/* * Simple C functions to supplement the C library * * Copyright (c) 2006 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "qemu-common.h" #include "qemu/host-utils.h" #include <math.h> #include "qemu/sockets.h" #include "qemu/iov.h" void strpadcpy(char *buf, int buf_size, const char *str, char pad) { int len = qemu_strnlen(str, buf_size); memcpy(buf, str, len); memset(buf + len, pad, buf_size - len); } void pstrcpy(char *buf, int buf_size, const char *str) { int c; char *q = buf; if (buf_size <= 0) return; for(;;) { c = *str++; if (c == 0 || q >= buf + buf_size - 1) break; *q++ = c; } *q = '\0'; } /* strcat and truncate. */ char *pstrcat(char *buf, int buf_size, const char *s) { int len; len = strlen(buf); if (len < buf_size) pstrcpy(buf + len, buf_size - len, s); return buf; } int strstart(const char *str, const char *val, const char **ptr) { const char *p, *q; p = str; q = val; while (*q != '\0') { if (*p != *q) return 0; p++; q++; } if (ptr) *ptr = p; return 1; } int stristart(const char *str, const char *val, const char **ptr) { const char *p, *q; p = str; q = val; while (*q != '\0') { if (qemu_toupper(*p) != qemu_toupper(*q)) return 0; p++; q++; } if (ptr) *ptr = p; return 1; } /* XXX: use host strnlen if available ? */ int qemu_strnlen(const char *s, int max_len) { int i; for(i = 0; i < max_len; i++) { if (s[i] == '\0') { break; } } return i; } time_t mktimegm(struct tm *tm) { time_t t; int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday; if (m < 3) { m += 12; y--; } t = 86400ULL * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469); t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec; return t; } int qemu_fls(int i) { return 32 - clz32(i); } /* * Make sure data goes on disk, but if possible do not bother to * write out the inode just for timestamp updates. * * Unfortunately even in 2009 many operating systems do not support * fdatasync and have to fall back to fsync. */ int qemu_fdatasync(int fd) { #ifdef CONFIG_FDATASYNC return fdatasync(fd); #else return fsync(fd); #endif } /* * Checks if a buffer is all zeroes * * Attention! The len must be a multiple of 4 * sizeof(long) due to * restriction of optimizations in this function. */ bool buffer_is_zero(const void *buf, size_t len) { /* * Use long as the biggest available internal data type that fits into the * CPU register and unroll the loop to smooth out the effect of memory * latency. */ size_t i; long d0, d1, d2, d3; const long * const data = buf; assert(len % (4 * sizeof(long)) == 0); len /= sizeof(long); for (i = 0; i < len; i += 4) { d0 = data[i + 0]; d1 = data[i + 1]; d2 = data[i + 2]; d3 = data[i + 3]; if (d0 || d1 || d2 || d3) { return false; } } return true; } #ifndef _WIN32 /* Sets a specific flag */ int fcntl_setfl(int fd, int flag) { int flags; flags = fcntl(fd, F_GETFL); if (flags == -1) return -errno; if (fcntl(fd, F_SETFL, flags | flag) == -1) return -errno; return 0; } #endif static int64_t suffix_mul(char suffix, int64_t unit) { switch (qemu_toupper(suffix)) { case STRTOSZ_DEFSUFFIX_B: return 1; case STRTOSZ_DEFSUFFIX_KB: return unit; case STRTOSZ_DEFSUFFIX_MB: return unit * unit; case STRTOSZ_DEFSUFFIX_GB: return unit * unit * unit; case STRTOSZ_DEFSUFFIX_TB: return unit * unit * unit * unit; } return -1; } /* * Convert string to bytes, allowing either B/b for bytes, K/k for KB, * M/m for MB, G/g for GB or T/t for TB. End pointer will be returned * in *end, if not NULL. Return -ERANGE on overflow, Return -EINVAL on * other error. */ int64_t strtosz_suffix_unit(const char *nptr, char **end, const char default_suffix, int64_t unit) { int64_t retval = -EINVAL; char *endptr; unsigned char c; int mul_required = 0; double val, mul, integral, fraction; errno = 0; val = strtod(nptr, &endptr); if (isnan(val) || endptr == nptr || errno != 0) { goto fail; } fraction = modf(val, &integral); if (fraction != 0) { mul_required = 1; } c = *endptr; mul = suffix_mul(c, unit); if (mul >= 0) { endptr++; } else { mul = suffix_mul(default_suffix, unit); assert(mul >= 0); } if (mul == 1 && mul_required) { goto fail; } if ((val * mul >= INT64_MAX) || val < 0) { retval = -ERANGE; goto fail; } retval = val * mul; fail: if (end) { *end = endptr; } return retval; } int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix) { return strtosz_suffix_unit(nptr, end, default_suffix, 1024); } int64_t strtosz(const char *nptr, char **end) { return strtosz_suffix(nptr, end, STRTOSZ_DEFSUFFIX_MB); } int qemu_parse_fd(const char *param) { int fd; char *endptr = NULL; fd = strtol(param, &endptr, 10); if (*endptr || (fd == 0 && param == endptr)) { return -1; } return fd; } /* round down to the nearest power of 2*/ int64_t pow2floor(int64_t value) { if (!is_power_of_2(value)) { value = 0x8000000000000000ULL >> clz64(value); } return value; } /* * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128) * Input is limited to 14-bit numbers */ int uleb128_encode_small(uint8_t *out, uint32_t n) { g_assert(n <= 0x3fff); if (n < 0x80) { *out++ = n; return 1; } else { *out++ = (n & 0x7f) | 0x80; *out++ = n >> 7; return 2; } } int uleb128_decode_small(const uint8_t *in, uint32_t *n) { if (!(*in & 0x80)) { *n = *in++; return 1; } else { *n = *in++ & 0x7f; /* we exceed 14 bit number */ if (*in & 0x80) { return -1; } *n |= *in++ << 7; return 2; } }