+volatile sig_atomic_t netdata_exit = 0;
+
+// ----------------------------------------------------------------------------
+// memory allocation functions that handle failures
+
+// although netdata does not use memory allocations too often (netdata tries to
+// maintain its memory footprint stable during runtime, i.e. all buffers are
+// allocated during initialization and are adapted to current use throughout
+// its lifetime), these can be used to override the default system allocation
+// routines.
+
+#ifdef NETDATA_LOG_ALLOCATIONS
+static struct memory_statistics {
+ volatile size_t malloc_calls_made;
+ volatile size_t calloc_calls_made;
+ volatile size_t realloc_calls_made;
+ volatile size_t strdup_calls_made;
+ volatile size_t free_calls_made;
+ volatile size_t memory_calls_made;
+ volatile size_t allocated_memory;
+ volatile size_t mmapped_memory;
+} memory_statistics;
+
+static inline void print_allocations(const char *file, const char *function, const unsigned long line) {
+ static struct memory_statistics old = { 0, 0, 0, 0, 0, 0, 0, 0 };
+
+ //if(unlikely(!(memory_statistics.memory_calls_made % 5))) {
+ fprintf(stderr, "(%04lu@%-10.10s:%-15.15s): Allocated %zu KB (+%zu B), mmapped %zu KB (+%zu B): malloc %zu (+%zu), calloc %zu (+%zu), realloc %zu (+%zu), strdup %zu (+%zu), free %zu (+%zu)\n",
+ line, file, function,
+ (memory_statistics.allocated_memory + 512) / 1024, memory_statistics.allocated_memory - old.allocated_memory,
+ (memory_statistics.mmapped_memory + 512) / 1024, memory_statistics.mmapped_memory - old.mmapped_memory,
+ memory_statistics.malloc_calls_made, memory_statistics.malloc_calls_made - old.malloc_calls_made,
+ memory_statistics.calloc_calls_made, memory_statistics.calloc_calls_made - old.calloc_calls_made,
+ memory_statistics.realloc_calls_made, memory_statistics.realloc_calls_made - old.realloc_calls_made,
+ memory_statistics.strdup_calls_made, memory_statistics.strdup_calls_made - old.strdup_calls_made,
+ memory_statistics.free_calls_made, memory_statistics.free_calls_made - old.free_calls_made
+ );
+
+ memcpy(&old, &memory_statistics, sizeof(struct memory_statistics));
+ //}
+}
+
+static inline void malloc_accounting(const char *file, const char *function, const unsigned long line, size_t size) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+ __atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.malloc_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.allocated_memory, size, __ATOMIC_SEQ_CST);
+#else
+ // this is for debugging - we don't care locking it
+ memory_statistics.memory_calls_made++;
+ memory_statistics.malloc_calls_made++;
+ memory_statistics.allocated_memory += size;
+#endif
+ print_allocations(file, function, line);
+}
+
+static inline void mmap_accounting(size_t size) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+ __atomic_fetch_add(&memory_statistics.malloc_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.mmapped_memory, size, __ATOMIC_SEQ_CST);
+#else
+ // this is for debugging - we don't care locking it
+ memory_statistics.memory_calls_made++;
+ memory_statistics.mmapped_memory += size;
+#endif
+}
+
+static inline void calloc_accounting(const char *file, const char *function, const unsigned long line, size_t size) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+ __atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.calloc_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.allocated_memory, size, __ATOMIC_SEQ_CST);
+#else
+ // this is for debugging - we don't care locking it
+ memory_statistics.memory_calls_made++;
+ memory_statistics.calloc_calls_made++;
+ memory_statistics.allocated_memory += size;
+#endif
+ print_allocations(file, function, line);
+}
+
+static inline void realloc_accounting(const char *file, const char *function, const unsigned long line, void *ptr, size_t size) {
+ (void)ptr;
+
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+ __atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.realloc_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.allocated_memory, size, __ATOMIC_SEQ_CST);
+#else
+ // this is for debugging - we don't care locking it
+ memory_statistics.memory_calls_made++;
+ memory_statistics.realloc_calls_made++;
+ memory_statistics.allocated_memory += size;
+#endif
+ print_allocations(file, function, line);
+}
+
+static inline void strdup_accounting(const char *file, const char *function, const unsigned long line, const char *s) {
+ size_t size = strlen(s) + 1;
+
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+ __atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.strdup_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.allocated_memory, size, __ATOMIC_SEQ_CST);
+#else
+ // this is for debugging - we don't care locking it
+ memory_statistics.memory_calls_made++;
+ memory_statistics.strdup_calls_made++;
+ memory_statistics.allocated_memory += size;
+#endif
+ print_allocations(file, function, line);
+}
+
+static inline void free_accounting(const char *file, const char *function, const unsigned long line, void *ptr) {
+ (void)file;
+ (void)function;
+ (void)line;
+
+ if(likely(ptr)) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+ __atomic_fetch_add(&memory_statistics.memory_calls_made, 1, __ATOMIC_SEQ_CST);
+ __atomic_fetch_add(&memory_statistics.free_calls_made, 1, __ATOMIC_SEQ_CST);
+#else
+ // this is for debugging - we don't care locking it
+ memory_statistics.memory_calls_made++;
+ memory_statistics.free_calls_made++;
+#endif
+ }
+}
+#endif
+
+#ifdef NETDATA_LOG_ALLOCATIONS
+char *strdupz_int(const char *file, const char *function, const unsigned long line, const char *s) {
+ strdup_accounting(file, function, line, s);
+#else
+char *strdupz(const char *s) {
+#endif
+
+ char *t = strdup(s);
+ if (unlikely(!t)) fatal("Cannot strdup() string '%s'", s);
+ return t;
+}
+
+#ifdef NETDATA_LOG_ALLOCATIONS
+void *mallocz_int(const char *file, const char *function, const unsigned long line, size_t size) {
+ malloc_accounting(file, function, line, size);
+#else
+void *mallocz(size_t size) {
+#endif
+
+ void *p = malloc(size);
+ if (unlikely(!p)) fatal("Cannot allocate %zu bytes of memory.", size);
+ return p;
+}
+
+#ifdef NETDATA_LOG_ALLOCATIONS
+void *callocz_int(const char *file, const char *function, const unsigned long line, size_t nmemb, size_t size) {
+ calloc_accounting(file, function, line, nmemb * size);
+#else
+void *callocz(size_t nmemb, size_t size) {
+#endif
+
+ void *p = calloc(nmemb, size);
+ if (unlikely(!p)) fatal("Cannot allocate %zu bytes of memory.", nmemb * size);
+ return p;
+}
+
+#ifdef NETDATA_LOG_ALLOCATIONS
+void *reallocz_int(const char *file, const char *function, const unsigned long line, void *ptr, size_t size) {
+ realloc_accounting(file, function, line, ptr, size);
+#else
+void *reallocz(void *ptr, size_t size) {
+#endif
+
+ void *p = realloc(ptr, size);
+ if (unlikely(!p)) fatal("Cannot re-allocate memory to %zu bytes.", size);
+ return p;
+}
+
+#ifdef NETDATA_LOG_ALLOCATIONS
+void freez_int(const char *file, const char *function, const unsigned long line, void *ptr) {
+ free_accounting(file, function, line, ptr);
+#else
+void freez(void *ptr) {
+#endif
+
+ free(ptr);
+}
+
+// ----------------------------------------------------------------------------
+// time functions
+
+inline unsigned long long timeval_usec(struct timeval *tv) {
+ return tv->tv_sec * 1000000ULL + tv->tv_usec;
+}
+
+// time(NULL) in nanoseconds
+inline unsigned long long time_usec(void) {
+ struct timeval now;
+ gettimeofday(&now, NULL);
+ return timeval_usec(&now);
+}
+
+inline unsigned long long usec_dt(struct timeval *now, struct timeval *old) {
+ unsigned long long tv1 = timeval_usec(now);
+ unsigned long long tv2 = timeval_usec(old);
+ return (tv1 > tv2) ? (tv1 - tv2) : (tv2 - tv1);
+}
+
+int sleep_usec(unsigned long long usec) {
+
+#ifndef NETDATA_WITH_USLEEP
+ // we expect microseconds (1.000.000 per second)
+ // but timespec is nanoseconds (1.000.000.000 per second)
+ struct timespec rem, req = {
+ .tv_sec = (time_t) (usec / 1000000),
+ .tv_nsec = (suseconds_t) ((usec % 1000000) * 1000)
+ };
+
+ while (nanosleep(&req, &rem) == -1) {
+ if (likely(errno == EINTR)) {
+ debug(D_SYSTEM, "nanosleep() interrupted (while sleeping for %llu microseconds).", usec);
+ req.tv_sec = rem.tv_sec;
+ req.tv_nsec = rem.tv_nsec;
+ } else {
+ error("Cannot nanosleep() for %llu microseconds.", usec);
+ break;
+ }
+ }
+
+ return 0;
+#else
+ int ret = usleep(usec);
+ if(unlikely(ret == -1 && errno == EINVAL)) {
+ // on certain systems, usec has to be up to 999999
+ if(usec > 999999) {
+ int counter = usec / 999999;
+ while(counter--)
+ usleep(999999);
+
+ usleep(usec % 999999);
+ }
+ else {
+ error("Cannot usleep() for %llu microseconds.", usec);
+ return ret;
+ }
+ }
+
+ if(ret != 0)
+ error("usleep() failed for %llu microseconds.", usec);
+
+ return ret;
+#endif
+}
+
+unsigned char netdata_map_chart_names[256] = {
+ [0] = '\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] = '0', // 0
+ [49] = '1', // 1
+ [50] = '2', // 2
+ [51] = '3', // 3
+ [52] = '4', // 4
+ [53] = '5', // 5
+ [54] = '6', // 6
+ [55] = '7', // 7
+ [56] = '8', // 8
+ [57] = '9', // 9
+ [58] = '_', // :
+ [59] = '_', // ;
+ [60] = '_', // <
+ [61] = '_', // =
+ [62] = '_', // >
+ [63] = '_', // ?
+ [64] = '_', // @
+ [65] = 'a', // A
+ [66] = 'b', // B
+ [67] = 'c', // C
+ [68] = 'd', // D
+ [69] = 'e', // E
+ [70] = 'f', // F
+ [71] = 'g', // G
+ [72] = 'h', // H
+ [73] = 'i', // I
+ [74] = 'j', // J
+ [75] = 'k', // K
+ [76] = 'l', // L
+ [77] = 'm', // M
+ [78] = 'n', // N
+ [79] = 'o', // O
+ [80] = 'p', // P
+ [81] = 'q', // Q
+ [82] = 'r', // R
+ [83] = 's', // S
+ [84] = 't', // T
+ [85] = 'u', // U
+ [86] = 'v', // V
+ [87] = 'w', // W
+ [88] = 'x', // X
+ [89] = 'y', // Y
+ [90] = 'z', // Z
+ [91] = '_', // [
+ [92] = '/', // backslash
+ [93] = '_', // ]
+ [94] = '_', // ^
+ [95] = '_', // _
+ [96] = '_', // `
+ [97] = 'a', // a
+ [98] = 'b', // b
+ [99] = 'c', // c
+ [100] = 'd', // d
+ [101] = 'e', // e
+ [102] = 'f', // f
+ [103] = 'g', // g
+ [104] = 'h', // h
+ [105] = 'i', // i
+ [106] = 'j', // j
+ [107] = 'k', // k
+ [108] = 'l', // l
+ [109] = 'm', // m
+ [110] = 'n', // n
+ [111] = 'o', // o
+ [112] = 'p', // p
+ [113] = 'q', // q
+ [114] = 'r', // r
+ [115] = 's', // s
+ [116] = 't', // t
+ [117] = 'u', // u
+ [118] = 'v', // v
+ [119] = 'w', // w
+ [120] = 'x', // x
+ [121] = 'y', // y
+ [122] = 'z', // z
+ [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] = '_' //
+};
+
+// make sure the supplied string
+// is good for a netdata chart/dimension ID/NAME
+void netdata_fix_chart_name(char *s) {
+ while ((*s = netdata_map_chart_names[(unsigned char) *s])) s++;
+}
+
+unsigned char netdata_map_chart_ids[256] = {
+ [0] = '\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] = '0', // 0
+ [49] = '1', // 1
+ [50] = '2', // 2
+ [51] = '3', // 3
+ [52] = '4', // 4
+ [53] = '5', // 5
+ [54] = '6', // 6
+ [55] = '7', // 7
+ [56] = '8', // 8
+ [57] = '9', // 9
+ [58] = '_', // :
+ [59] = '_', // ;
+ [60] = '_', // <
+ [61] = '_', // =
+ [62] = '_', // >
+ [63] = '_', // ?
+ [64] = '_', // @
+ [65] = 'a', // A
+ [66] = 'b', // B
+ [67] = 'c', // C
+ [68] = 'd', // D
+ [69] = 'e', // E
+ [70] = 'f', // F
+ [71] = 'g', // G
+ [72] = 'h', // H
+ [73] = 'i', // I
+ [74] = 'j', // J
+ [75] = 'k', // K
+ [76] = 'l', // L
+ [77] = 'm', // M
+ [78] = 'n', // N
+ [79] = 'o', // O
+ [80] = 'p', // P
+ [81] = 'q', // Q
+ [82] = 'r', // R
+ [83] = 's', // S
+ [84] = 't', // T
+ [85] = 'u', // U
+ [86] = 'v', // V
+ [87] = 'w', // W
+ [88] = 'x', // X
+ [89] = 'y', // Y
+ [90] = 'z', // Z
+ [91] = '_', // [
+ [92] = '/', // backslash
+ [93] = '_', // ]
+ [94] = '_', // ^
+ [95] = '_', // _
+ [96] = '_', // `
+ [97] = 'a', // a
+ [98] = 'b', // b
+ [99] = 'c', // c
+ [100] = 'd', // d
+ [101] = 'e', // e
+ [102] = 'f', // f
+ [103] = 'g', // g
+ [104] = 'h', // h
+ [105] = 'i', // i
+ [106] = 'j', // j
+ [107] = 'k', // k
+ [108] = 'l', // l
+ [109] = 'm', // m
+ [110] = 'n', // n
+ [111] = 'o', // o
+ [112] = 'p', // p
+ [113] = 'q', // q
+ [114] = 'r', // r
+ [115] = 's', // s
+ [116] = 't', // t
+ [117] = 'u', // u
+ [118] = 'v', // v
+ [119] = 'w', // w
+ [120] = 'x', // x
+ [121] = 'y', // y
+ [122] = 'z', // z
+ [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] = '_' //
+};
+
+// make sure the supplied string
+// is good for a netdata chart/dimension ID/NAME
+void netdata_fix_chart_id(char *s) {
+ while ((*s = netdata_map_chart_ids[(unsigned char) *s])) s++;
+}
+