string.h

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 *
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 * notice, this list of conditions and the following disclaimer.
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#ifndef GRPC_INTERNAL_CORE_SUPPORT_STRING_H
#define GRPC_INTERNAL_CORE_SUPPORT_STRING_H

#include <stddef.h>

#include <grpc/support/port_platform.h>
#include <grpc/support/slice_buffer.h>
#include <grpc/support/slice.h>

#ifdef __cplusplus
extern "C" {
#endif

/* String utility functions */

/* Flags for gpr_dump function. */
#define GPR_DUMP_HEX   0x00000001
#define GPR_DUMP_ASCII 0x00000002

/* Converts array buf, of length len, into a C string  according to the flags.
   Result should be freed with gpr_free() */
char *gpr_dump(const char *buf, size_t len, gpr_uint32 flags);

/* Calls gpr_dump on a slice. */
char *gpr_dump_slice(gpr_slice slice, gpr_uint32 flags);

/* Parses an array of bytes into an integer (base 10). Returns 1 on success,
   0 on failure. */
int gpr_parse_bytes_to_uint32(const char *data, size_t length,
                              gpr_uint32 *result);

/* Minimum buffer size for calling ltoa */
#define GPR_LTOA_MIN_BUFSIZE (3 * sizeof(long))

/* Convert a long to a string in base 10; returns the length of the
   output string (or 0 on failure).
   output must be at least GPR_LTOA_MIN_BUFSIZE bytes long. */
int gpr_ltoa(long value, char *output);

/* Reverse a run of bytes */
void gpr_reverse_bytes(char *str, int len);

/* Join a set of strings, returning the resulting string.
   Total combined length (excluding null terminator) is returned in total_length
   if it is non-null. */
char *gpr_strjoin(const char **strs, size_t nstrs, size_t *total_length);

/* Join a set of strings using a separator, returning the resulting string.
   Total combined length (excluding null terminator) is returned in total_length
   if it is non-null. */
char *gpr_strjoin_sep(const char **strs, size_t nstrs, const char *sep,
                      size_t *total_length);

void gpr_slice_split(gpr_slice str, const char *sep, gpr_slice_buffer *dst);

/* A vector of strings... for building up a final string one piece at a time */
typedef struct {
  char **strs;
  size_t count;
  size_t capacity;
} gpr_strvec;

/* Initialize/destroy */
void gpr_strvec_init(gpr_strvec *strs);
void gpr_strvec_destroy(gpr_strvec *strs);
/* Add a string to a strvec, takes ownership of the string */
void gpr_strvec_add(gpr_strvec *strs, char *add);
/* Return a joined string with all added substrings, optionally setting
   total_length as per gpr_strjoin */
char *gpr_strvec_flatten(gpr_strvec *strs, size_t *total_length);

#ifdef __cplusplus
}
#endif

#endif  /* GRPC_INTERNAL_CORE_SUPPORT_STRING_H */