c - segmentation fault on g_string_truncate ()? -

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when trying following in c :

g_string_printf(qbuf,"insert inbox (number, smsdate, text) values ('%s','%04d-%02d-%02d %02d:%02d:%02d', '%s')",           xmx.remote.number,           xmx.smsc_time.year,           xmx.smsc_time.month,           xmx.smsc_time.day,           xmx.smsc_time.hour,           xmx.smsc_time.minute,           xmx.smsc_time.second,           xmx.user_data[0].u.text);

i see following crash:

program received signal sigsegv, segmentation fault. 0x00984809 in g_string_truncate () /lib/libglib-2.0.so.0 (gdb)

why happen? there initiation before calling g_string_printf() ?

from frame 2:

(gdb) frame 2 #2  0x08049ba8 in fetching_phone (unit=0x807cd80) @ main.c:152 152           g_string_printf(qbuf,"insert inbox (number, smsdate, text) values ('%s','%04d-%02d-%02d %02d:%02d:%02d', '%s')", (gdb) ptype xmx.remote.number type = char [40] (gdb) ptype xmx.smsc_time.year type = int (gdb) ptype xmx.smsc_time.month type = int (gdb) ptype xmx.smsc_time.day type = int (gdb) ptype xmx.smsc_time.hour type = int (gdb) ptype xmx.smsc_time.minute type = int (gdb) ptype xmx.smsc_time.second type = int (gdb) ptype xmx.user_data[0].u.text type = unsigned char [1601] (gdb)

but, still can't find problem is.

did initialize qbuf?

gstring *qbuf = g_string_new("");

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