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stringbuffer.c
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/*-------------------------------------------------------------------------
*
* stringbuffer.c
* simple stringbuffer
*
* Copyright (c) 2009, Paul Ramsey <[email protected]>
* Copyright (c) 2002 Thamer Alharbash
*
*-------------------------------------------------------------------------
*/
#include "stringbuffer.h"
#pragma GCC diagnostic push
#ifndef __clang__
#pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
#endif
/**
* Allocate a new stringbuffer_t. Use stringbuffer_destroy to free.
*/
stringbuffer_t*
stringbuffer_create(void)
{
return stringbuffer_create_with_size(STRINGBUFFER_STARTSIZE);
}
static void
stringbuffer_init_with_size(stringbuffer_t* s, size_t size)
{
s->str_start = malloc(size);
s->str_end = s->str_start;
s->capacity = size;
memset(s->str_start, 0, size);
}
void
stringbuffer_release(stringbuffer_t* s)
{
if (s->str_start)
{
free(s->str_start);
}
}
void
stringbuffer_init(stringbuffer_t* s)
{
stringbuffer_init_with_size(s, STRINGBUFFER_STARTSIZE);
}
/**
* Allocate a new stringbuffer_t. Use stringbuffer_destroy to free.
*/
stringbuffer_t*
stringbuffer_create_with_size(size_t size)
{
stringbuffer_t* s;
s = malloc(sizeof(stringbuffer_t));
stringbuffer_init_with_size(s, size);
return s;
}
/**
* Free the stringbuffer_t and all memory managed within it.
*/
void
stringbuffer_destroy(stringbuffer_t* s)
{
stringbuffer_release(s);
if (s)
{
free(s);
}
}
/**
* Reset the stringbuffer_t. Useful for starting a fresh string
* without the expense of freeing and re-allocating a new
* stringbuffer_t.
*/
void
stringbuffer_clear(stringbuffer_t* s)
{
s->str_start[0] = '\0';
s->str_end = s->str_start;
}
/**
* If necessary, expand the stringbuffer_t internal buffer to accomodate the
* specified additional size.
*/
static inline void
stringbuffer_makeroom(stringbuffer_t* s, size_t size_to_add)
{
size_t current_size = (s->str_end - s->str_start);
size_t capacity = s->capacity;
size_t required_size = current_size + size_to_add;
while (capacity < required_size)
{
capacity *= 2;
}
if (capacity > s->capacity)
{
s->str_start = realloc(s->str_start, capacity);
s->capacity = capacity;
s->str_end = s->str_start + current_size;
}
}
/**
* Return the last character in the buffer.
*/
char
stringbuffer_lastchar(stringbuffer_t* s)
{
if (s->str_end == s->str_start)
{
return 0;
}
return * (s->str_end - 1);
}
/**
* Append the specified string to the stringbuffer_t.
*/
void
stringbuffer_append(stringbuffer_t* s, const char* a)
{
int alen = strlen(a); /* Length of string to append */
int alen0 = alen + 1; /* Length including null terminator */
stringbuffer_makeroom(s, alen0);
memcpy(s->str_end, a, alen0);
s->str_end += alen;
}
/**
* Append the specified character to the stringbuffer_t.
*/
void
stringbuffer_append_char(stringbuffer_t* s, char c)
{
stringbuffer_makeroom(s, 2); /* space for char + null terminator */
* (s->str_end) = c; /* add char */
s->str_end += 1;
* (s->str_end) = 0; /* null terminate */
}
/**
* Returns a reference to the internal string being managed by
* the stringbuffer. The current string will be null-terminated
* within the internal string.
*/
const char*
stringbuffer_getstring(stringbuffer_t* s)
{
return s->str_start;
}
/**
* Returns a newly allocated string large enough to contain the
* current state of the string. Caller is responsible for
* freeing the return value.
*/
char*
stringbuffer_getstringcopy(stringbuffer_t* s)
{
size_t size = (s->str_end - s->str_start) + 1;
char* str = malloc(size);
memcpy(str, s->str_start, size);
str[size - 1] = '\0';
return str;
}
/**
* Returns the length of the current string, not including the
* null terminator (same behavior as strlen()).
*/
int
stringbuffer_getlength(stringbuffer_t* s)
{
return (s->str_end - s->str_start);
}
/**
* Clear the stringbuffer_t and re-start it with the specified string.
*/
void
stringbuffer_set(stringbuffer_t* s, const char* str)
{
stringbuffer_clear(s);
stringbuffer_append(s, str);
}
/**
* Copy the contents of src into dst.
*/
void
stringbuffer_copy(stringbuffer_t* dst, stringbuffer_t* src)
{
stringbuffer_set(dst, stringbuffer_getstring(src));
}
/**
* Appends a formatted string to the current string buffer,
* using the format and argument list provided. Returns -1 on error,
* check errno for reasons, documented in the printf man page.
*/
static int
stringbuffer_avprintf(stringbuffer_t* s, const char* fmt, va_list ap)
{
int maxlen = (s->capacity - (s->str_end - s->str_start));
int len = 0; /* Length of the output */
va_list ap2;
/* Make a copy of the variadic arguments, in case we need to print twice */
/* Print to our buffer */
va_copy(ap2, ap);
len = vsnprintf(s->str_end, maxlen, fmt, ap2);
va_end(ap2);
/* Propogate errors up */
if (len < 0)
#if defined(__MINGW64_VERSION_MAJOR)
len = _vscprintf(fmt,
ap2); /**Assume windows flaky vsnprintf that returns -1 if initial buffer to small and add more space **/
#else
return len;
#endif
/* We didn't have enough space! */
/* Either Unix vsnprint returned write length larger than our buffer */
/* or Windows vsnprintf returned an error code. */
if (len >= maxlen)
{
stringbuffer_makeroom(s, len + 1);
maxlen = (s->capacity - (s->str_end - s->str_start));
/* Try to print a second time */
len = vsnprintf(s->str_end, maxlen, fmt, ap);
/* Printing error? Error! */
if (len < 0)
{
return len;
}
/* Too long still? Error! */
if (len >= maxlen)
{
return -1;
}
}
/* Move end pointer forward and return. */
s->str_end += len;
return len;
}
/**
* Appends a formatted string to the current string buffer,
* using the format and argument list provided.
* Returns -1 on error, check errno for reasons,
* as documented in the printf man page.
*/
int
stringbuffer_aprintf(stringbuffer_t* s, const char* fmt, ...)
{
int r;
va_list ap;
va_start(ap, fmt);
r = stringbuffer_avprintf(s, fmt, ap);
va_end(ap);
return r;
}
/**
* Trims whitespace off the end of the stringbuffer. Returns
* the number of characters trimmed.
*/
int
stringbuffer_trim_trailing_white(stringbuffer_t* s)
{
char* ptr = s->str_end;
int dist = 0;
/* Roll backwards until we hit a non-space. */
while (ptr > s->str_start)
{
ptr--;
if ((*ptr == ' ') || (*ptr == '\t'))
{
continue;
}
else
{
ptr++;
dist = s->str_end - ptr;
*ptr = '\0';
s->str_end = ptr;
return dist;
}
}
return dist;
}
/**
* Trims zeroes off the end of the last number in the stringbuffer.
* The number has to be the very last thing in the buffer. Only the
* last number will be trimmed. Returns the number of characters
* trimmed.
*
* eg: 1.22000 -> 1.22
* 1.0 -> 1
* 0.0 -> 0
*/
int
stringbuffer_trim_trailing_zeroes(stringbuffer_t* s)
{
char* ptr = s->str_end;
char* decimal_ptr = NULL;
int dist;
if (s->str_end - s->str_start < 2)
{
return 0;
}
/* Roll backwards to find the decimal for this number */
while (ptr > s->str_start)
{
ptr--;
if (*ptr == '.')
{
decimal_ptr = ptr;
break;
}
if ((*ptr >= '0') && (*ptr <= '9'))
{
continue;
}
else
{
break;
}
}
/* No decimal? Nothing to trim! */
if (! decimal_ptr)
{
return 0;
}
ptr = s->str_end;
/* Roll backwards again, with the decimal as stop point, trimming contiguous zeroes */
while (ptr >= decimal_ptr)
{
ptr--;
if (*ptr == '0')
{
continue;
}
else
{
break;
}
}
/* Huh, we get anywhere. Must not have trimmed anything. */
if (ptr == s->str_end)
{
return 0;
}
/* If we stopped at the decimal, we want to null that out.
It we stopped on a numeral, we want to preserve that, so push the
pointer forward one space. */
if (*ptr != '.')
{
ptr++;
}
/* Add null terminator re-set the end of the stringbuffer. */
*ptr = '\0';
dist = s->str_end - ptr;
s->str_end = ptr;
return dist;
}