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Diffstat (limited to 'libnetdata/inlined.h')
| -rw-r--r-- | libnetdata/inlined.h | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/libnetdata/inlined.h b/libnetdata/inlined.h new file mode 100644 index 000000000..6a5994c12 --- /dev/null +++ b/libnetdata/inlined.h @@ -0,0 +1,298 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#ifndef NETDATA_INLINED_H +#define NETDATA_INLINED_H 1 + +#include "libnetdata.h" + +#ifdef KERNEL_32BIT +typedef uint32_t kernel_uint_t; +#define str2kernel_uint_t(string) str2uint32_t(string) +#define KERNEL_UINT_FORMAT "%u" +#else +typedef uint64_t kernel_uint_t; +#define str2kernel_uint_t(string) str2uint64_t(string) +#define KERNEL_UINT_FORMAT "%" PRIu64 +#endif + +#define str2pid_t(string) str2uint32_t(string) + + +// for faster execution, allow the compiler to inline +// these functions that are called thousands of times per second + +static inline uint32_t simple_hash(const char *name) { + unsigned char *s = (unsigned char *) name; + uint32_t hval = 0x811c9dc5; + while (*s) { + hval *= 16777619; + hval ^= (uint32_t) *s++; + } + return hval; +} + +static inline uint32_t simple_uhash(const char *name) { + unsigned char *s = (unsigned char *) name; + uint32_t hval = 0x811c9dc5, c; + while ((c = *s++)) { + if (unlikely(c >= 'A' && c <= 'Z')) c += 'a' - 'A'; + hval *= 16777619; + hval ^= c; + } + return hval; +} + +static inline int simple_hash_strcmp(const char *name, const char *b, uint32_t *hash) { + unsigned char *s = (unsigned char *) name; + uint32_t hval = 0x811c9dc5; + int ret = 0; + while (*s) { + if(!ret) ret = *s - *b++; + hval *= 16777619; + hval ^= (uint32_t) *s++; + } + *hash = hval; + return ret; +} + +static inline int str2i(const char *s) { + int n = 0; + char c, negative = (*s == '-'); + + for(c = (negative)?*(++s):*s; c >= '0' && c <= '9' ; c = *(++s)) { + n *= 10; + n += c - '0'; + } + + if(unlikely(negative)) + return -n; + + return n; +} + +static inline long str2l(const char *s) { + long n = 0; + char c, negative = (*s == '-'); + + for(c = (negative)?*(++s):*s; c >= '0' && c <= '9' ; c = *(++s)) { + n *= 10; + n += c - '0'; + } + + if(unlikely(negative)) + return -n; + + return n; +} + +static inline uint32_t str2uint32_t(const char *s) { + uint32_t n = 0; + char c; + for(c = *s; c >= '0' && c <= '9' ; c = *(++s)) { + n *= 10; + n += c - '0'; + } + return n; +} + +static inline uint64_t str2uint64_t(const char *s) { + uint64_t n = 0; + char c; + for(c = *s; c >= '0' && c <= '9' ; c = *(++s)) { + n *= 10; + n += c - '0'; + } + return n; +} + +static inline unsigned long str2ul(const char *s) { + unsigned long n = 0; + char c; + for(c = *s; c >= '0' && c <= '9' ; c = *(++s)) { + n *= 10; + n += c - '0'; + } + return n; +} + +static inline unsigned long long str2ull(const char *s) { + unsigned long long n = 0; + char c; + for(c = *s; c >= '0' && c <= '9' ; c = *(++s)) { + n *= 10; + n += c - '0'; + } + return n; +} + +static inline long long str2ll(const char *s, char **endptr) { + int negative = 0; + + if(unlikely(*s == '-')) { + s++; + negative = 1; + } + else if(unlikely(*s == '+')) + s++; + + long long n = 0; + char c; + for(c = *s; c >= '0' && c <= '9' ; c = *(++s)) { + n *= 10; + n += c - '0'; + } + + if(unlikely(endptr)) + *endptr = (char *)s; + + if(unlikely(negative)) + return -n; + else + return n; +} + +static inline long double str2ld(const char *s, char **endptr) { + int negative = 0; + const char *start = s; + unsigned long long integer_part = 0; + unsigned long decimal_part = 0; + size_t decimal_digits = 0; + + switch(*s) { + case '-': + s++; + negative = 1; + break; + + case '+': + s++; + break; + + case 'n': + if(s[1] == 'a' && s[2] == 'n') { + if(endptr) *endptr = (char *)&s[3]; + return NAN; + } + break; + + case 'i': + if(s[1] == 'n' && s[2] == 'f') { + if(endptr) *endptr = (char *)&s[3]; + return INFINITY; + } + break; + + default: + break; + } + + while (*s >= '0' && *s <= '9') { + integer_part = (integer_part * 10) + (*s - '0'); + s++; + } + + if(unlikely(*s == '.')) { + decimal_part = 0; + s++; + + while (*s >= '0' && *s <= '9') { + decimal_part = (decimal_part * 10) + (*s - '0'); + s++; + decimal_digits++; + } + } + + if(unlikely(*s == 'e' || *s == 'E')) + return strtold(start, endptr); + + if(unlikely(endptr)) + *endptr = (char *)s; + + if(unlikely(negative)) { + if(unlikely(decimal_digits)) + return -((long double)integer_part + (long double)decimal_part / powl(10.0, decimal_digits)); + else + return -((long double)integer_part); + } + else { + if(unlikely(decimal_digits)) + return (long double)integer_part + (long double)decimal_part / powl(10.0, decimal_digits); + else + return (long double)integer_part; + } +} + +#ifdef NETDATA_STRCMP_OVERRIDE +#ifdef strcmp +#undef strcmp +#endif +#define strcmp(a, b) strsame(a, b) +#endif // NETDATA_STRCMP_OVERRIDE + +static inline int strsame(const char *a, const char *b) { + if(unlikely(a == b)) return 0; + while(*a && *a == *b) { a++; b++; } + return *a - *b; +} + +static inline char *strncpyz(char *dst, const char *src, size_t n) { + char *p = dst; + + while (*src && n--) + *dst++ = *src++; + + *dst = '\0'; + + return p; +} + +static inline int read_file(const char *filename, char *buffer, size_t size) { + if(unlikely(!size)) return 3; + + int fd = open(filename, O_RDONLY, 0666); + if(unlikely(fd == -1)) { + buffer[0] = '\0'; + return 1; + } + + ssize_t r = read(fd, buffer, size); + if(unlikely(r == -1)) { + buffer[0] = '\0'; + close(fd); + return 2; + } + buffer[r] = '\0'; + + close(fd); + return 0; +} + +static inline int read_single_number_file(const char *filename, unsigned long long *result) { + char buffer[30 + 1]; + + int ret = read_file(filename, buffer, 30); + if(unlikely(ret)) { + *result = 0; + return ret; + } + + buffer[30] = '\0'; + *result = str2ull(buffer); + return 0; +} + +static inline int read_single_signed_number_file(const char *filename, long long *result) { + char buffer[30 + 1]; + + int ret = read_file(filename, buffer, 30); + if(unlikely(ret)) { + *result = 0; + return ret; + } + + buffer[30] = '\0'; + *result = atoll(buffer); + return 0; +} + +#endif //NETDATA_INLINED_H |