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-rw-r--r--wsutil/to_str.c989
1 files changed, 989 insertions, 0 deletions
diff --git a/wsutil/to_str.c b/wsutil/to_str.c
new file mode 100644
index 0000000..d15576d
--- /dev/null
+++ b/wsutil/to_str.c
@@ -0,0 +1,989 @@
+/* wsutil/to_str.c
+ * Routines for utilities to convert various other types to strings.
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+#include "to_str.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+#include <wsutil/utf8_entities.h>
+#include <wsutil/wslog.h>
+#include <wsutil/inet_addr.h>
+#include <wsutil/pint.h>
+#include <wsutil/time_util.h>
+
+/*
+ * If a user _does_ pass in a too-small buffer, this is probably
+ * going to be too long to fit. However, even a partial string
+ * starting with "[Buf" should provide enough of a clue to be
+ * useful.
+ */
+#define _return_if_nospace(str_len, buf, buf_len) \
+ do { \
+ if ((str_len) > (buf_len)) { \
+ (void)g_strlcpy(buf, "[Buffer too small]", buf_len); \
+ return; \
+ } \
+ } while (0)
+
+static const char fast_strings[][4] = {
+ "0", "1", "2", "3", "4", "5", "6", "7",
+ "8", "9", "10", "11", "12", "13", "14", "15",
+ "16", "17", "18", "19", "20", "21", "22", "23",
+ "24", "25", "26", "27", "28", "29", "30", "31",
+ "32", "33", "34", "35", "36", "37", "38", "39",
+ "40", "41", "42", "43", "44", "45", "46", "47",
+ "48", "49", "50", "51", "52", "53", "54", "55",
+ "56", "57", "58", "59", "60", "61", "62", "63",
+ "64", "65", "66", "67", "68", "69", "70", "71",
+ "72", "73", "74", "75", "76", "77", "78", "79",
+ "80", "81", "82", "83", "84", "85", "86", "87",
+ "88", "89", "90", "91", "92", "93", "94", "95",
+ "96", "97", "98", "99", "100", "101", "102", "103",
+ "104", "105", "106", "107", "108", "109", "110", "111",
+ "112", "113", "114", "115", "116", "117", "118", "119",
+ "120", "121", "122", "123", "124", "125", "126", "127",
+ "128", "129", "130", "131", "132", "133", "134", "135",
+ "136", "137", "138", "139", "140", "141", "142", "143",
+ "144", "145", "146", "147", "148", "149", "150", "151",
+ "152", "153", "154", "155", "156", "157", "158", "159",
+ "160", "161", "162", "163", "164", "165", "166", "167",
+ "168", "169", "170", "171", "172", "173", "174", "175",
+ "176", "177", "178", "179", "180", "181", "182", "183",
+ "184", "185", "186", "187", "188", "189", "190", "191",
+ "192", "193", "194", "195", "196", "197", "198", "199",
+ "200", "201", "202", "203", "204", "205", "206", "207",
+ "208", "209", "210", "211", "212", "213", "214", "215",
+ "216", "217", "218", "219", "220", "221", "222", "223",
+ "224", "225", "226", "227", "228", "229", "230", "231",
+ "232", "233", "234", "235", "236", "237", "238", "239",
+ "240", "241", "242", "243", "244", "245", "246", "247",
+ "248", "249", "250", "251", "252", "253", "254", "255"
+};
+
+static inline char
+low_nibble_of_octet_to_hex(uint8_t oct)
+{
+ /* At least one version of Apple's C compiler/linker is buggy, causing
+ a complaint from the linker about the "literal C string section"
+ not ending with '\0' if we initialize a 16-element "char" array with
+ a 16-character string, the fact that initializing such an array with
+ such a string is perfectly legitimate ANSI C nonwithstanding, the 17th
+ '\0' byte in the string nonwithstanding. */
+ static const char hex_digits[16] =
+ { '0', '1', '2', '3', '4', '5', '6', '7',
+ '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
+
+ return hex_digits[oct & 0xF];
+}
+
+static inline char *
+byte_to_hex(char *out, uint32_t dword)
+{
+ *out++ = low_nibble_of_octet_to_hex(dword >> 4);
+ *out++ = low_nibble_of_octet_to_hex(dword);
+ return out;
+}
+
+char *
+guint8_to_hex(char *out, uint8_t val)
+{
+ return byte_to_hex(out, val);
+}
+
+char *
+word_to_hex(char *out, uint16_t word)
+{
+ out = byte_to_hex(out, word >> 8);
+ out = byte_to_hex(out, word);
+ return out;
+}
+
+char *
+word_to_hex_punct(char *out, uint16_t word, char punct)
+{
+ out = byte_to_hex(out, word >> 8);
+ *out++ = punct;
+ out = byte_to_hex(out, word);
+ return out;
+}
+
+char *
+word_to_hex_npad(char *out, uint16_t word)
+{
+ if (word >= 0x1000)
+ *out++ = low_nibble_of_octet_to_hex((uint8_t)(word >> 12));
+ if (word >= 0x0100)
+ *out++ = low_nibble_of_octet_to_hex((uint8_t)(word >> 8));
+ if (word >= 0x0010)
+ *out++ = low_nibble_of_octet_to_hex((uint8_t)(word >> 4));
+ *out++ = low_nibble_of_octet_to_hex((uint8_t)(word >> 0));
+ return out;
+}
+
+char *
+dword_to_hex(char *out, uint32_t dword)
+{
+ out = word_to_hex(out, dword >> 16);
+ out = word_to_hex(out, dword);
+ return out;
+}
+
+char *
+dword_to_hex_punct(char *out, uint32_t dword, char punct)
+{
+ out = word_to_hex_punct(out, dword >> 16, punct);
+ *out++ = punct;
+ out = word_to_hex_punct(out, dword, punct);
+ return out;
+}
+
+char *
+qword_to_hex(char *out, uint64_t qword)
+{
+ out = dword_to_hex(out, (uint32_t)(qword >> 32));
+ out = dword_to_hex(out, (uint32_t)(qword & 0xffffffff));
+ return out;
+}
+
+char *
+qword_to_hex_punct(char *out, uint64_t qword, char punct)
+{
+ out = dword_to_hex_punct(out, (uint32_t)(qword >> 32), punct);
+ *out++ = punct;
+ out = dword_to_hex_punct(out, (uint32_t)(qword & 0xffffffff), punct);
+ return out;
+}
+
+/*
+ * This does *not* null-terminate the string. It returns a pointer
+ * to the position in the string following the last character it
+ * puts there, so that the caller can either put the null terminator
+ * in or can append more stuff to the buffer.
+ *
+ * There needs to be at least len * 2 bytes left in the buffer.
+ */
+char *
+bytes_to_hexstr(char *out, const uint8_t *ad, size_t len)
+{
+ size_t i;
+
+ ws_return_val_if(!ad, NULL);
+
+ for (i = 0; i < len; i++)
+ out = byte_to_hex(out, ad[i]);
+ return out;
+}
+
+/*
+ * This does *not* null-terminate the string. It returns a pointer
+ * to the position in the string following the last character it
+ * puts there, so that the caller can either put the null terminator
+ * in or can append more stuff to the buffer.
+ *
+ * There needs to be at least len * 3 - 1 bytes left in the buffer.
+ */
+char *
+bytes_to_hexstr_punct(char *out, const uint8_t *ad, size_t len, char punct)
+{
+ size_t i;
+
+ ws_return_val_if(!ad, NULL);
+
+ out = byte_to_hex(out, ad[0]);
+ for (i = 1; i < len; i++) {
+ *out++ = punct;
+ out = byte_to_hex(out, ad[i]);
+ }
+ return out;
+}
+
+/* Routine to convert a sequence of bytes to a hex string, one byte/two hex
+ * digits at a time, with a specified punctuation character between
+ * the bytes.
+ *
+ * If punct is '\0', no punctuation is applied (and thus
+ * the resulting string is (len-1) bytes shorter)
+ */
+char *
+bytes_to_str_punct_maxlen(wmem_allocator_t *scope,
+ const uint8_t *src, size_t src_size,
+ char punct, size_t max_bytes_len)
+{
+ char *buf;
+ size_t max_char_size;
+ char *buf_ptr;
+ int truncated = 0;
+
+ ws_return_str_if(!src, scope);
+ ws_return_str_if(!src_size, scope);
+
+ if (!punct)
+ return bytes_to_str_maxlen(scope, src, src_size, max_bytes_len);
+
+ if (max_bytes_len == 0 || max_bytes_len > src_size) {
+ max_bytes_len = src_size;
+ }
+ else if (max_bytes_len < src_size) {
+ truncated = 1;
+ }
+
+ /* Include space for ellipsis and '\0'. Optional extra punct
+ * at the end is already accounted for. */
+ max_char_size = max_bytes_len * 3 + strlen(UTF8_HORIZONTAL_ELLIPSIS) + 1;
+
+ buf = wmem_alloc(scope, max_char_size);
+ buf_ptr = bytes_to_hexstr_punct(buf, src, max_bytes_len, punct);
+
+ if (truncated) {
+ *buf_ptr++ = punct;
+ buf_ptr = g_stpcpy(buf_ptr, UTF8_HORIZONTAL_ELLIPSIS);
+ }
+
+ *buf_ptr = '\0';
+ return buf;
+}
+
+char *
+bytes_to_str_maxlen(wmem_allocator_t *scope,
+ const uint8_t *src, size_t src_size,
+ size_t max_bytes_len)
+{
+ char *buf;
+ size_t max_char_size;
+ char *buf_ptr;
+ int truncated = 0;
+
+ ws_return_str_if(!src, scope);
+ ws_return_str_if(!src_size, scope);
+
+ if (max_bytes_len == 0 || max_bytes_len > src_size) {
+ max_bytes_len = src_size;
+ }
+ else if (max_bytes_len < src_size) {
+ truncated = 1;
+ }
+
+ max_char_size = max_bytes_len * 2 + strlen(UTF8_HORIZONTAL_ELLIPSIS) + 1;
+
+ buf = wmem_alloc(scope, max_char_size);
+ buf_ptr = bytes_to_hexstr(buf, src, max_bytes_len);
+
+ if (truncated)
+ buf_ptr = g_stpcpy(buf_ptr, UTF8_HORIZONTAL_ELLIPSIS);
+
+ *buf_ptr = '\0';
+ return buf;
+}
+
+/*
+ * The *_to_str_back() functions measured approx. a x7.5 speed-up versus
+ * snprintf() on my Linux system with GNU libc.
+ */
+
+char *
+oct_to_str_back(char *ptr, uint32_t value)
+{
+ while (value) {
+ *(--ptr) = '0' + (value & 0x7);
+ value >>= 3;
+ }
+
+ *(--ptr) = '0';
+ return ptr;
+}
+
+char *
+oct64_to_str_back(char *ptr, uint64_t value)
+{
+ while (value) {
+ *(--ptr) = '0' + (value & 0x7);
+ value >>= 3;
+ }
+
+ *(--ptr) = '0';
+ return ptr;
+}
+
+char *
+hex_to_str_back_len(char *ptr, uint32_t value, int len)
+{
+ do {
+ *(--ptr) = low_nibble_of_octet_to_hex(value);
+ value >>= 4;
+ len--;
+ } while (value);
+
+ /* pad */
+ while (len > 0) {
+ *(--ptr) = '0';
+ len--;
+ }
+
+ *(--ptr) = 'x';
+ *(--ptr) = '0';
+
+ return ptr;
+}
+
+char *
+hex64_to_str_back_len(char *ptr, uint64_t value, int len)
+{
+ do {
+ *(--ptr) = low_nibble_of_octet_to_hex(value & 0xF);
+ value >>= 4;
+ len--;
+ } while (value);
+
+ /* pad */
+ while (len > 0) {
+ *(--ptr) = '0';
+ len--;
+ }
+
+ *(--ptr) = 'x';
+ *(--ptr) = '0';
+
+ return ptr;
+}
+
+char *
+uint_to_str_back(char *ptr, uint32_t value)
+{
+ char const *p;
+
+ /* special case */
+ if (value == 0)
+ *(--ptr) = '0';
+
+ while (value >= 10) {
+ p = fast_strings[100 + (value % 100)];
+
+ value /= 100;
+
+ *(--ptr) = p[2];
+ *(--ptr) = p[1];
+ }
+
+ if (value)
+ *(--ptr) = (value) | '0';
+
+ return ptr;
+}
+
+char *
+uint64_to_str_back(char *ptr, uint64_t value)
+{
+ char const *p;
+
+ /* special case */
+ if (value == 0)
+ *(--ptr) = '0';
+
+ while (value >= 10) {
+ p = fast_strings[100 + (value % 100)];
+
+ value /= 100;
+
+ *(--ptr) = p[2];
+ *(--ptr) = p[1];
+ }
+
+ /* value will be 0..9, so using '& 0xF' is safe, and faster than '% 10' */
+ if (value)
+ *(--ptr) = (value & 0xF) | '0';
+
+ return ptr;
+}
+
+char *
+uint_to_str_back_len(char *ptr, uint32_t value, int len)
+{
+ char *new_ptr;
+
+ new_ptr = uint_to_str_back(ptr, value);
+
+ /* substract from len number of generated characters */
+ len -= (int)(ptr - new_ptr);
+
+ /* pad remaining with '0' */
+ while (len > 0)
+ {
+ *(--new_ptr) = '0';
+ len--;
+ }
+
+ return new_ptr;
+}
+
+char *
+uint64_to_str_back_len(char *ptr, uint64_t value, int len)
+{
+ char *new_ptr;
+
+ new_ptr = uint64_to_str_back(ptr, value);
+
+ /* substract from len number of generated characters */
+ len -= (int)(ptr - new_ptr);
+
+ /* pad remaining with '0' */
+ while (len > 0)
+ {
+ *(--new_ptr) = '0';
+ len--;
+ }
+
+ return new_ptr;
+}
+
+char *
+int_to_str_back(char *ptr, int32_t value)
+{
+ if (value < 0) {
+ ptr = uint_to_str_back(ptr, -value);
+ *(--ptr) = '-';
+ } else
+ ptr = uint_to_str_back(ptr, value);
+
+ return ptr;
+}
+
+char *
+int64_to_str_back(char *ptr, int64_t value)
+{
+ if (value < 0) {
+ ptr = uint64_to_str_back(ptr, -value);
+ *(--ptr) = '-';
+ } else
+ ptr = uint64_to_str_back(ptr, value);
+
+ return ptr;
+}
+
+static size_t
+guint32_to_str_buf_len(const uint32_t u)
+{
+ /* ((2^32)-1) == 2147483647 */
+ if (u >= 1000000000)return 10;
+ if (u >= 100000000) return 9;
+ if (u >= 10000000) return 8;
+ if (u >= 1000000) return 7;
+ if (u >= 100000) return 6;
+ if (u >= 10000) return 5;
+ if (u >= 1000) return 4;
+ if (u >= 100) return 3;
+ if (u >= 10) return 2;
+
+ return 1;
+}
+
+void
+guint32_to_str_buf(uint32_t u, char *buf, size_t buf_len)
+{
+ size_t str_len = guint32_to_str_buf_len(u)+1;
+
+ char *bp = &buf[str_len];
+
+ _return_if_nospace(str_len, buf, buf_len);
+
+ *--bp = '\0';
+
+ uint_to_str_back(bp, u);
+}
+
+static size_t
+guint64_to_str_buf_len(const uint64_t u)
+{
+ /* ((2^64)-1) == 18446744073709551615 */
+
+ if (u >= G_GUINT64_CONSTANT(10000000000000000000)) return 20;
+ if (u >= G_GUINT64_CONSTANT(1000000000000000000)) return 19;
+ if (u >= G_GUINT64_CONSTANT(100000000000000000)) return 18;
+ if (u >= G_GUINT64_CONSTANT(10000000000000000)) return 17;
+ if (u >= G_GUINT64_CONSTANT(1000000000000000)) return 16;
+ if (u >= G_GUINT64_CONSTANT(100000000000000)) return 15;
+ if (u >= G_GUINT64_CONSTANT(10000000000000)) return 14;
+ if (u >= G_GUINT64_CONSTANT(1000000000000)) return 13;
+ if (u >= G_GUINT64_CONSTANT(100000000000)) return 12;
+ if (u >= G_GUINT64_CONSTANT(10000000000)) return 11;
+ if (u >= G_GUINT64_CONSTANT(1000000000)) return 10;
+ if (u >= G_GUINT64_CONSTANT(100000000)) return 9;
+ if (u >= G_GUINT64_CONSTANT(10000000)) return 8;
+ if (u >= G_GUINT64_CONSTANT(1000000)) return 7;
+ if (u >= G_GUINT64_CONSTANT(100000)) return 6;
+ if (u >= G_GUINT64_CONSTANT(10000)) return 5;
+ if (u >= G_GUINT64_CONSTANT(1000)) return 4;
+ if (u >= G_GUINT64_CONSTANT(100)) return 3;
+ if (u >= G_GUINT64_CONSTANT(10)) return 2;
+
+ return 1;
+}
+
+void
+guint64_to_str_buf(uint64_t u, char *buf, size_t buf_len)
+{
+ size_t str_len = guint64_to_str_buf_len(u)+1;
+
+ char *bp = &buf[str_len];
+
+ _return_if_nospace(str_len, buf, buf_len);
+
+ *--bp = '\0';
+
+ uint64_to_str_back(bp, u);
+}
+
+/*
+ This function is very fast and this function is called a lot.
+ XXX update the address_to_str stuff to use this function.
+ */
+void
+ip_to_str_buf(const uint8_t *ad, char *buf, const int buf_len)
+{
+ register char const *p;
+ register char *b=buf;
+
+ _return_if_nospace(WS_INET_ADDRSTRLEN, buf, buf_len);
+
+ p=fast_strings[*ad++];
+ do {
+ *b++=*p;
+ p++;
+ } while(*p);
+ *b++='.';
+
+ p=fast_strings[*ad++];
+ do {
+ *b++=*p;
+ p++;
+ } while(*p);
+ *b++='.';
+
+ p=fast_strings[*ad++];
+ do {
+ *b++=*p;
+ p++;
+ } while(*p);
+ *b++='.';
+
+ p=fast_strings[*ad];
+ do {
+ *b++=*p;
+ p++;
+ } while(*p);
+ *b=0;
+}
+
+char *ip_to_str(wmem_allocator_t *scope, const uint8_t *ad)
+{
+ char *buf = wmem_alloc(scope, WS_INET_ADDRSTRLEN * sizeof(char));
+
+ ip_to_str_buf(ad, buf, WS_INET_ADDRSTRLEN);
+
+ return buf;
+}
+
+void
+ip6_to_str_buf(const ws_in6_addr *addr, char *buf, size_t buf_size)
+{
+ /*
+ * If there is not enough space then ws_inet_ntop6() will leave
+ * an error message in the buffer, we don't need
+ * to use _return_if_nospace().
+ */
+ ws_inet_ntop6(addr, buf, (unsigned)buf_size);
+}
+
+char *ip6_to_str(wmem_allocator_t *scope, const ws_in6_addr *ad)
+{
+ char *buf = wmem_alloc(scope, WS_INET6_ADDRSTRLEN * sizeof(char));
+
+ ws_inet_ntop6(ad, buf, WS_INET6_ADDRSTRLEN);
+
+ return buf;
+}
+
+char *
+ipxnet_to_str_punct(wmem_allocator_t *allocator, const uint32_t ad, const char punct)
+{
+ char *buf = (char *)wmem_alloc(allocator, 12);
+
+ *dword_to_hex_punct(buf, ad, punct) = '\0';
+ return buf;
+}
+
+#define WS_EUI64_STRLEN 24
+
+char *
+eui64_to_str(wmem_allocator_t *scope, const uint64_t ad) {
+ char *buf, *tmp;
+ uint8_t *p_eui64;
+
+ p_eui64=(uint8_t *)wmem_alloc(NULL, 8);
+ buf=(char *)wmem_alloc(scope, WS_EUI64_STRLEN);
+
+ /* Copy and convert the address to network byte order. */
+ *(uint64_t *)(void *)(p_eui64) = pntoh64(&(ad));
+
+ tmp = bytes_to_hexstr_punct(buf, p_eui64, 8, ':');
+ *tmp = '\0'; /* NULL terminate */
+ wmem_free(NULL, p_eui64);
+ return buf;
+}
+
+/*
+ * Number of characters required by a 64-bit signed number.
+ */
+#define CHARS_64_BIT_SIGNED 20 /* sign plus 19 digits */
+
+/*
+ * Number of characters required by a fractional part, in nanoseconds,
+ * not counting the decimal point.
+ */
+#define CHARS_NANOSECONDS 9 /* 000000001 */
+
+/*
+ * Format the fractional part of a time, with the specified precision.
+ * Returns the number of bytes formatted.
+ */
+int
+format_fractional_part_nsecs(char *buf, size_t buflen, uint32_t nsecs, const char *decimal_point, int precision)
+{
+ char *ptr;
+ size_t remaining;
+ int num_bytes;
+ size_t decimal_point_len;
+ uint32_t frac_part;
+ int8_t num_buf[CHARS_NANOSECONDS];
+ int8_t *num_end = &num_buf[CHARS_NANOSECONDS];
+ int8_t *num_ptr;
+ size_t num_len;
+
+ ws_assert(precision != 0);
+
+ if (buflen == 0) {
+ /*
+ * No room in the buffer for anything, including
+ * a terminating '\0'.
+ */
+ return 0;
+ }
+
+ /*
+ * If the fractional part is >= 1, don't show it as a
+ * fractional part.
+ */
+ if (nsecs >= 1000000000U) {
+ num_bytes = snprintf(buf, buflen, "%s(%u nanoseconds)",
+ decimal_point, nsecs);
+ if ((unsigned int)num_bytes >= buflen) {
+ /*
+ * That filled up or would have overflowed
+ * the buffer. Nothing more to do; return
+ * the remaining space in the buffer, minus
+ * one byte for the terminating '\0',* as
+ * that's the number of bytes we copied.
+ */
+ return (int)(buflen - 1);
+ }
+ return num_bytes;
+ }
+
+ ptr = buf;
+ remaining = buflen;
+ num_bytes = 0;
+
+ /*
+ * Copy the decimal point.
+ * (We assume here that the locale's decimal point does
+ * not contain so many characters that its size doesn't
+ * fit in an int. :-))
+ */
+ decimal_point_len = g_strlcpy(buf, decimal_point, buflen);
+ if (decimal_point_len >= buflen) {
+ /*
+ * The decimal point didn't fit in the buffer
+ * and was truncated. Nothing more to do;
+ * return the remaining space in the buffer,
+ * minus one byte for the terminating '\0',
+ * as that's the number of bytes we copied.
+ */
+ return (int)(buflen - 1);
+ }
+ ptr += decimal_point_len;
+ remaining -= decimal_point_len;
+ num_bytes += (int)decimal_point_len;
+
+ /*
+ * Fill in num_buf with the nanoseconds value, padded with
+ * leading zeroes, to the specified precision.
+ *
+ * We scale the fractional part in advance, as that just
+ * takes one division by a constant (which may be
+ * optimized to a faster multiplication by a constant)
+ * and gets rid of some divisions and remainders by 100
+ * done to generate the digits.
+ *
+ * We pass preciions as the last argument to
+ * uint_to_str_back_len(), as that might mean that
+ * all of the cases end up using common code to
+ * do part of the call to uint_to_str_back_len().
+ */
+ switch (precision) {
+
+ case 1:
+ /*
+ * Scale down to units of 1/10 second.
+ */
+ frac_part = nsecs / 100000000U;
+ break;
+
+ case 2:
+ /*
+ * Scale down to units of 1/100 second.
+ */
+ frac_part = nsecs / 10000000U;
+ break;
+
+ case 3:
+ /*
+ * Scale down to units of 1/1000 second.
+ */
+ frac_part = nsecs / 1000000U;
+ break;
+
+ case 4:
+ /*
+ * Scale down to units of 1/10000 second.
+ */
+ frac_part = nsecs / 100000U;
+ break;
+
+ case 5:
+ /*
+ * Scale down to units of 1/100000 second.
+ */
+ frac_part = nsecs / 10000U;
+ break;
+
+ case 6:
+ /*
+ * Scale down to units of 1/1000000 second.
+ */
+ frac_part = nsecs / 1000U;
+ break;
+
+ case 7:
+ /*
+ * Scale down to units of 1/10000000 second.
+ */
+ frac_part = nsecs / 100U;
+ break;
+
+ case 8:
+ /*
+ * Scale down to units of 1/100000000 second.
+ */
+ frac_part = nsecs / 10U;
+ break;
+
+ case 9:
+ /*
+ * We're already in units of 1/1000000000 second.
+ */
+ frac_part = nsecs;
+ break;
+
+ default:
+ ws_assert_not_reached();
+ break;
+ }
+
+ num_ptr = uint_to_str_back_len(num_end, frac_part, precision);
+
+ /*
+ * The length of the string that we want to copy to the buffer
+ * is the minimum of:
+ *
+ * the length of the digit string;
+ * the remaining space in the buffer, minus 1 for the
+ * terminating '\0'.
+ */
+ num_len = MIN((size_t)(num_end - num_ptr), remaining - 1);
+ if (num_len == 0) {
+ /*
+ * Not enough room to copy anything.
+ * Return the number of bytes we've generated.
+ */
+ return num_bytes;
+ }
+
+ /*
+ * Copy over the fractional part.
+ * (We assume here that the fractional part does not contain
+ * so many characters that its size doesn't fit in an int. :-))
+ */
+ memcpy(ptr, num_ptr, num_len);
+ ptr += num_len;
+ num_bytes += (int)num_len;
+
+ /*
+ * '\0'-terminate it.
+ */
+ *ptr = '\0';
+ return num_bytes;
+}
+
+void
+display_epoch_time(char *buf, size_t buflen, const nstime_t *ns, int precision)
+{
+ display_signed_time(buf, buflen, ns, precision);
+}
+
+void
+display_signed_time(char *buf, size_t buflen, const nstime_t *ns, int precision)
+{
+ int nsecs;
+ /* this buffer is not NUL terminated */
+ int8_t num_buf[CHARS_64_BIT_SIGNED];
+ int8_t *num_end = &num_buf[CHARS_64_BIT_SIGNED];
+ int8_t *num_ptr;
+ size_t num_len;
+
+ if (buflen < 1)
+ return;
+
+ /* If the fractional part of the time stamp is negative,
+ print its absolute value and, if the seconds part isn't
+ (the seconds part should be zero in that case), stick
+ a "-" in front of the entire time stamp. */
+ nsecs = ns->nsecs;
+ if (nsecs < 0) {
+ nsecs = -nsecs;
+ if (ns->secs >= 0) {
+ buf[0] = '-';
+ buf++;
+ buflen--;
+ }
+ }
+
+ /*
+ * Fill in num_buf with the seconds value.
+ */
+ num_ptr = int64_to_str_back(num_end, ns->secs);
+
+ /*
+ * The length of the string that we want to copy to the buffer
+ * is the minimum of:
+ *
+ * the length of the digit string;
+ * the size of the buffer, minus 1 for the terminating
+ * '\0'.
+ */
+ num_len = MIN((size_t)(num_end - num_ptr), buflen - 1);
+ if (num_len == 0) {
+ /*
+ * Not enough room to copy anything.
+ */
+ return;
+ }
+
+ /*
+ * Copy over the seconds value.
+ */
+ memcpy(buf, num_ptr, num_len);
+ buf += num_len;
+ buflen -= num_len;
+
+ if (precision == 0) {
+ /*
+ * Seconds precision, so no nanosecond.
+ * Nothing more to do other than to
+ * '\0'-terminate the string.
+ */
+ *buf = '\0';
+ return;
+ }
+
+ /*
+ * Append the fractional part.
+ */
+ format_fractional_part_nsecs(buf, buflen, (uint32_t)nsecs, ".", precision);
+}
+
+void
+format_nstime_as_iso8601(char *buf, size_t buflen, const nstime_t *ns,
+ char *decimal_point, bool local, int precision)
+{
+ struct tm tm, *tmp;
+ char *ptr;
+ size_t remaining;
+ int num_bytes;
+
+ if (local)
+ tmp = ws_localtime_r(&ns->secs, &tm);
+ else
+ tmp = ws_gmtime_r(&ns->secs, &tm);
+ if (tmp == NULL) {
+ snprintf(buf, buflen, "Not representable");
+ return;
+ }
+ ptr = buf;
+ remaining = buflen;
+ num_bytes = snprintf(ptr, remaining,
+ "%04d-%02d-%02d %02d:%02d:%02d",
+ tmp->tm_year + 1900,
+ tmp->tm_mon + 1,
+ tmp->tm_mday,
+ tmp->tm_hour,
+ tmp->tm_min,
+ tmp->tm_sec);
+ if (num_bytes < 0) {
+ /*
+ * That got an error.
+ * Not much else we can do.
+ */
+ snprintf(buf, buflen, "snprintf() failed");
+ return;
+ }
+ if ((unsigned int)num_bytes >= remaining) {
+ /*
+ * That filled up or would have overflowed the buffer.
+ * Nothing more we can do.
+ */
+ return;
+ }
+ ptr += num_bytes;
+ remaining -= num_bytes;
+
+ if (precision != 0) {
+ /*
+ * Append the fractional part.
+ * Get the nsecs as a 32-bit unsigned value, as it should
+ * never be negative, so we treat it as unsigned.
+ */
+ format_fractional_part_nsecs(ptr, remaining, (uint32_t)ns->nsecs, decimal_point, precision);
+ }
+}
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */
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