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Functions
inet_aton.c File Reference
#include "c.h"
#include <netinet/in.h>
#include <ctype.h>
#include "port/pg_bswap.h"
Include dependency graph for inet_aton.c:

Go to the source code of this file.

Functions

int inet_aton (const char *cp, struct in_addr *addr)
 

Function Documentation

◆ inet_aton()

int inet_aton ( const char *  cp,
struct in_addr *  addr 
)

Definition at line 56 of file inet_aton.c.

57{
58 unsigned int val;
59 int base,
60 n;
61 char c;
62 u_int parts[4];
63 u_int *pp = parts;
64
65 for (;;)
66 {
67 /*
68 * Collect number up to ``.''. Values are specified as for C: 0x=hex,
69 * 0=octal, other=decimal.
70 */
71 val = 0;
72 base = 10;
73 if (*cp == '0')
74 {
75 if (*++cp == 'x' || *cp == 'X')
76 base = 16, cp++;
77 else
78 base = 8;
79 }
80 while ((c = *cp) != '\0')
81 {
82 if (isdigit((unsigned char) c))
83 {
84 val = (val * base) + (c - '0');
85 cp++;
86 continue;
87 }
88 if (base == 16 && isxdigit((unsigned char) c))
89 {
90 val = (val << 4) +
91 (c + 10 - (islower((unsigned char) c) ? 'a' : 'A'));
92 cp++;
93 continue;
94 }
95 break;
96 }
97 if (*cp == '.')
98 {
99 /*
100 * Internet format: a.b.c.d a.b.c (with c treated as 16-bits)
101 * a.b (with b treated as 24 bits)
102 */
103 if (pp >= parts + 3 || val > 0xff)
104 return 0;
105 *pp++ = val, cp++;
106 }
107 else
108 break;
109 }
110
111 /*
112 * Check for trailing junk.
113 */
114 while (*cp)
115 if (!isspace((unsigned char) *cp++))
116 return 0;
117
118 /*
119 * Concoct the address according to the number of parts specified.
120 */
121 n = pp - parts + 1;
122 switch (n)
123 {
124
125 case 1: /* a -- 32 bits */
126 break;
127
128 case 2: /* a.b -- 8.24 bits */
129 if (val > 0xffffff)
130 return 0;
131 val |= parts[0] << 24;
132 break;
133
134 case 3: /* a.b.c -- 8.8.16 bits */
135 if (val > 0xffff)
136 return 0;
137 val |= (parts[0] << 24) | (parts[1] << 16);
138 break;
139
140 case 4: /* a.b.c.d -- 8.8.8.8 bits */
141 if (val > 0xff)
142 return 0;
143 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
144 break;
145 }
146 if (addr)
147 addr->s_addr = pg_hton32(val);
148 return 1;
149}
val
long val
Definition informix.c:689
pg_hton32
#define pg_hton32(x)
Definition pg_bswap.h:121
c
char * c
Definition preproc-cursor.c:31
fb
static int fb(int x)
Definition preproc-init.c:92

References fb(), pg_hton32, and val.

Referenced by is_ip_address(), and pq_verify_peer_name_matches_certificate_ip().