---
name: "isgraph"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["linux", "freebsd", "macos"]
url: "https://new.carta.tech/isgraph"
---

# isgraph(3)

printing character test (space character exclusive)

## NAME

**isgraph**, **isgraph\_l** – printing character test (space character exclusive)

## LIBRARY

Standard C Library (libc, -lc)

## SYNOPSIS

**#include \<ctype.h\>**

*int*\

**isgraph**(*int c*);

*int*\

**isgraph\_l**(*int c*, *locale\_t loc*);

## DESCRIPTION

The **isgraph**() and **isgraph\_l**() functions test for any printing character except space (‘ ’) and other locale-specific space-like characters. The value of the argument must be representable as an *unsigned char* or the value of EOF.

In the ASCII character set, this includes the following characters (with their numeric values shown in octal):

| | | | | |
| --- | --- | --- | --- | --- |
| 041 \`\`!'' | 042 \`\`"'' | 043 \`\`#'' | 044 \`\`$'' | 045 \`\`%'' |
| 046 \`\`&'' | 047 \`\`''' | 050 \`\`('' | 051 \`\`)'' | 052 \`\`\*'' |
| 053 \`\`+'' | 054 \`\`,'' | 055 \`\`-'' | 056 \`\`.'' | 057 \`\`/'' |
| 060 \`\`0'' | 061 \`\`1'' | 062 \`\`2'' | 063 \`\`3'' | 064 \`\`4'' |
| 065 \`\`5'' | 066 \`\`6'' | 067 \`\`7'' | 070 \`\`8'' | 071 \`\`9'' |
| 072 \`\`:'' | 073 \`\`;'' | 074 \`\`\<'' | 075 \`\`='' | 076 \`\`\>'' |
| 077 \`\`?'' | 100 \`\`@'' | 101 \`\`A'' | 102 \`\`B'' | 103 \`\`C'' |
| 104 \`\`D'' | 105 \`\`E'' | 106 \`\`F'' | 107 \`\`G'' | 110 \`\`H'' |
| 111 \`\`I'' | 112 \`\`J'' | 113 \`\`K'' | 114 \`\`L'' | 115 \`\`M'' |
| 116 \`\`N'' | 117 \`\`O'' | 120 \`\`P'' | 121 \`\`Q'' | 122 \`\`R'' |
| 123 \`\`S'' | 124 \`\`T'' | 125 \`\`U'' | 126 \`\`V'' | 127 \`\`W'' |
| 130 \`\`X'' | 131 \`\`Y'' | 132 \`\`Z'' | 133 \`\`\['' | 134 \`\`\\'' |
| 135 \`\`\]'' | 136 \`\`^'' | 137 \`\`\_'' | 140 \`\`\`'' | 141 \`\`a'' |
| 142 \`\`b'' | 143 \`\`c'' | 144 \`\`d'' | 145 \`\`e'' | 146 \`\`f'' |
| 147 \`\`g'' | 150 \`\`h'' | 151 \`\`i'' | 152 \`\`j'' | 153 \`\`k'' |
| 154 \`\`l'' | 155 \`\`m'' | 156 \`\`n'' | 157 \`\`o'' | 160 \`\`p'' |
| 161 \`\`q'' | 162 \`\`r'' | 163 \`\`s'' | 164 \`\`t'' | 165 \`\`u'' |
| 166 \`\`v'' | 167 \`\`w'' | 170 \`\`x'' | 171 \`\`y'' | 172 \`\`z'' |
| 173 \`\`{'' | 174 \`\`\|'' | 175 \`\`}'' | 176 \`\`~'' |  |

The **isgraph\_l**() function takes an explicit locale argument, whereas the **isgraph**() function uses the current global or per-thread locale.

## RETURN VALUES

The **isgraph**() and **isgraph\_l**() functions return zero if the character tests false and return non-zero if the character tests true.

## COMPATIBILITY

The 4.4BSD extension of accepting arguments outside of the range of the *unsigned char* type in locales with large character sets is considered obsolete and may not be supported in future releases. The **iswgraph**() or **iswgraph\_l**() function should be used instead.

## SEE ALSO

[ctype(3)](/ctype/3.md), [ctype\_l(3)](/ctype_l/3.md), [iswgraph(3)](/iswgraph/3.md), [iswgraph\_l(3)](/iswgraph_l/3.md), [xlocale(3)](/xlocale/3.md), [ascii(7)](/ascii/7.md)

## STANDARDS

The **isgraph**() function conforms to ISO/IEC 9899:1990 (“ISO C90”). The **isgraph\_l**() function conforms to IEEE Std 1003.1-2008 (“POSIX.1”).