570 lines
16 KiB
C
570 lines
16 KiB
C
/* vsnprintf_r.c */
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/* Copyright Gerhard Rieger */
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/* a reduced but async-signal-safe and thread-safe version of vsnprintf */
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#include "config.h"
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#include <stddef.h> /* ptrdiff_t */
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#include <ctype.h> /* isdigit() */
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#include <stdarg.h>
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#include <stdlib.h>
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#include <errno.h>
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#if HAVE_SYSLOG_H
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#include <syslog.h>
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#endif
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#include <sys/utsname.h>
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#include <time.h> /* time_t, strftime() */
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#include <sys/time.h> /* gettimeofday() */
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "vsnprintf_r.h"
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/* helper functions for vsnprintf_r():
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e.g. convert an unsigned long to decimal string.
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in: field (must be long enough for all digits and \0
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n: length of field in bytes
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ulo: the value
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returns: the pointer to the result string (need not be ==field)
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*/
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/* this function converts an unsigned long number to decimal ASCII
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it terminates result with \0
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*/
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static char *_diag_ulong_to_dec(char *field, size_t n, unsigned long ulo) {
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char *np = field+n; /* point to the end */
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if (n == 0) return NULL;
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*--np = '\0'; /* \0 in last char of string */
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/* this is not optimal - uses much CPU, but simple to implement */
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/* calculate the result from right to left */
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do { if (np==field) return NULL; *--np = '0'+(ulo%10); } while (ulo/=10);
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return np;
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}
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/* this function converts an unsigned long number to decimal ASCII
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and pads it with space or '0' when size and leading0 are set appropriately
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it reduces size to n-1 if it is greater or equal
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it terminates result with \0
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*/
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static char *diag_ulong_to_dec(char *field, size_t n, unsigned long ulo, int leading0, int size) {
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char *np;
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char c;
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int i;
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if (n == 0) return NULL;
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np = _diag_ulong_to_dec(field, n, ulo);
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if (np == NULL) return np;
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if (size) {
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if (size >= n) size = n-1;
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if (leading0) {
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c = '0';
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} else {
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c = ' ';
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}
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i = size - strlen(np);
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while (--i >= 0) {
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*--np = c;
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}
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}
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return np;
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}
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/* this function converts a signed long number to decimal ASCII
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and pads it with space or '0' when size and leading0 are set appropriately
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it reduces size to n-1 if it is greater or equal
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it terminates result with \0
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*/
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/* like diag_ulong_to_dec but signed; fields need also space for '-' */
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static char *diag_long_to_dec(char *field, size_t n, long lo, int leading0, int size) {
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char *np;
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int minus;
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unsigned long ulo;
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int i;
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if ((minus = (lo < 0))) {
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ulo = (~lo)+1;
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} else {
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ulo = lo;
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}
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np = _diag_ulong_to_dec(field, n, ulo);
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if (np == NULL) return np;
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if (size) {
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if (size >= n) size = n-1;
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i = size - strlen(np);
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if (leading0) {
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if (minus) --i;
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while (--i >= 0) {
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*--np = '0';
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}
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if (minus) *--np = '-';
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} else {
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if (minus) { *--np = '-'; --i; }
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while (--i >= 0) {
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*--np = ' ';
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}
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}
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} else {
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if (minus) *--np = '-';
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}
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return np;
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}
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/* this function converts an unsigned long number to hexadecimal ASCII
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it terminates result with \0
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*/
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static char *diag_ulong_to_hex(char *field, size_t n, unsigned long ulo, int leading0, size_t size) {
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char *np = field+n; /* point to the end */
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int i;
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char c;
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if (n == 0) return NULL;
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*--np = '\0'; /* \0 in last char of string */
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/* calculate the result from right to left */
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do { if (np==field) return NULL; i = (ulo&0x0f);
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*--np = (i<10?'0':('a'-10))+i; }
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while (ulo>>=4);
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if (size) {
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if (size >= n) size = n-1;
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if (leading0) {
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c = '0';
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} else {
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c = ' ';
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}
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i = size - strlen(np);
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while (--i >= 0) {
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*--np = c;
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}
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}
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return np;
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}
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/* this function converts an unsigned long number to octal ASCII
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it terminates result with \0
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*/
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static char *diag_ulong_to_oct(char *field, size_t n, unsigned long ulo, int leading0, size_t size) {
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char *np = field+n; /* point to the end */
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int i;
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char c;
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if (n == 0) return NULL;
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*--np = '\0'; /* \0 in last char of string */
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/* calculate the result from right to left */
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do { if (np==field) return NULL; i = (ulo&0x07); *--np = '0'+i; }
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while (ulo>>=3);
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if (size) {
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if (size >= n) size = n-1;
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if (leading0) {
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c = '0';
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} else {
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c = ' ';
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}
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i = size - strlen(np);
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while (--i >= 0) {
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*--np = c;
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}
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}
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return np;
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}
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#if HAVE_TYPE_LONGLONG
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/* this function converts an unsigned long long number to decimal ASCII
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it terminates result with \0
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*/
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static char *_diag_ulonglong_to_dec(char *field, size_t n, unsigned long long ull) {
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char *np = field+n; /* point to the end */
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if (n == 0) return NULL;
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*--np = '\0'; /* \0 in last char of string */
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/* this is not optimal - uses much CPU, but simple to implement */
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/* calculate the result from right to left */
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do { if (np==field) return NULL; *--np = '0'+(ull%10); } while (ull/=10);
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return np;
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}
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/* this function converts an unsigned long long number to decimal ASCII
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and pads it with space or '0' when size and leading0 are set appropriately
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it reduces size to n-1 if it is greater or equal
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it terminates result with \0
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*/
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static char *diag_ulonglong_to_dec(char *field, size_t n, unsigned long long ull, int leading0, int size) {
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char *np;
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char c;
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int i;
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if (n == 0) return NULL;
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np = _diag_ulonglong_to_dec(field, n, ull);
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if (size) {
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if (size >= n) size = n-1;
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if (leading0) {
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c = '0';
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} else {
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c = ' ';
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}
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i = size - strlen(np);
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while (i-- > 0) {
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*--np = c;
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}
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}
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return np;
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}
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/* this function converts a signed long long number to decimal ASCII
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and pads it with space or '0' when size and leading0 are set appropriately
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it reduces size to n-1 if it is greater or equal
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it terminates result with \0
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*/
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/* like diag_ulonglong_to_dec but signed; fields need also space for '-' */
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static char *diag_longlong_to_dec(char *field, size_t n, long long ll, int leading0, int size) {
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char *np;
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int minus;
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unsigned long ull;
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int i;
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if ((minus = (ll < 0))) {
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ull = (~ll)+1;
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} else {
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ull = ll;
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}
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np = _diag_ulonglong_to_dec(field, n, ull);
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if (np == NULL) return np;
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if (size) {
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if (size >= n) size = n-1;
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i = size - strlen(np);
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if (leading0) {
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if (minus) --i;
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while (--i >= 0) {
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*--np = '0';
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}
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if (minus) *--np = '-';
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} else {
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if (minus) { *--np = '-'; --i; }
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while (--i >= 0) {
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*--np = ' ';
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}
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}
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}
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return np;
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}
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/* this function converts an unsigned long long number to hexadecimal ASCII
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it terminates result with \0
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*/
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static char *diag_ulonglong_to_hex(char *field, size_t n, unsigned long long ull, int leading0, size_t size) {
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char *np = field+n; /* point to the end */
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unsigned int i;
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char c;
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if (n == 0) return NULL;
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*--np = '\0'; /* \0 in last char of string */
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/* calculate the result from right to left */
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do { if (np==field) return NULL; i = (ull&0x0f);
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*--np = (i<10?'0':('a'-10))+i; }
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while (ull>>=4);
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if (size) {
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if (size >= n) size = n-1;
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if (leading0) {
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c = '0';
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} else {
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c = ' ';
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}
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i = size - strlen(np);
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while (--i >= 0) {
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*--np = c;
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}
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}
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return np;
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}
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/* this function converts an unsigned long long number to octal ASCII
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it is async signal safe and thread safe
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it returns NULL if n==0
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it returns NULL if field is too short to hold the result
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it returns a pointer to the result string (somewhere within field)
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it terminates result with \0
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*/
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static char *diag_ulonglong_to_oct(char *field, size_t n, unsigned long long ull, int leading0, size_t size) {
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char *np = field+n; /* point to the end */
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int i;
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char c;
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if (n == 0) return NULL;
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*--np = '\0'; /* \0 in last char of string */
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/* calculate the result from right to left */
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do { if (np==field) return NULL; i = (ull&0x07); *--np = '0'+i; }
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while (ull>>=3);
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if (size) {
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if (size >= n) size = n-1;
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if (leading0) {
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c = '0';
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} else {
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c = ' ';
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}
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i = size - strlen(np);
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while (--i >= 0) {
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*--np = c;
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}
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}
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return np;
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}
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#endif /* HAVE_TYPE_LONGLONG */
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/* this function is designed as a variant of vsnprintf(3) but async signal safe
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and thread safe
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it currently only implements a subset of the format directives
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returns <0 if an error occurred (no scenario know yet)
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returns >=size if output is truncated (conforming to C99 standard)
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*/
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int vsnprintf_r(char *str, size_t size, const char *format, va_list ap) {
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size_t i = 0;
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char c;
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int full = 0; /* indicate if output buffer full */
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--size; /* without trailing \0 */
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while (c = *format++) {
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if (c == '\\') {
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} else if (c == '%') {
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#if HAVE_TYPE_LONGLONG
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# define num_buff_len ((sizeof(unsigned long long)*8+2)/3+1) /* hold up to u long long in octal w/ \0 */
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#else
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# define num_buff_len ((sizeof(unsigned long)*8+2)/3+1)]; /* hold up to u long in octal w/ \0 */
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#endif
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char lengthmod = '\0'; /* 'h' 'l' 'L' 'z' */
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int leading0 = 0; /* or 1 */
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size_t fsize = 0; /* size of field */
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const char *st; /* string */
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long lo; unsigned long ulo;
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#if HAVE_TYPE_LONGLONG
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long long ll; unsigned long long ull;
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#endif
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char field[num_buff_len]; /* result of number conversion */
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char *np; /* num pointer */
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c = *format++;
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if (c == '\0') { break; }
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/* flag characters */
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switch (c) {
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case '0': leading0 = 1; c = *format++; break;
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/* not handled: '#' '-' ' ' '+' '\'' */
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}
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if (c == '\0') { break; }
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/* field width */
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switch (c) {
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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do {
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fsize = 10*fsize+(c-'0');
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c = *format++;
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} while (c && isdigit(c));
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break;
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}
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if (c == '\0') { break; }
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/* precision - not handles */
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/* length modifier */
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switch (c) {
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/* not handled: 'q' 'j' 't' */
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/* handled: 'h' 'hh'->'H' 'z' 'Z'->'z' 'l' 'll'->'L' 'L' */
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case 'Z': c = 'z'; /* fall through */
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#if HAVE_TYPE_LONGLONG
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case 'L':
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#endif
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case 'z': lengthmod = c; c = *format++; break;
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case 'h':
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lengthmod = c;
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if ((c = *format++) == 'h') {
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lengthmod = 'H'; c = *format++;
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}
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break;
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case 'l':
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lengthmod = c;
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if ((c = *format++) == 'l') {
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lengthmod = 'L'; c = *format++;
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}
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break;
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}
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if (c == '\0') { break; }
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/* conversion specifier */
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switch (c) {
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case 'c': c = va_arg(ap, int); /* fall through */
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case '%': *str++ = c; if (++i == size) { full = 1; } break;
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case 's': st = va_arg(ap, const char *);
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/* no modifier handled! */
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while (c = *st++) {
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*str++ = c;
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if (++i == size) { full = 1; break; }
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}
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break;
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case 'd':
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#if HAVE_TYPE_LONGLONG
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if (lengthmod == 'L') {
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ll = va_arg(ap, long long);
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np = diag_longlong_to_dec(field, num_buff_len, ll, leading0, fsize);
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while (c = *np++) {
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*str++ = c;
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if (++i == size) { full = 1; break; }
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}
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} else
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#endif
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{
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switch (lengthmod) {
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case 'l': lo = va_arg(ap, long); break;
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case 'z': lo = va_arg(ap, ptrdiff_t); break;
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default: lo = va_arg(ap, int); break;
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}
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np = diag_long_to_dec(field, num_buff_len, lo, leading0, fsize);
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while (c = *np++) { *str++ = c;
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if (++i == size) { full = 1; break; }
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}
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}
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break;
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case 'u':
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#if HAVE_TYPE_LONGLONG
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if (lengthmod == 'L') {
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ull = va_arg(ap, unsigned long long);
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np = diag_ulonglong_to_dec(field, num_buff_len, ull, leading0, fsize);
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while (c = *np++) { *str++ = c;
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if (++i == size) { full = 1; break; }
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}
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} else
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#endif
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{
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switch (lengthmod) {
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case 'l': ulo = va_arg(ap, unsigned long); break;
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case 'z': ulo = va_arg(ap, size_t); break;
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default: ulo = va_arg(ap, unsigned int); break;
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}
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np = diag_ulong_to_dec(field, num_buff_len, ulo, leading0, fsize);
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while (c = *np++) { *str++ = c;
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if (++i == size) { full = 1; break; }
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}
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}
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break;
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case 'p':
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ulo = va_arg(ap, size_t);
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np = diag_ulong_to_hex(field, num_buff_len, ulo, leading0, fsize);
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*str++ = '0'; if (++i == size) { full = 1; break; }
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*str++ = 'x'; if (++i == size) { full = 1; break; }
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while (c = *np++) { *str++ = c;
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if (++i == size) { full = 1; break; }
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}
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break;
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case 'x':
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#if HAVE_TYPE_LONGLONG
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if (lengthmod == 'L') {
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ull = va_arg(ap, unsigned long long);
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np = diag_ulonglong_to_hex(field, num_buff_len, ull, leading0, fsize);
|
|
while (c = *np++) { *str++ = c;
|
|
if (++i == size) { full = 1; break; }
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
switch (lengthmod) {
|
|
case 'l': ulo = va_arg(ap, unsigned long); break;
|
|
case 'z': ulo = va_arg(ap, size_t); break;
|
|
default: ulo = va_arg(ap, unsigned int); break;
|
|
}
|
|
np = diag_ulong_to_hex(field, num_buff_len, ulo, leading0, fsize);
|
|
while (c = *np++) { *str++ = c;
|
|
if (++i == size) { full = 1; break; }
|
|
}
|
|
}
|
|
break;
|
|
case 'o':
|
|
#if HAVE_TYPE_LONGLONG
|
|
if (lengthmod == 'L') {
|
|
ull = va_arg(ap, unsigned long long);
|
|
np = diag_ulonglong_to_oct(field, num_buff_len, ull, leading0, fsize);
|
|
while (c = *np++) { *str++ = c;
|
|
if (++i == size) break;
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
switch (lengthmod) {
|
|
case 'l': ulo = va_arg(ap, unsigned long); break;
|
|
case 'z': ulo = va_arg(ap, size_t); break;
|
|
default: ulo = va_arg(ap, unsigned int); break;
|
|
}
|
|
np = diag_ulong_to_oct(field, num_buff_len, ulo, leading0, fsize);
|
|
while (c = *np++) { *str++ = c;
|
|
if (++i == size) { full = 1; break; }
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
*str++ = c; if (++i == size) { full = 1; break; }
|
|
}
|
|
if (full) break;
|
|
} else {
|
|
*str++ = c;
|
|
if (++i == size) break;
|
|
}
|
|
}
|
|
*str = '\0';
|
|
return i;
|
|
}
|
|
|
|
int snprintf_r(char *str, size_t size, const char *format, ...) {
|
|
int result;
|
|
va_list ap;
|
|
va_start(ap, format);
|
|
result = vsnprintf_r(str, size, format, ap);
|
|
va_end(ap);
|
|
return result;
|
|
}
|
|
|