fg_string.c File Reference

Functions to manipulate strings used by Flowgrind. More...

#include "config.h"
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "fg_string.h"
#include "fg_definitions.h"

Go to the source code of this file.

Functions
int	asprintf_append (char **strp, const char *fmt,...)
size_t	fmtlen (const char *fmt, va_list ap)
	Determine the number of characters that would be generated by a printf with format string fmt and arguments ap. More...
char *	strdup_append (char *s, const char *a)
	Append the duplication of string a to the given string s. More...
static char *	strlendup_append (char *s, size_t slen, const char *a, size_t alen)
	Append the duplication of string a of length alen to the given string s at point slen. More...
char *	strndup_append (char *s, const char *a, size_t n)
	Append at most n characters of the duplication of string a to the given string s. More...
int	vasprintf_append (char **strp, const char *fmt, va_list ap)

Detailed Description

Functions to manipulate strings used by Flowgrind.

Definition in file fg_string.c.

Function Documentation

asprintf_append()

int asprintf_append	(	char **	strp,
		const char *	fmt,
			...
	)

Definition at line 98 of file fg_string.c.

{
        va_list ap;
 
        va_start(ap, fmt);
        size_t length = vasprintf_append(strp, fmt, ap);
        va_end(ap);
 
        return length;
}

fmtlen()

size_t fmtlen	(	char const *	fmt,
		va_list	ap
	)

Determine the number of characters that would be generated by a printf with format string fmt and arguments ap.

Parameters

[in]	fmt	format string
[in]	ap	parameters used to fill fmt

Returns

number of number of characters

Definition at line 61 of file fg_string.c.

{
        va_list ap2;
        char c;
 
        /* If the output of vsnprintf is truncated, its return value is the
         * number of characters which would have been written to the string
         * if enough space had been available */
        va_copy(ap2, ap);
        size_t length = vsnprintf(&c, 1, fmt, ap2);
        va_end(ap2);
 
        return length;
}

strdup_append()

char* strdup_append	(	char *	s,
		const char *	a
	)

Append the duplication of string a to the given string s.

Parameters

[in]	s	destination string to append to
[in]	a	source string to be append

Returns

concatenated strings, NULL on error

Definition at line 76 of file fg_string.c.

{
        if (unlikely(!s))
                return strdup(a);
 
        if (unlikely(!a))
                return s;
 
        return strlendup_append(s, strlen(s), a, strlen(a));
}

strlendup_append()

static char* strlendup_append ( char *  s, size_t  slen, const char *  a, size_t  alen  )

inlinestatic

Append the duplication of string a of length alen to the given string s at point slen.

Parameters

[in]	s	destination string to append to
[in]	slen	length of string s
[in]	a	source string to be append
[in]	alen	length of string a

Definition at line 47 of file fg_string.c.

{
        char *ret = realloc(s, slen + alen + 1);
        if (unlikely(!ret))
                return NULL;
 
        /* append the string and the trailing \0 */
        memcpy(&ret[slen], a, alen);
        ret[slen+alen] = 0;
 
        return ret;
}

strndup_append()

char* strndup_append	(	char *	s,
		const char *	a,
		size_t	n
	)

Append at most n characters of the duplication of string a to the given string s.

Parameters

[in]	s	destination string to append to
[in]	a	source string to be append
[in]	n	number of characters to be append from the string

Returns

concatenated strings, NULL on error

Definition at line 87 of file fg_string.c.

{
        if (unlikely(!s))
                return strdup(a);
 
        if (unlikely(!a))
                return s;
 
        return strlendup_append(s, strlen(s), a, strnlen(a, n));
}

vasprintf_append()

int vasprintf_append	(	char **	strp,
		const char *	fmt,
		va_list	ap
	)

Definition at line 109 of file fg_string.c.

{
        if (unlikely(!(*strp)))
                return vasprintf(strp, fmt, ap);
 
        size_t slen = strlen(*strp);
        size_t alen = fmtlen(fmt, ap);
 
        /* The format resulted in no characters being formatted */
        if (unlikely(alen == 0))
                return -1;
 
        char *new_strp = realloc(*strp, slen + alen + 1);
        if (unlikely(!(*new_strp)))
                return -1;
 
        *strp = new_strp;
 
        va_list ap2;
        va_copy(ap2, ap);
        size_t length = vsnprintf(*strp + slen, alen + 1, fmt, ap2);
        va_end(ap2);
 
        return length;
}