#include "exim.h"
+#include <assert.h>
#ifndef COMPILE_UTILITY
int
string_is_ip_address(const uschar *s, int *maskptr)
{
-int i;
int yield = 4;
/* If an optional mask is permitted, check for it. If found, pass back the
{
BOOL had_double_colon = FALSE;
BOOL v4end = FALSE;
- int count = 0;
yield = 6;
may be one and only one appearance of double colon, which implies any number
of binary zero bits. The number of preceding components is held in count. */
- for (count = 0; count < 8; count++)
+ for (int count = 0; count < 8; count++)
{
/* If the end of the string is reached before reading 8 components, the
address is valid provided a double colon has been read. This also applies
/* Test for IPv4 address, which may be the tail-end of an IPv6 address. */
-for (i = 0; i < 4; i++)
+for (int i = 0; i < 4; i++)
{
long n;
uschar * end;
/* First find the end of the string */
if (*s != '\"')
- {
while (*s != 0 && !isspace(*s)) s++;
- }
else
{
s++;
- while (*s != 0 && *s != '\"')
+ while (*s && *s != '\"')
{
if (*s == '\\') (void)string_interpret_escape(&s);
s++;
}
- if (*s != 0) s++;
+ if (*s) s++;
}
/* Get enough store to copy into */
* Format a string and save it *
*************************************************/
-/* The formatting is done by string_format, which checks the length of
+/* The formatting is done by string_vformat, which checks the length of
everything.
Arguments:
uschar *
string_sprintf(const char *format, ...)
{
-va_list ap;
+#ifdef COMPILE_UTILITY
uschar buffer[STRING_SPRINTF_BUFFER_SIZE];
+gstring g = { .size = STRING_SPRINTF_BUFFER_SIZE, .ptr = 0, .s = buffer };
+gstring * gp = &g;
+#else
+gstring * gp = string_get(STRING_SPRINTF_BUFFER_SIZE);
+#endif
+gstring * gp2;
+va_list ap;
+
va_start(ap, format);
-if (!string_vformat(buffer, sizeof(buffer), format, ap))
- log_write(0, LOG_MAIN|LOG_PANIC_DIE,
- "string_sprintf expansion was longer than " SIZE_T_FMT
- "; format string was (%s)\nexpansion started '%.32s'",
- sizeof(buffer), format, buffer);
+gp2 = string_vformat(gp, FALSE, format, ap);
+gp->s[gp->ptr] = '\0';
va_end(ap);
-return string_copy(buffer);
+
+if (!gp2)
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+ "string_sprintf expansion was longer than %d; format string was (%s)\n"
+ "expansion started '%.32s'",
+ gp->size, format, gp->s);
+
+#ifdef COMPILE_UTILITY
+return string_copy(gp->s);
+#else
+gstring_reset_unused(gp);
+return gp->s;
+#endif
}
+#ifdef COMPILE_UTILITY
+/* Dummy version for this function; it should never be called */
+static void
+gstring_grow(gstring * g, int p, int count)
+{
+assert(FALSE);
+}
+#endif
+
+
+
#ifndef COMPILE_UTILITY
/*************************************************
* Get next string from separated list *
const uschar *s = *listptr;
BOOL sep_is_special;
-if (s == NULL) return NULL;
+if (!s) return NULL;
/* This allows for a fixed specified separator to be an iscntrl() character,
but at the time of implementation, this is never the case. However, it's best
if (*s == '<' && (ispunct(s[1]) || iscntrl(s[1])))
{
sep = s[1];
- s += 2;
+ if (*++s) ++s;
while (isspace(*s) && *s != sep) s++;
}
else
- {
- sep = (sep == 0)? ':' : -sep;
- }
+ sep = sep ? -sep : ':';
*separator = sep;
}
/* An empty string has no list elements */
-if (*s == 0) return NULL;
+if (!*s) return NULL;
/* Note whether whether or not the separator is an iscntrl() character. */
if (buffer)
{
int p = 0;
- for (; *s != 0; s++)
+ for (; *s; s++)
{
if (*s == sep && (*(++s) != sep || sep_is_special)) break;
if (p < buflen - 1) buffer[p++] = *s;
}
while (p > 0 && isspace(buffer[p-1])) p--;
- buffer[p] = 0;
+ buffer[p] = '\0';
}
/* Handle the case when a buffer is not provided. */
else
{
- const uschar *ss;
gstring * g = NULL;
/* We know that *s != 0 at this point. However, it might be pointing to a
for (;;)
{
- for (ss = s + 1; *ss != 0 && *ss != sep; ss++) ;
+ const uschar * ss;
+ for (ss = s + 1; *ss && *ss != sep; ) ss++;
g = string_catn(g, s, ss-s);
s = ss;
- if (*s == 0 || *(++s) != sep || sep_is_special) break;
+ if (!*s || *++s != sep || sep_is_special) break;
}
while (g->ptr > 0 && isspace(g->s[g->ptr-1])) g->ptr--;
buffer = string_from_gstring(g);
string_append2_listele_n(gstring * list, const uschar * sepstr,
const uschar * ele, unsigned len)
{
-const uschar * sp;
-
if (list && list->ptr)
list = string_cat(list, sepstr);
store_reset(g->s + (g->size = g->ptr + 1));
}
-/*************************************************
-* Add chars to string *
-*************************************************/
-/* Arguments:
- g the grawable-string
+/* Add more space to a growable-string.
+
+Arguments:
+ g the growable-string
p current end of data
count amount to grow by
*/
+/*************************************************
+* Add chars to string *
+*************************************************/
/* This function is used when building up strings of unknown length. Room is
always left for a terminating zero to be added to the string that is being
built. This function does not require the string that is being added to be NUL
*/
BOOL
-string_format(uschar *buffer, int buflen, const char *format, ...)
+string_format(uschar * buffer, int buflen, const char * format, ...)
{
-BOOL yield;
+gstring g = { .size = buflen, .ptr = 0, .s = buffer }, *gp;
va_list ap;
va_start(ap, format);
-yield = string_vformat(buffer, buflen, format, ap);
+gp = string_vformat(&g, FALSE, format, ap);
va_end(ap);
-return yield;
+g.s[g.ptr] = '\0';
+return !!gp;
}
-BOOL
-string_vformat(uschar *buffer, int buflen, const char *format, va_list ap)
+
+
+
+/* Bulid or append to a growing-string, sprintf-style.
+
+If the "extend" argument is true, the string passed in can be NULL,
+empty, or non-empty.
+
+If the "extend" argument is false, the string passed in may not be NULL,
+will not be grown, and is usable in the original place after return.
+The return value can be NULL to signify overflow.
+
+Returns the possibly-new (if copy for growth was needed) string,
+not nul-terminated.
+*/
+
+gstring *
+string_vformat(gstring * g, BOOL extend, const char *format, va_list ap)
{
-/* We assume numbered ascending order, C does not guarantee that */
-enum { L_NORMAL=1, L_SHORT=2, L_LONG=3, L_LONGLONG=4, L_LONGDOUBLE=5, L_SIZE=6 };
+enum ltypes { L_NORMAL=1, L_SHORT=2, L_LONG=3, L_LONGLONG=4, L_LONGDOUBLE=5, L_SIZE=6 };
+
+int width, precision, off, lim;
+const char * fp = format; /* Deliberately not unsigned */
+
+string_datestamp_offset = -1; /* Datestamp not inserted */
+string_datestamp_length = 0; /* Datestamp not inserted */
+string_datestamp_type = 0; /* Datestamp not inserted */
-BOOL yield = TRUE;
-int width, precision;
-const char *fp = format; /* Deliberately not unsigned */
-uschar *p = buffer;
-uschar *last = buffer + buflen - 1;
+#ifdef COMPILE_UTILITY
+assert(!extend);
+assert(g);
+#else
+
+/* Ensure we have a string, to save on checking later */
+if (!g) g = string_get(16);
+#endif /*!COMPILE_UTILITY*/
-string_datestamp_offset = -1; /* Datestamp not inserted */
-string_datestamp_length = 0; /* Datestamp not inserted */
-string_datestamp_type = 0; /* Datestamp not inserted */
+lim = g->size - 1; /* leave one for a nul */
+off = g->ptr; /* remember initial offset in gstring */
/* Scan the format and handle the insertions */
-while (*fp != 0)
+while (*fp)
{
int length = L_NORMAL;
int *nptr;
int slen;
- const char *null = "NULL"; /* ) These variables */
- const char *item_start, *s; /* ) are deliberately */
- char newformat[16]; /* ) not unsigned */
+ const char *null = "NULL"; /* ) These variables */
+ const char *item_start, *s; /* ) are deliberately */
+ char newformat[16]; /* ) not unsigned */
+ char * gp = CS g->s + g->ptr; /* ) */
/* Non-% characters just get copied verbatim */
if (*fp != '%')
{
- if (p >= last) { yield = FALSE; break; }
- *p++ = (uschar)*fp++;
+ /* Avoid string_copyn() due to COMPILE_UTILITY */
+ if (g->ptr >= lim - 1)
+ {
+ if (!extend) return NULL;
+ gstring_grow(g, g->ptr, 1);
+ lim = g->size - 1;
+ }
+ g->s[g->ptr++] = (uschar) *fp++;
continue;
}
}
if (*fp == '.')
- {
if (*(++fp) == '*')
{
precision = va_arg(ap, int);
fp++;
}
else
- {
- precision = 0;
- while (isdigit((uschar)*fp))
- precision = precision*10 + *fp++ - '0';
- }
- }
+ for (precision = 0; isdigit((uschar)*fp); fp++)
+ precision = precision*10 + *fp - '0';
/* Skip over 'h', 'L', 'l', 'll' and 'z', remembering the item length */
else if (*fp == 'L')
{ fp++; length = L_LONGDOUBLE; }
else if (*fp == 'l')
- {
if (fp[1] == 'l')
- {
- fp += 2;
- length = L_LONGLONG;
- }
+ { fp += 2; length = L_LONGLONG; }
else
- {
- fp++;
- length = L_LONG;
- }
- }
+ { fp++; length = L_LONG; }
else if (*fp == 'z')
{ fp++; length = L_SIZE; }
switch (*fp++)
{
case 'n':
- nptr = va_arg(ap, int *);
- *nptr = p - buffer;
- break;
+ nptr = va_arg(ap, int *);
+ *nptr = g->ptr - off;
+ break;
case 'd':
case 'o':
case 'u':
case 'x':
case 'X':
- if (p >= last - ((length > L_LONG)? 24 : 12))
- { yield = FALSE; goto END_FORMAT; }
- strncpy(newformat, item_start, fp - item_start);
- newformat[fp - item_start] = 0;
+ width = length > L_LONG ? 24 : 12;
+ if (g->ptr >= lim - width)
+ {
+ if (!extend) return NULL;
+ gstring_grow(g, g->ptr, width);
+ lim = g->size - 1;
+ gp = CS g->s + g->ptr;
+ }
+ strncpy(newformat, item_start, fp - item_start);
+ newformat[fp - item_start] = 0;
- /* Short int is promoted to int when passing through ..., so we must use
- int for va_arg(). */
+ /* Short int is promoted to int when passing through ..., so we must use
+ int for va_arg(). */
- switch(length)
- {
- case L_SHORT:
- case L_NORMAL: p += sprintf(CS p, newformat, va_arg(ap, int)); break;
- case L_LONG: p += sprintf(CS p, newformat, va_arg(ap, long int)); break;
- case L_LONGLONG: p += sprintf(CS p, newformat, va_arg(ap, LONGLONG_T)); break;
- case L_SIZE: p += sprintf(CS p, newformat, va_arg(ap, size_t)); break;
- }
- break;
+ switch(length)
+ {
+ case L_SHORT:
+ case L_NORMAL:
+ g->ptr += sprintf(gp, newformat, va_arg(ap, int)); break;
+ case L_LONG:
+ g->ptr += sprintf(gp, newformat, va_arg(ap, long int)); break;
+ case L_LONGLONG:
+ g->ptr += sprintf(gp, newformat, va_arg(ap, LONGLONG_T)); break;
+ case L_SIZE:
+ g->ptr += sprintf(gp, newformat, va_arg(ap, size_t)); break;
+ }
+ break;
case 'p':
{
void * ptr;
- if (p >= last - 24) { yield = FALSE; goto END_FORMAT; }
+ if (g->ptr >= lim - 24)
+ {
+ if (!extend) return NULL;
+ gstring_grow(g, g->ptr, 24);
+ lim = g->size - 1;
+ gp = CS g->s + g->ptr;
+ }
/* sprintf() saying "(nil)" for a null pointer seems unreliable.
Handle it explicitly. */
if ((ptr = va_arg(ap, void *)))
{
strncpy(newformat, item_start, fp - item_start);
newformat[fp - item_start] = 0;
- p += sprintf(CS p, newformat, ptr);
+ g->ptr += sprintf(gp, newformat, ptr);
}
else
- p += sprintf(CS p, "(nil)");
+ g->ptr += sprintf(gp, "(nil)");
}
break;
case 'E':
case 'g':
case 'G':
- if (precision < 0) precision = 6;
- if (p >= last - precision - 8) { yield = FALSE; goto END_FORMAT; }
- strncpy(newformat, item_start, fp - item_start);
- newformat[fp-item_start] = 0;
- if (length == L_LONGDOUBLE)
- p += sprintf(CS p, newformat, va_arg(ap, long double));
- else
- p += sprintf(CS p, newformat, va_arg(ap, double));
- break;
+ if (precision < 0) precision = 6;
+ if (g->ptr >= lim - precision - 8)
+ {
+ if (!extend) return NULL;
+ gstring_grow(g, g->ptr, precision+8);
+ lim = g->size - 1;
+ gp = CS g->s + g->ptr;
+ }
+ strncpy(newformat, item_start, fp - item_start);
+ newformat[fp-item_start] = 0;
+ if (length == L_LONGDOUBLE)
+ g->ptr += sprintf(gp, newformat, va_arg(ap, long double));
+ else
+ g->ptr += sprintf(gp, newformat, va_arg(ap, double));
+ break;
/* String types */
case '%':
- if (p >= last) { yield = FALSE; goto END_FORMAT; }
- *p++ = '%';
- break;
+ if (g->ptr >= lim - 1)
+ {
+ if (!extend) return NULL;
+ gstring_grow(g, g->ptr, 1);
+ lim = g->size - 1;
+ }
+ g->s[g->ptr++] = (uschar) '%';
+ break;
case 'c':
- if (p >= last) { yield = FALSE; goto END_FORMAT; }
- *p++ = va_arg(ap, int);
- break;
+ if (g->ptr >= lim - 1)
+ {
+ if (!extend) return NULL;
+ gstring_grow(g, g->ptr, 1);
+ lim = g->size - 1;
+ }
+ g->s[g->ptr++] = (uschar) va_arg(ap, int);
+ break;
case 'D': /* Insert daily datestamp for log file names */
- s = CS tod_stamp(tod_log_datestamp_daily);
- string_datestamp_offset = p - buffer; /* Passed back via global */
- string_datestamp_length = Ustrlen(s); /* Passed back via global */
- string_datestamp_type = tod_log_datestamp_daily;
- slen = string_datestamp_length;
- goto INSERT_STRING;
+ s = CS tod_stamp(tod_log_datestamp_daily);
+ string_datestamp_offset = g->ptr; /* Passed back via global */
+ string_datestamp_length = Ustrlen(s); /* Passed back via global */
+ string_datestamp_type = tod_log_datestamp_daily;
+ slen = string_datestamp_length;
+ goto INSERT_STRING;
case 'M': /* Insert monthly datestamp for log file names */
- s = CS tod_stamp(tod_log_datestamp_monthly);
- string_datestamp_offset = p - buffer; /* Passed back via global */
- string_datestamp_length = Ustrlen(s); /* Passed back via global */
- string_datestamp_type = tod_log_datestamp_monthly;
- slen = string_datestamp_length;
- goto INSERT_STRING;
+ s = CS tod_stamp(tod_log_datestamp_monthly);
+ string_datestamp_offset = g->ptr; /* Passed back via global */
+ string_datestamp_length = Ustrlen(s); /* Passed back via global */
+ string_datestamp_type = tod_log_datestamp_monthly;
+ slen = string_datestamp_length;
+ goto INSERT_STRING;
case 's':
case 'S': /* Forces *lower* case */
case 'T': /* Forces *upper* case */
- s = va_arg(ap, char *);
+ s = va_arg(ap, char *);
- if (s == NULL) s = null;
- slen = Ustrlen(s);
+ if (!s) s = null;
+ slen = Ustrlen(s);
INSERT_STRING: /* Come to from %D or %M above */
- /* If the width is specified, check that there is a precision
- set; if not, set it to the width to prevent overruns of long
- strings. */
-
- if (width >= 0)
{
- if (precision < 0) precision = width;
- }
+ BOOL truncated = FALSE;
- /* If a width is not specified and the precision is specified, set
- the width to the precision, or the string length if shorted. */
+ /* If the width is specified, check that there is a precision
+ set; if not, set it to the width to prevent overruns of long
+ strings. */
- else if (precision >= 0)
- {
- width = (precision < slen)? precision : slen;
- }
+ if (width >= 0)
+ {
+ if (precision < 0) precision = width;
+ }
- /* If neither are specified, set them both to the string length. */
+ /* If a width is not specified and the precision is specified, set
+ the width to the precision, or the string length if shorted. */
- else width = precision = slen;
+ else if (precision >= 0)
+ width = precision < slen ? precision : slen;
- /* Check string space, and add the string to the buffer if ok. If
- not OK, add part of the string (debugging uses this to show as
- much as possible). */
+ /* If neither are specified, set them both to the string length. */
- if (p == last)
- {
- yield = FALSE;
- goto END_FORMAT;
- }
- if (p >= last - width)
- {
- yield = FALSE;
- width = precision = last - p - 1;
- if (width < 0) width = 0;
- if (precision < 0) precision = 0;
+ else
+ width = precision = slen;
+
+ if (!extend)
+ {
+ if (g->ptr == lim) return NULL;
+ if (g->ptr >= lim - width)
+ {
+ truncated = TRUE;
+ width = precision = lim - g->ptr - 1;
+ if (width < 0) width = 0;
+ if (precision < 0) precision = 0;
+ }
+ }
+ else if (g->ptr >= lim - width)
+ {
+ gstring_grow(g, g->ptr, width - (lim - g->ptr));
+ lim = g->size - 1;
+ gp = CS g->s + g->ptr;
+ }
+
+ g->ptr += sprintf(gp, "%*.*s", width, precision, s);
+ if (fp[-1] == 'S')
+ while (*gp) { *gp = tolower(*gp); gp++; }
+ else if (fp[-1] == 'T')
+ while (*gp) { *gp = toupper(*gp); gp++; }
+
+ if (truncated) return NULL;
+ break;
}
- sprintf(CS p, "%*.*s", width, precision, s);
- if (fp[-1] == 'S')
- while (*p) { *p = tolower(*p); p++; }
- else if (fp[-1] == 'T')
- while (*p) { *p = toupper(*p); p++; }
- else
- while (*p) p++;
- if (!yield) goto END_FORMAT;
- break;
/* Some things are never used in Exim; also catches junk. */
default:
- strncpy(newformat, item_start, fp - item_start);
- newformat[fp-item_start] = 0;
- log_write(0, LOG_MAIN|LOG_PANIC_DIE, "string_format: unsupported type "
- "in \"%s\" in \"%s\"", newformat, format);
- break;
+ strncpy(newformat, item_start, fp - item_start);
+ newformat[fp-item_start] = 0;
+ log_write(0, LOG_MAIN|LOG_PANIC_DIE, "string_format: unsupported type "
+ "in \"%s\" in \"%s\"", newformat, format);
+ break;
}
}
-/* Ensure string is complete; return TRUE if got to the end of the format */
+return g;
+}
+
-END_FORMAT:
-*p = 0;
-return yield;
+#ifndef COMPILE_UTILITY
+
+gstring *
+string_fmt_append(gstring * g, const char *format, ...)
+{
+va_list ap;
+va_start(ap, format);
+g = string_vformat(g, TRUE, format, ap);
+va_end(ap);
+return g;
}
-#ifndef COMPILE_UTILITY
/*************************************************
* Generate an "open failed" message *
*************************************************/
string_open_failed(int eno, const char *format, ...)
{
va_list ap;
-uschar buffer[1024];
+gstring * g = string_get(1024);
-Ustrcpy(buffer, "failed to open ");
-va_start(ap, format);
+g = string_catn(g, US"failed to open ", 15);
/* Use the checked formatting routine to ensure that the buffer
does not overflow. It should not, since this is called only for internally
specified messages. If it does, the message just gets truncated, and there
doesn't seem much we can do about that. */
-(void)string_vformat(buffer+15, sizeof(buffer) - 15, format, ap);
+va_start(ap, format);
+(void) string_vformat(g, FALSE, format, ap);
+string_from_gstring(g);
+gstring_reset_unused(g);
va_end(ap);
-return (eno == EACCES)?
- string_sprintf("%s: %s (euid=%ld egid=%ld)", buffer, strerror(eno),
- (long int)geteuid(), (long int)getegid()) :
- string_sprintf("%s: %s", buffer, strerror(eno));
+return eno == EACCES
+ ? string_sprintf("%s: %s (euid=%ld egid=%ld)", g->s, strerror(eno),
+ (long int)geteuid(), (long int)getegid())
+ : string_sprintf("%s: %s", g->s, strerror(eno));
}
#endif /* COMPILE_UTILITY */
+
/*************************************************
**************************************************
* Stand-alone test program *
git://git.exim.org / exim.git / blobdiff