Wed, 27 Feb 2013 13:53:28 +0100
added sstrtrim
1 /*
2 * File: sstring.c
3 * Author: olaf
4 *
5 * Created on 17. Juni 2010, 13:27
6 */
8 #include <stdlib.h>
9 #include <string.h>
10 #include <stdarg.h>
12 #include "string.h"
14 sstr_t sstr(char *s) {
15 sstr_t string;
16 string.ptr = s;
17 string.length = strlen(s);
18 return string;
19 }
21 sstr_t sstrn(char *s, size_t n) {
22 sstr_t string;
23 string.ptr = s;
24 string.length = n;
25 return string;
26 }
28 size_t sstrnlen(size_t n, sstr_t s, ...) {
29 va_list ap;
30 size_t size = s.length;
31 va_start(ap, s);
33 for (size_t i = 0 ; i < n-1 ; i++) {
34 sstr_t str = va_arg(ap, sstr_t);
35 size += str.length;
36 }
37 va_end(ap);
39 return size;
40 }
42 sstr_t sstrcat(sstr_t s, ...) {
43 va_list ap;
44 va_start(ap, s);
45 s.ptr[0] = 0;
47 sstr_t str = va_arg (ap, sstr_t);
48 while (str.ptr != NULL) {
49 s.ptr = strncat (s.ptr, str.ptr, s.length);
50 str = va_arg (ap, sstr_t);
51 }
52 va_end(ap);
54 return s;
55 }
57 sstr_t sstrncat(size_t n, sstr_t s, sstr_t c1, ...) {
58 va_list ap;
59 va_start(ap, c1);
60 s.ptr[0] = 0;
62 size_t len = s.length;
63 size_t cplen = c1.length > len ? len : c1.length;
64 char *ptr = s.ptr;
66 memcpy(ptr, c1.ptr, cplen);
67 len -= cplen;
68 ptr += cplen;
69 for (size_t i = 0 ; i < n-1 ; i++) {
70 sstr_t str = va_arg (ap, sstr_t);
71 cplen = str.length > len ? len : str.length;
72 if(cplen <= 0) {
73 va_end(ap);
74 return s;
75 }
76 memcpy(ptr, str.ptr, cplen);
77 len -= cplen;
78 ptr += cplen;
79 }
80 va_end(ap);
82 return s;
83 }
85 sstr_t sstrsubs(sstr_t s, size_t start) {
86 return sstrsubsl (s, start, s.length-start);
87 }
89 sstr_t sstrsubsl(sstr_t s, size_t start, size_t length) {
90 sstr_t new_sstr;
91 if (start < 0 || start >= s.length || length < 0) {
92 return s;
93 }
94 if (length > s.length-start) {
95 length = s.length-start;
96 }
97 new_sstr.ptr = &s.ptr[start];
98 new_sstr.length = length;
99 return new_sstr;
100 }
102 sstr_t* sstrsplit(sstr_t s, sstr_t d, size_t *n) {
103 if (d.length == 0) {
104 return NULL;
105 }
107 sstr_t* result;
108 size_t nmax = *n;
109 *n = 1;
111 /* special case: exact match - no processing needed */
112 if (s.length == d.length && strncmp(s.ptr, d.ptr, s.length) == 0) {
113 *n = 0;
114 return NULL;
115 }
116 sstr_t sv = sstrdup(s);
118 for (size_t i = 0 ; i < s.length ; i++) {
119 if (sv.ptr[i] == d.ptr[0]) {
120 _Bool match = 1;
121 for (size_t j = 1 ; j < d.length ; j++) {
122 if (j+i < s.length) {
123 match &= (sv.ptr[i+j] == d.ptr[j]);
124 } else {
125 match = 0;
126 break;
127 }
128 }
129 if (match) {
130 (*n)++;
131 for (size_t j = 0 ; j < d.length ; j++) {
132 sv.ptr[i+j] = 0;
133 }
134 i += d.length;
135 }
136 }
137 if ((*n) == nmax) break;
138 }
139 result = (sstr_t*) malloc(sizeof(sstr_t) * (*n));
141 char *pptr = sv.ptr;
142 for (size_t i = 0 ; i < *n ; i++) {
143 size_t l = strlen(pptr);
144 char* ptr = (char*) malloc(l + 1);
145 memcpy(ptr, pptr, l);
146 ptr[l] = 0;
148 result[i] = sstrn(ptr, l);
149 pptr += l + d.length;
150 }
152 free(sv.ptr);
154 return result;
155 }
157 int sstrcmp(sstr_t s1, sstr_t s2) {
158 return strncmp(s1.ptr, s2.ptr, s1.length>s2.length ? s2.length: s1.length);
159 }
161 sstr_t sstrdup(sstr_t s) {
162 sstr_t newstring;
163 newstring.ptr = (char*) malloc(s.length + 1);
164 newstring.length = 0;
165 if (newstring.ptr) {
166 newstring.length = s.length;
167 newstring.ptr[newstring.length] = 0;
169 memcpy(newstring.ptr, s.ptr, s.length);
170 } else {
171 newstring.length = 0;
172 }
174 return newstring;
175 }
177 sstr_t sstrtrim(sstr_t string) {
178 sstr_t newstr = string;
179 int i;
180 for(i=0;i<string.length;i++) {
181 char c = string.ptr[i];
182 if(c > 32) {
183 break;
184 }
185 }
186 newstr.ptr = &string.ptr[i];
187 newstr.length = string.length - i;
189 for(i=newstr.length-1;i>=0;i--) {
190 char c = newstr.ptr[i];
191 if(c > 32) {
192 break;
193 }
194 }
195 newstr.length = i + 1;
197 return newstr;
198 }