From c8c00d2032c12f79df352d4eb573c228099b30cf Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周二, 31 5月 2016 18:15:28 +0800
Subject: [PATCH] Add channel list example call
---
libscpi/src/utils.c | 258 +++++++++++++++++++++++++++++++++++++++++++++------
1 files changed, 227 insertions(+), 31 deletions(-)
diff --git a/libscpi/src/utils.c b/libscpi/src/utils.c
index f69428d..6fa5ad7 100644
--- a/libscpi/src/utils.c
+++ b/libscpi/src/utils.c
@@ -98,15 +98,13 @@
case 8:
x = 0x40000000L;
break;
+ default:
case 10:
+ base = 10;
x = 1000000000L;
break;
case 16:
x = 0x10000000L;
- break;
- default:
- x = 1000000000L;
- base = 10;
break;
}
@@ -186,15 +184,13 @@
case 8:
x = 0x8000000000000000ULL;
break;
+ default:
case 10:
x = 10000000000000000000ULL;
+ base = 10;
break;
case 16:
x = 0x1000000000000000ULL;
- break;
- default:
- x = 10000000000000000000ULL;
- base = 10;
break;
}
@@ -253,7 +249,8 @@
* @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);
+ SCPIDEFINE_floatToStr(val, str, len);
+ return strlen(str);
}
/**
@@ -264,7 +261,8 @@
* @return number of bytes written to str (without '\0')
*/
size_t SCPI_DoubleToStr(double val, char * str, size_t len) {
- return SCPIDEFINE_doubleToStr(val, str, len);
+ SCPIDEFINE_doubleToStr(val, str, len);
+ return strlen(str);
}
/**
@@ -754,6 +752,145 @@
}
#endif
+#if USE_DEVICE_DEPENDENT_ERROR_INFORMATION && !USE_MEMORY_ALLOCATION_FREE
+
+/**
+ * Initialize heap structure
+ * @param heap - pointer to manual allocated heap buffer
+ * @param error_info_heap - buffer for the heap
+ * @param error_info_heap_length - length of the heap
+ */
+void scpiheap_init(scpi_error_info_heap_t * heap, char * error_info_heap, size_t error_info_heap_length)
+{
+ heap->data = error_info_heap;
+ heap->wr = 0;
+ heap->size = error_info_heap_length;
+ heap->count = heap->size;
+ memset(heap->data, 0, heap->size);
+}
+
+/**
+ * Duplicate string if "strdup" ("malloc/free") not supported on system.
+ * Allocate space in heap if it possible
+ *
+ * @param heap - pointer to manual allocated heap buffer
+ * @param s - current pointer of duplication string
+ * @return - pointer of duplicated string or NULL, if duplicate is not possible.
+ */
+char * scpiheap_strndup(scpi_error_info_heap_t * heap, const char *s, size_t n) {
+ if (!s || !heap || !heap->size) {
+ return NULL;
+ }
+
+ if (heap->data[heap->wr] != '\0') {
+ return NULL;
+ }
+
+ if (*s == '\0') {
+ return NULL;
+ }
+
+ size_t len = SCPIDEFINE_strnlen(s, n) + 1; // additional '\0' at end
+ if (len > heap->count) {
+ return NULL;
+ }
+ const char * ptrs = s;
+ char * head = &heap->data[heap->wr];
+ size_t rem = heap->size - (&heap->data[heap->wr] - heap->data);
+
+ if (len >= rem) {
+ memcpy(&heap->data[heap->wr], s, rem);
+ len = len - rem;
+ ptrs += rem;
+ heap->wr = 0;
+ heap->count -= rem;
+ }
+
+ memcpy(&heap->data[heap->wr], ptrs, len);
+ heap->wr += len;
+ heap->count -= len;
+
+ // ensure '\0' a the end
+ if (heap->wr > 0) {
+ heap->data[heap->wr - 1] = '\0';
+ } else {
+ heap->data[heap->size - 1] = '\0';
+ }
+ return head;
+}
+
+/**
+ * Return pointers and lengths two parts of string in the circular buffer from heap
+ *
+ * @param heap - pointer to manual allocated heap buffer
+ * @param s - pointer of duplicate string.
+ * @return len1 - lenght of first part of string.
+ * @return s2 - pointer of second part of string, if string splited .
+ * @return len2 - lenght of second part of string.
+ */
+scpi_bool_t scpiheap_get_parts(scpi_error_info_heap_t * heap, const char * s, size_t * len1, const char ** s2, size_t * len2) {
+ if (!heap || !s || !len1 || !s2 || !len2) {
+ return FALSE;
+ }
+
+ if (*s == '\0') {
+ return FALSE;
+ }
+
+ *len1 = 0;
+ size_t rem = heap->size - (s - heap->data);
+ *len1 = strnlen(s, rem);
+
+ if (&s[*len1 - 1] == &heap->data[heap->size - 1]) {
+ *s2 = heap->data;
+ *len2 = strnlen(*s2, heap->size);
+ } else {
+ *s2 = NULL;
+ *len2 = 0;
+ }
+ return TRUE;
+}
+
+/**
+ * Frees space in heap, if "malloc/free" not supported on system, or nothing.
+ *
+ * @param heap - pointer to manual allocated heap buffer
+ * @param s - pointer of duplicate string
+ * @param rollback - backward write pointer in heap
+ */
+void scpiheap_free(scpi_error_info_heap_t * heap, char * s, scpi_bool_t rollback) {
+
+ if (!s) return;
+
+ char * data_add;
+ size_t len[2];
+
+ if (!scpiheap_get_parts(heap, s, &len[0], (const char **)&data_add, &len[1])) return;
+
+ if (data_add) {
+ len[1]++;
+ memset(data_add, 0, len[1]);
+ heap->count += len[1];
+ } else {
+ len[0]++;
+ }
+ memset(s, 0, len[0]);
+ heap->count += len[0];
+ if (heap->count == heap->size) {
+ heap->wr = 0;
+ return;
+ }
+ if (rollback) {
+ size_t rb = len[0] + len[1];
+ if (rb > heap->wr) {
+ heap->wr += heap->size;
+ }
+ heap->wr -= rb;
+ }
+}
+
+#endif
+
// Floating point to string conversion routines
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
@@ -784,67 +921,74 @@
// SUCH DAMAGE.
static char *scpi_ecvt(double arg, int ndigits, int *decpt, int *sign, char *buf, size_t bufsize) {
- int r2;
+ int r1, r2;
double fi, fj;
- char *p, *p1;
+ int w1, w2;
if (ndigits < 0) ndigits = 0;
if (ndigits >= (int) (bufsize - 1)) ndigits = bufsize - 2;
+
r2 = 0;
*sign = 0;
- p = &buf[0];
+ w1 = 0;
if (arg < 0) {
*sign = 1;
arg = -arg;
}
+ frexp(arg, &r1);
arg = modf(arg, &fi);
- p1 = &buf[bufsize];
if (fi != 0) {
- p1 = &buf[bufsize];
+ r1 = r1 * 308 / 1024 - ndigits;
+ w2 = bufsize;
+ while (r1 > 0) {
+ fj = modf(fi / 10, &fi);
+ r2++;
+ r1--;
+ }
while (fi != 0) {
fj = modf(fi / 10, &fi);
- *--p1 = (int) ((fj + .03) * 10) + '0';
+ buf[--w2] = (int) ((fj + .03) * 10) + '0';
r2++;
}
- while (p1 < &buf[bufsize]) *p++ = *p1++;
+ while (w2 < (int) bufsize) buf[w1++] = buf[w2++];
} else if (arg > 0) {
while ((fj = arg * 10) < 1) {
arg = fj;
r2--;
}
}
- p1 = &buf[ndigits];
+ w2 = ndigits;
*decpt = r2;
- if (p1 < &buf[0]) {
+ if (w2 < 0) {
buf[0] = '\0';
return buf;
}
- while (p <= p1 && p < &buf[bufsize]) {
+ while (w1 <= w2 && w1 < (int) bufsize) {
arg *= 10;
arg = modf(arg, &fj);
- *p++ = (int) fj + '0';
+ buf[w1++] = (int) fj + '0';
}
- if (p1 >= &buf[bufsize]) {
+ if (w2 >= (int) bufsize) {
buf[bufsize - 1] = '\0';
return buf;
}
- p = p1;
- *p1 += 5;
- while (*p1 > '9') {
- *p1 = '0';
- if (p1 > buf) {
- ++*--p1;
+ w1 = w2;
+ buf[w2] += 5;
+ while (buf[w2] > '9') {
+ buf[w2] = '0';
+ if (w2 > 0) {
+ ++buf[--w2];
} else {
- *p1 = '1';
+ buf[w2] = '1';
(*decpt)++;
}
}
- *p = '\0';
+ buf[w1] = '\0';
return buf;
}
-#define SCPI_DTOSTRE_BUFFER_SIZE 310
+#define SCPI_DTOSTRE_BUFFER_SIZE 32
char * SCPI_dtostre(double __val, char * __s, size_t __ssize, unsigned char __prec, unsigned char __flags) {
char buffer[SCPI_DTOSTRE_BUFFER_SIZE];
@@ -928,3 +1072,55 @@
strncpy(__s, buffer, __ssize);
return __s;
}
+
+/**
+ * Get native CPU endiannes
+ * @return
+ */
+scpi_array_format_t SCPI_GetNativeFormat(void) {
+
+ union {
+ uint32_t i;
+ char c[4];
+ } bint = {0x01020304};
+
+ return bint.c[0] == 1 ? SCPI_FORMAT_BIGENDIAN : SCPI_FORMAT_LITTLEENDIAN;
+}
+
+/**
+ * Swap 16bit number
+ * @param val
+ * @return
+ */
+uint16_t SCPI_Swap16(uint16_t val) {
+ return ((val & 0x00FF) << 8) |
+ ((val & 0xFF00) >> 8);
+}
+
+/**
+ * Swap 32bit number
+ * @param val
+ * @return
+ */
+uint32_t SCPI_Swap32(uint32_t val) {
+ return ((val & 0x000000FF) << 24) |
+ ((val & 0x0000FF00) << 8) |
+ ((val & 0x00FF0000) >> 8) |
+ ((val & 0xFF000000) >> 24);
+}
+
+/**
+ * Swap 64bit number
+ * @param val
+ * @return
+ */
+uint64_t SCPI_Swap64(uint64_t val) {
+ return ((val & 0x00000000000000FFul) << 56) |
+ ((val & 0x000000000000FF00ul) << 40) |
+ ((val & 0x0000000000FF0000ul) << 24) |
+ ((val & 0x00000000FF000000ul) << 8) |
+ ((val & 0x000000FF00000000ul) >> 8) |
+ ((val & 0x0000FF0000000000ul) >> 24) |
+ ((val & 0x00FF000000000000ul) >> 40) |
+ ((val & 0xFF00000000000000ul) >> 56);
+}
--
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