diff options
Diffstat (limited to 'src/backend/utils/adt/name.c')
| -rw-r--r-- | src/backend/utils/adt/name.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/src/backend/utils/adt/name.c b/src/backend/utils/adt/name.c new file mode 100644 index 00000000000..1031b5bb49a --- /dev/null +++ b/src/backend/utils/adt/name.c @@ -0,0 +1,198 @@ +/*------------------------------------------------------------------------- + * + * name.c-- + * Functions for the built-in type "name". + * name replaces char16 and is carefully implemented so that it + * is a string of length NAMEDATALEN. DO NOT use hard-coded constants anywhere + * always use NAMEDATALEN as the symbolic constant! - jolly 8/21/95 + * + * + * Copyright (c) 1994, Regents of the University of California + * + * + * IDENTIFICATION + * $Header: /cvsroot/pgsql/src/backend/utils/adt/name.c,v 1.1.1.1 1996/07/09 06:22:04 scrappy Exp $ + * + *------------------------------------------------------------------------- + */ +#include <string.h> +#include "postgres.h" +#include "utils/builtins.h" /* where the declarations go */ +#include "utils/palloc.h" /* where the declarations go */ + +/***************************************************************************** + * USER I/O ROUTINES (none) * + *****************************************************************************/ + + +/* + * namein - converts "..." to internal representation + * + * Note: + * Currently if strlen(s) < NAMEDATALEN, the extra chars are nulls + */ +NameData *namein(char *s) +{ + NameData *result; + + if (s == NULL) + return(NULL); + result = (NameData*) palloc(NAMEDATALEN); + /* always keep it null-padded */ + memset(result->data, 0, NAMEDATALEN); + (void) strncpy(result->data, s, NAMEDATALEN-1); + return(result); +} + +/* + * nameout - converts internal reprsentation to "..." + */ +char *nameout(NameData *s) +{ + if (s == NULL) + return "-"; + else + return pstrdup(s->data); +} + + +/***************************************************************************** + * PUBLIC ROUTINES * + *****************************************************************************/ + +/* + * nameeq - returns 1 iff arguments are equal + * namene - returns 1 iff arguments are not equal + * + * BUGS: + * Assumes that "xy\0\0a" should be equal to "xy\0b". + * If not, can do the comparison backwards for efficiency. + * + * namelt - returns 1 iff a < b + * namele - returns 1 iff a <= b + * namegt - returns 1 iff a < b + * namege - returns 1 iff a <= b + * + */ +int32 nameeq(NameData *arg1, NameData *arg2) +{ + if (!arg1 || !arg2) + return 0; + else + return (strncmp(arg1->data, arg2->data, NAMEDATALEN) == 0); +} + +int32 namene(NameData *arg1, NameData *arg2) +{ + if (arg1 == NULL || arg2 == NULL) + return((int32) 0); + return(strncmp(arg1->data, arg2->data, NAMEDATALEN) != 0); +} + +int32 namelt(NameData *arg1, NameData *arg2) +{ + if (arg1 == NULL || arg2 == NULL) + return((int32) 0); + return((int32) (strncmp(arg1->data, arg2->data, NAMEDATALEN) < 0)); +} + +int32 namele(NameData *arg1, NameData *arg2) +{ + if (arg1 == NULL || arg2 == NULL) + return((int32) 0); + return((int32) (strncmp(arg1->data, arg2->data, NAMEDATALEN) <= 0)); +} + +int32 namegt(NameData *arg1, NameData *arg2) +{ + if (arg1 == NULL || arg2 == NULL) + return((int32) 0); + + return((int32) (strncmp(arg1->data, arg2->data, NAMEDATALEN) > 0)); +} + +int32 namege(NameData *arg1, NameData *arg2) +{ + if (arg1 == NULL || arg2 == NULL) + return((int32) 0); + + return((int32) (strncmp(arg1->data, arg2->data, NAMEDATALEN) >= 0)); +} + + +/* (see char.c for comparison/operation routines) */ + +int namecpy(Name n1, Name n2) +{ + if (!n1 || !n2) + return(-1); + (void) strncpy(n1->data, n2->data, NAMEDATALEN); + return(0); +} + +int namecat(Name n1, Name n2) +{ + return(namestrcat(n1, n2->data)); /* n2 can't be any longer than n1 */ +} + +int namecmp(Name n1, Name n2) +{ + return(strncmp(n1->data, n2->data, NAMEDATALEN)); +} + +int +namestrcpy(Name name, char *str) +{ + if (!name || !str) + return(-1); + memset(name->data, 0, sizeof(NameData)); + (void) strncpy(name->data, str, NAMEDATALEN); + return(0); +} + +int namestrcat(Name name, char *str) +{ + int i; + char *p, *q; + + if (!name || !str) + return(-1); + for (i = 0, p = name->data; i < NAMEDATALEN && *p; ++i, ++p) + ; + for (q = str; i < NAMEDATALEN; ++i, ++p, ++q) { + *p = *q; + if (!*q) + break; + } + return(0); +} + +int +namestrcmp(Name name, char *str) +{ + if (!name && !str) + return(0); + if (!name) + return(-1); /* NULL < anything */ + if (!str) + return(1); /* NULL < anything */ + return(strncmp(name->data, str, NAMEDATALEN)); +} + +/***************************************************************************** + * PRIVATE ROUTINES * + *****************************************************************************/ + +uint32 +NameComputeLength(Name name) +{ + char *charP; + int length; + + for (length = 0, charP = name->data; + length < NAMEDATALEN && *charP != '\0'; + length++, charP++) { + ; + } + return (uint32)length; +} |