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.. _hoc_sscanf_doc:
String Parsing (sscanf)
-----------------------
.. hoc:function:: sscanf
Syntax:
``num = sscanf("string", "format", args)``
Description:
A subset of the c stdio sscanf function.
The formats understood are %s, %[...], %c, %lf, %f, %d, %i, %o, %x, along with
numbers and the * character. Explicit strings in the format are also understood.
A great deal of error checking is done to make sure the args match the
format string. The function returns the actual number of args that are
assigned values.
Note that %lf is always preferred to %f since the latter truncates to floating
point accuracy. Hence
.. code-block::
none
x=0
sscanf("0.3","%f",&x)
print x
prints the value
0.30000001
Example:
.. code-block::
none
strdef s
double x[20]
y=0
sscanf("this is a test\n", "%s", s)
print s
sscanf("this is a test\n", "%[^\n]", s)
print s
sscanf("this is a test\n", "%*s%s", s)
print s
sscanf("this is a test\n", "%2s", s)
print s
sscanf("this is a test\n", "%10s", s)
print s
sscanf("this is a test\n", "%*3s%s", s)
print s
sscanf("this is a test\n", "%*s%s", s)
sscanf("0xff 010 25", "%i%i%i", &x[0], &x[1], &x[2])
print x[0], x[1], x[2]
double x[20]
sscanf("ff 10 25", "%x%o%d", &x[0], &x[1], &x[2])
print x[0], x[1], x[2]
sscanf("50.75", "%d.%d", &x[0], &x[1])
print x[0], x[1]
sscanf("30.987654321", "%f", &y)
printf("%20.15g\n", y)
sscanf("30.987654321", "%lf", &y)
printf("%20.15g\n", y)
sscanf("A", "%c", &y)
printf("%c\n", y)
sscanf("1 2 3 4 5 6 7 8 9 10", "%f%f%f%f%f%f%f%f%f%f%f", &x[0], &x[1], &x[2],\
&x[3], &x[4], &x[5], &x[6], &x[7], &x[8], &x[9], &x[10], &x[11], &x[12])
print "should only read ten of the following"
for i=0,12 print i, x[i]
print "error tests"
execute1("sscanf(\"string\", \"%\", s)")
execute1("sscanf(\"string\", \"%*\", s)")
execute1("sscanf(\"string\", \"%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\", &x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x)")
execute1("sscanf(\"string\", \"%*5\", s)")
execute1("sscanf(\"string\", \"%l[st]\", s)")
execute1("sscanf(\"string\", \"%[\", s)")
execute1("sscanf(\"string\", \"%[]\", s)")
execute1("sscanf(\"string\", \"%[^]\", s)")
execute1("sscanf(\"string\", \"%ls\", s)")
execute1("sscanf(\"string\", \"%lc\", &y)")
execute1("sscanf(\"string\", \"%5c\", &y)")
execute1("sscanf(\"string\", \"%q\", &y)")
execute1("sscanf(\"string\", \"%s\")")
execute1("sscanf(\"string\", \"%s\", &y)")
execute1("sscanf(\"25\", \"%d\", s)")
execute1("sscanf(\"string\", \"%c%c%c%c%c%c%c%c%c%c%c%c%c\", &x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x,&x)")
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