspace(cmd[i])) {
+ if (!isspace((unsigned char) cmd[i])) {
return i;
}
}
return len;
}
-
/**
* Pattern is composed from upper case an lower case letters. This function
@@ -318,14 +425,48 @@
* @param len - max search length
* @return position of separator or len
*/
-size_t patternSeparatorShortPos(const char * pattern, size_t len) {
+static size_t patternSeparatorShortPos(const char * pattern, size_t len) {
size_t i;
for (i = 0; (i < len) && pattern[i]; i++) {
- if (islower(pattern[i])) {
+ if (islower((unsigned char) pattern[i])) {
return i;
}
}
return i;
+}
+
+/**
+ * Find pattern separator position
+ * @param pattern
+ * @param len - max search length
+ * @return position of separator or len
+ */
+static size_t patternSeparatorPos(const char * pattern, size_t len) {
+
+ char * separator = strnpbrk(pattern, len, "?:[]");
+ if (separator == NULL) {
+ return len;
+ } else {
+ return separator - pattern;
+ }
+}
+
+/**
+ * Find command separator position
+ * @param cmd - input command
+ * @param len - max search length
+ * @return position of separator or len
+ */
+static size_t cmdSeparatorPos(const char * cmd, size_t len) {
+ char * separator = strnpbrk(cmd, len, ":?");
+ size_t result;
+ if (separator == NULL) {
+ result = len;
+ } else {
+ result = separator - cmd;
+ }
+
+ return result;
}
/**
@@ -334,10 +475,281 @@
* @param pattern_len
* @param str
* @param str_len
- * @return
+ * @return
*/
-bool_t matchPattern(const char * pattern, size_t pattern_len, const char * str, size_t str_len) {
- int pattern_sep_pos_short = patternSeparatorShortPos(pattern, pattern_len);
- return compareStr(pattern, pattern_len, str, str_len) ||
- compareStr(pattern, pattern_sep_pos_short, str, str_len);
+scpi_bool_t matchPattern(const char * pattern, size_t pattern_len, const char * str, size_t str_len, int32_t * num) {
+ int pattern_sep_pos_short;
+
+ if ((pattern_len > 0) && pattern[pattern_len - 1] == '#') {
+ size_t new_pattern_len = pattern_len - 1;
+
+ pattern_sep_pos_short = patternSeparatorShortPos(pattern, new_pattern_len);
+
+ return compareStrAndNum(pattern, new_pattern_len, str, str_len, num) ||
+ compareStrAndNum(pattern, pattern_sep_pos_short, str, str_len, num);
+ } else {
+
+ pattern_sep_pos_short = patternSeparatorShortPos(pattern, pattern_len);
+
+ return compareStr(pattern, pattern_len, str, str_len) ||
+ compareStr(pattern, pattern_sep_pos_short, str, str_len);
+ }
}
+
+/**
+ * Compare pattern and command
+ * @param pattern eg. [:MEASure]:VOLTage:DC?
+ * @param cmd - command
+ * @param len - max search length
+ * @return TRUE if pattern matches, FALSE otherwise
+ */
+scpi_bool_t matchCommand(const char * pattern, const char * cmd, size_t len, int32_t *numbers, size_t numbers_len, int32_t default_value) {
+#define SKIP_PATTERN(n) do {pattern_ptr += (n); pattern_len -= (n);} while(0)
+#define SKIP_CMD(n) do {cmd_ptr += (n); cmd_len -= (n);} while(0)
+
+ scpi_bool_t result = FALSE;
+ int brackets = 0;
+ int cmd_sep_pos = 0;
+
+ size_t numbers_idx = 0;
+ int32_t *number_ptr = NULL;
+
+ const char * pattern_ptr = pattern;
+ int pattern_len = strlen(pattern);
+
+ const char * cmd_ptr = cmd;
+ size_t cmd_len = SCPIDEFINE_strnlen(cmd, len);
+
+ /* both commands are query commands? */
+ if (pattern_ptr[pattern_len - 1] == '?') {
+ if (cmd_ptr[cmd_len - 1] == '?') {
+ cmd_len -= 1;
+ pattern_len -= 1;
+ } else {
+ return FALSE;
+ }
+ }
+
+ /* now support optional keywords in pattern style, e.g. [:MEASure]:VOLTage:DC? */
+ if (pattern_ptr[0] == '[') { // skip first '['
+ SKIP_PATTERN(1);
+ brackets++;
+ }
+ if (pattern_ptr[0] == ':') { // skip first ':'
+ SKIP_PATTERN(1);
+ }
+
+ if (cmd_ptr[0] == ':') {
+ /* handle errornouse ":*IDN?" */
+ if (cmd_len >= 2) {
+ if (cmd_ptr[1] != '*') {
+ SKIP_CMD(1);
+ } else {
+ return FALSE;
+ }
+ }
+ }
+
+ while (1) {
+ int pattern_sep_pos = patternSeparatorPos(pattern_ptr, pattern_len);
+
+ cmd_sep_pos = cmdSeparatorPos(cmd_ptr, cmd_len);
+
+ if ((pattern_sep_pos > 0) && pattern_ptr[pattern_sep_pos - 1] == '#') {
+ if (numbers && (numbers_idx < numbers_len)) {
+ number_ptr = numbers + numbers_idx;
+ *number_ptr = default_value; // default value
+ } else {
+ number_ptr = NULL;
+ }
+ numbers_idx++;
+ } else {
+ number_ptr = NULL;
+ }
+
+ if (matchPattern(pattern_ptr, pattern_sep_pos, cmd_ptr, cmd_sep_pos, number_ptr)) {
+ SKIP_PATTERN(pattern_sep_pos);
+ SKIP_CMD(cmd_sep_pos);
+ result = TRUE;
+
+ /* command is complete */
+ if ((pattern_len == 0) && (cmd_len == 0)) {
+ break;
+ }
+
+ /* pattern complete, but command not */
+ if ((pattern_len == 0) && (cmd_len > 0)) {
+ result = FALSE;
+ break;
+ }
+
+ /* command complete, but pattern not */
+ if (cmd_len == 0) {
+ // verify all subsequent pattern parts are also optional
+ while (pattern_len) {
+ pattern_sep_pos = patternSeparatorPos(pattern_ptr, pattern_len);
+ switch (pattern_ptr[pattern_sep_pos]) {
+ case '[':
+ brackets++;
+ break;
+ case ']':
+ brackets--;
+ break;
+ default:
+ break;
+ }
+ SKIP_PATTERN(pattern_sep_pos + 1);
+ if (brackets == 0) {
+ if ((pattern_len > 0) && (pattern_ptr[0] == '[')) {
+ continue;
+ } else {
+ break;
+ }
+ }
+ }
+ if (pattern_len != 0) {
+ result = FALSE;
+ }
+ break; /* exist optional keyword, command is complete */
+ }
+
+ /* both command and patter contains command separator at this position */
+ if ((pattern_len > 0)
+ && ((pattern_ptr[0] == cmd_ptr[0])
+ && (pattern_ptr[0] == ':'))) {
+ SKIP_PATTERN(1);
+ SKIP_CMD(1);
+ } else if ((pattern_len > 1)
+ && (pattern_ptr[1] == cmd_ptr[0])
+ && (pattern_ptr[0] == '[')
+ && (pattern_ptr[1] == ':')) {
+ SKIP_PATTERN(2); // for skip '[' in "[:"
+ SKIP_CMD(1);
+ brackets++;
+ } else if ((pattern_len > 1)
+ && (pattern_ptr[1] == cmd_ptr[0])
+ && (pattern_ptr[0] == ']')
+ && (pattern_ptr[1] == ':')) {
+ SKIP_PATTERN(2); // for skip ']' in "]:"
+ SKIP_CMD(1);
+ brackets--;
+ } else if ((pattern_len > 2)
+ && (pattern_ptr[2] == cmd_ptr[0])
+ && (pattern_ptr[0] == ']')
+ && (pattern_ptr[1] == '[')
+ && (pattern_ptr[2] == ':')) {
+ SKIP_PATTERN(3); // for skip '][' in "][:"
+ SKIP_CMD(1);
+ //brackets++;
+ //brackets--;
+ } else {
+ result = FALSE;
+ break;
+ }
+ } else {
+ SKIP_PATTERN(pattern_sep_pos);
+ if ((pattern_ptr[0] == ']') && (pattern_ptr[1] == ':')) {
+ SKIP_PATTERN(2); // for skip ']' in "]:" , pattern_ptr continue, while cmd_ptr remain unchanged
+ brackets--;
+ } else if ((pattern_len > 2) && (pattern_ptr[0] == ']')
+ && (pattern_ptr[1] == '[')
+ && (pattern_ptr[2] == ':')) {
+ SKIP_PATTERN(3); // for skip ']' in "][:" , pattern_ptr continue, while cmd_ptr remain unchanged
+ //brackets++;
+ //brackets--;
+ } else {
+ result = FALSE;
+ break;
+ }
+ }
+ }
+
+ return result;
+#undef SKIP_PATTERN
+#undef SKIP_CMD
+}
+
+/**
+ * Compose command from previous command anc current command
+ *
+ * @param prev pointer to previous command
+ * @param current pointer of current command
+ *
+ * prev and current should be in the same memory buffer
+ */
+scpi_bool_t composeCompoundCommand(const scpi_token_t * prev, scpi_token_t * current) {
+ size_t i;
+
+ /* Invalid input */
+ if (current == NULL || current->ptr == NULL || current->len == 0)
+ return FALSE;
+
+ /* no previous command - nothing to do*/
+ if (prev->ptr == NULL || prev->len == 0)
+ return TRUE;
+
+ /* Common command or command root - nothing to do */
+ if (current->ptr[0] == '*' || current->ptr[0] == ':')
+ return TRUE;
+
+ /* Previsou command was common command - nothing to do */
+ if (prev->ptr[0] == '*')
+ return TRUE;
+
+ /* Find last occurence of ':' */
+ for (i = prev->len; i > 0; i--) {
+ if (prev->ptr[i - 1] == ':') {
+ break;
+ }
+ }
+
+ /* Previous command was simple command - nothing to do*/
+ if (i == 0)
+ return TRUE;
+
+ current->ptr -= i;
+ current->len += i;
+ memmove(current->ptr, prev->ptr, i);
+ return TRUE;
+}
+
+
+
+#if !HAVE_STRNLEN
+/* use FreeBSD strnlen */
+
+/*-
+ * Copyright (c) 2009 David Schultz <das@FreeBSD.org>
+ * All rights reserved.
+ */
+size_t
+BSD_strnlen(const char *s, size_t maxlen) {
+ size_t len;
+
+ for (len = 0; len < maxlen; len++, s++) {
+ if (!*s)
+ break;
+ }
+ return (len);
+}
+#endif
+
+#if !HAVE_STRNCASECMP && !HAVE_STRNICMP
+
+int OUR_strncasecmp(const char *s1, const char *s2, size_t n) {
+ unsigned char c1, c2;
+
+ for (; n != 0; n--) {
+ c1 = tolower((unsigned char) *s1++);
+ c2 = tolower((unsigned char) *s2++);
+ if (c1 != c2) {
+ return c1 - c2;
+ }
+ if (c1 == '\0') {
+ return 0;
+ }
+ }
+ return 0;
+}
+#endif
+
--
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