Commit | Line | Data |
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bd47a035 DR |
1 | .TH STRING 3 |
2 | .SH NAME | |
3 | strcat, strncat, strcmp, strncmp, strcpy, strncpy, strlen, index, rindex \- string operations | |
4 | .SH SYNOPSIS | |
5 | .B char *strcat(s1, s2) | |
6 | .br | |
7 | .B char *s1, *s2; | |
8 | .PP | |
9 | .B char *strncat(s1, s2, n) | |
10 | .br | |
11 | .B char *s1, *s2; | |
12 | .PP | |
13 | .B strcmp(s1, s2) | |
14 | .br | |
15 | .B char *s1, *s2; | |
16 | .PP | |
17 | .B strncmp(s1, s2, n) | |
18 | .br | |
19 | .B char *s1, *s2; | |
20 | .PP | |
21 | .B char *strcpy(s1, s2) | |
22 | .br | |
23 | .B char *s1, *s2; | |
24 | .PP | |
25 | .B char *strncpy(s1, s2, n) | |
26 | .br | |
27 | .B char *s1, *s2; | |
28 | .PP | |
29 | .B strlen(s) | |
30 | .br | |
31 | .B char *s; | |
32 | .PP | |
33 | .B char *index(s, c) | |
34 | .br | |
35 | .B char *s, c; | |
36 | .PP | |
37 | .B char *rindex(s, c) | |
38 | .br | |
39 | .B char *s; | |
40 | .SH DESCRIPTION | |
41 | These functions operate on null-terminated strings. | |
42 | They do not check for overflow of any receiving string. | |
43 | .PP | |
44 | .I Strcat | |
45 | appends a copy of string | |
46 | .I s2 | |
47 | to the end of string | |
48 | .IR s1 . | |
49 | .I Strncat | |
50 | copies at most | |
51 | .I n | |
52 | characters. | |
53 | Both return a pointer to the null-terminated result. | |
54 | .PP | |
55 | .I Strcmp | |
56 | compares its arguments and returns an integer | |
57 | greater than, equal to, or less than 0, | |
58 | according as | |
59 | .I s1 | |
60 | is lexicographically greater than, equal to, or | |
61 | less than | |
62 | .IR s2 . | |
63 | .I Strncmp | |
64 | makes the same comparison but looks at at most | |
65 | .I n | |
66 | characters. | |
67 | .PP | |
68 | .I Strcpy | |
69 | copies string | |
70 | .I s2 | |
71 | to | |
72 | .I s1, | |
73 | stopping after the null character has been moved. | |
74 | .I Strncpy | |
75 | copies exactly | |
76 | .I n | |
77 | characters, | |
78 | truncating or null-padding | |
79 | .I s2; | |
80 | the target may not be null-terminated if the length | |
81 | of | |
82 | .I s2 | |
83 | is | |
84 | .I n | |
85 | or more. | |
86 | Both return | |
87 | .IR s1 . | |
88 | .PP | |
89 | .I Strlen | |
90 | returns the number of non-null characters in | |
91 | .IR s . | |
92 | .PP | |
93 | .I Index | |
94 | .RI ( rindex ) | |
95 | returns a pointer to the first (last) | |
96 | occurrence of character | |
97 | .I c | |
98 | in string | |
99 | .I s, | |
100 | or zero if | |
101 | .I c | |
102 | does not occur in the string. | |
103 | .SH BUGS | |
104 | .I Strcmp | |
105 | uses native character comparison, which is signed | |
106 | on PDP11's, unsigned on other machines. |