ceph/src/spdk/dpdk/lib/librte_eal/include/rte_string_fns.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2019 Intel Corporation
   3  */
   4
   5 /**
   6  * @file
   7  *
   8  * String-related functions as replacement for libc equivalents
   9  */
  10
  11 #ifndef _RTE_STRING_FNS_H_
  12 #define _RTE_STRING_FNS_H_
  13
  14 #ifdef __cplusplus
  15 extern "C" {
  16 #endif
  17
  18 #include <stdio.h>
  19 #include <string.h>
  20
  21 #include <rte_common.h>
  22
  23 /**
  24  * Takes string "string" parameter and splits it at character "delim"
  25  * up to maxtokens-1 times - to give "maxtokens" resulting tokens. Like
  26  * strtok or strsep functions, this modifies its input string, by replacing
  27  * instances of "delim" with '\\0'. All resultant tokens are returned in the
  28  * "tokens" array which must have enough entries to hold "maxtokens".
  29  *
  30  * @param string
  31  *   The input string to be split into tokens
  32  *
  33  * @param stringlen
  34  *   The max length of the input buffer
  35  *
  36  * @param tokens
  37  *   The array to hold the pointers to the tokens in the string
  38  *
  39  * @param maxtokens
  40  *   The number of elements in the tokens array. At most, maxtokens-1 splits
  41  *   of the string will be done.
  42  *
  43  * @param delim
  44  *   The character on which the split of the data will be done
  45  *
  46  * @return
  47  *   The number of tokens in the tokens array.
  48  */
  49 int
  50 rte_strsplit(char *string, int stringlen,
  51              char **tokens, int maxtokens, char delim);
  52
  53 /**
  54  * @internal
  55  * DPDK-specific version of strlcpy for systems without
  56  * libc or libbsd copies of the function
  57  */
  58 static inline size_t
  59 rte_strlcpy(char *dst, const char *src, size_t size)
  60 {
  61         return (size_t)snprintf(dst, size, "%s", src);
  62 }
  63
  64 /**
  65  * @internal
  66  * DPDK-specific version of strlcat for systems without
  67  * libc or libbsd copies of the function
  68  */
  69 static inline size_t
  70 rte_strlcat(char *dst, const char *src, size_t size)
  71 {
  72         size_t l = strnlen(dst, size);
  73         if (l < size)
  74                 return l + rte_strlcpy(&dst[l], src, size - l);
  75         return l + strlen(src);
  76 }
  77
  78 /* pull in a strlcpy function */
  79 #ifdef RTE_EXEC_ENV_FREEBSD
  80 #ifndef __BSD_VISIBLE /* non-standard functions are hidden */
  81 #define strlcpy(dst, src, size) rte_strlcpy(dst, src, size)
  82 #define strlcat(dst, src, size) rte_strlcat(dst, src, size)
  83 #endif
  84
  85 #else /* non-BSD platforms */
  86 #ifdef RTE_USE_LIBBSD
  87 #include <bsd/string.h>
  88
  89 #else /* no BSD header files, create own */
  90 #define strlcpy(dst, src, size) rte_strlcpy(dst, src, size)
  91 #define strlcat(dst, src, size) rte_strlcat(dst, src, size)
  92
  93 #endif /* RTE_USE_LIBBSD */
  94 #endif /* FREEBSD */
  95
  96 /**
  97  * Copy string src to buffer dst of size dsize.
  98  * At most dsize-1 chars will be copied.
  99  * Always NUL-terminates, unless (dsize == 0).
 100  * Returns number of bytes copied (terminating NUL-byte excluded) on success ;
 101  * negative errno on error.
 102  *
 103  * @param dst
 104  *   The destination string.
 105  *
 106  * @param src
 107  *   The input string to be copied.
 108  *
 109  * @param dsize
 110  *   Length in bytes of the destination buffer.
 111  *
 112  * @return
 113  *   The number of bytes copied on success
 114  *   -E2BIG if the destination buffer is too small.
 115  */
 116 ssize_t
 117 rte_strscpy(char *dst, const char *src, size_t dsize);
 118
 119 #ifdef __cplusplus
 120 }
 121 #endif
 122
 123 #endif /* RTE_STRING_FNS_H */