Section 3: library functions
strti2.f – Synopsis Functions/Subroutines subroutine strti2 (UPLO, DIAG, N, A, LDA, INFO) STRTI2 computes the inverse of a triangular matrix (unblocked algorithm). Function/Subroutine Documentation subroutine strti2 (characterUPLO, characterDIAG, integerN, real, dimension( lda, * )A, integerLDA, integerINFO) STRTI2 computes the inverse of a triangular matrix (unblocked algorithm). Purpose: STRTI2 computes the inverse of a real upper…
strsyl.f – Synopsis Functions/Subroutines subroutine strsyl (TRANA, TRANB, ISGN, M, N, A, LDA, B, LDB, C, LDC, SCALE, INFO) STRSYL Function/Subroutine Documentation subroutine strsyl (characterTRANA, characterTRANB, integerISGN, integerM, integerN, real, dimension( lda, * )A, integerLDA, real, dimension( ldb, * )B, integerLDB, real, dimension( ldc, * )C, integerLDC, realSCALE, integerINFO) STRSYL Purpose: STRSYL solves the real…
strsv.f – Synopsis Functions/Subroutines subroutine strsv (UPLO, TRANS, DIAG, N, A, LDA, X, INCX) STRSV Function/Subroutine Documentation subroutine strsv (characterUPLO, characterTRANS, characterDIAG, integerN, real, dimension(lda,*)A, integerLDA, real, dimension(*)X, integerINCX) STRSV Purpose: STRSV solves one of the systems of equations A*x = b, or A**T*x = b, where b and x are n element vectors and…
strstr, strcasestr – locate a substring Synopsis #include <string.h> char *strstr(const char *haystack, const char *needle); #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <string.h> char *strcasestr(const char *haystack, const char *needle); Description The strstr() function finds the first occurrence of the substring needle in the string haystack. The terminating null bytes (‘
strspn, strcspn – get length of a prefix substring Synopsis #include <string.h> size_t strspn(const char *s, const char *accept); size_t strcspn(const char *s, const char *reject); Description The strspn() function calculates the length (in bytes) of the initial segment of s which consists entirely of bytes in accept. The strcspn() function calculates the length of…
strsna.f – Synopsis Functions/Subroutines subroutine strsna (JOB, HOWMNY, SELECT, N, T, LDT, VL, LDVL, VR, LDVR, S, SEP, MM, M, WORK, LDWORK, IWORK, INFO) STRSNA Function/Subroutine Documentation subroutine strsna (characterJOB, characterHOWMNY, logical, dimension( * )SELECT, integerN, real, dimension( ldt, * )T, integerLDT, real, dimension( ldvl, * )VL, integerLDVL, real, dimension( ldvr, * )VR, integerLDVR, real,…
strsm.f – Synopsis Functions/Subroutines subroutine strsm (SIDE, UPLO, TRANSA, DIAG, M, N, ALPHA, A, LDA, B, LDB) STRSM Function/Subroutine Documentation subroutine strsm (characterSIDE, characterUPLO, characterTRANSA, characterDIAG, integerM, integerN, realALPHA, real, dimension(lda,*)A, integerLDA, real, dimension(ldb,*)B, integerLDB) STRSM Purpose: STRSM solves one of the matrix equations op( A )*X = alpha*B, or X*op( A ) = alpha*B,…
strsignal, sigdescr_np, sigdescr_np, sys_siglist – return string describing signal Synopsis #include <string.h> char *strsignal(int sig); char *sigdescr_np(int sig); char *sigabbrev_np(int sig); extern const char *const sys_siglist[]; Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigabbrev_np(), sigdescr_np(): _GNU_SOURCE strsignal(): From glibc 2.10 to 2.31: _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _GNU_SOURCE sys_siglist: Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19…
strsep – extract token from string Synopsis #include <string.h> char *strsep(char **stringp, const char *delim); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): strsep(): Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _BSD_SOURCE Description If *stringp is NULL, the strsep() function returns NULL and does nothing else. Otherwise, this function finds the first token in…
strsen.f – Synopsis Functions/Subroutines subroutine strsen (JOB, COMPQ, SELECT, N, T, LDT, Q, LDQ, WR, WI, M, S, SEP, WORK, LWORK, IWORK, LIWORK, INFO) STRSEN Function/Subroutine Documentation subroutine strsen (characterJOB, characterCOMPQ, logical, dimension( * )SELECT, integerN, real, dimension( ldt, * )T, integerLDT, real, dimension( ldq, * )Q, integerLDQ, real, dimension( * )WR, real, dimension( *…
strrfs.f – Synopsis Functions/Subroutines subroutine strrfs (UPLO, TRANS, DIAG, N, NRHS, A, LDA, B, LDB, X, LDX, FERR, BERR, WORK, IWORK, INFO) STRRFS Function/Subroutine Documentation subroutine strrfs (characterUPLO, characterTRANS, characterDIAG, integerN, integerNRHS, real, dimension( lda, * )A, integerLDA, real, dimension( ldb, * )B, integerLDB, real, dimension( ldx, * )X, integerLDX, real, dimension( * )FERR, real,…
strchr, strrchr, strchrnul – locate character in string Synopsis #include <string.h> char *strchr(const char *s, int c); char *strrchr(const char *s, int c); #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <string.h> char *strchrnul(const char *s, int c); Description The strchr() function returns a pointer to the first occurrence of the character c in the string…
strptime – convert a string representation of time to a time tm structure Synopsis #define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <time.h> char *strptime(const char *s, const char *format, struct tm *tm); Description The strptime() function is the converse of strftime(3); it converts the character string pointed to by s to values which are stored…
strpbrk – search a string for any of a set of bytes Synopsis #include <string.h> char *strpbrk(const char *s, const char *accept); Description The strpbrk() function locates the first occurrence in the string s of any of the bytes in the string accept. Return Value The strpbrk() function returns a pointer to the byte in…
strnstr – locate a substring in a string Library Lb libbsd Synopsis In bsd/string.h Ft char * Fn strnstr const char *big const char *little size_t len Description The Fn strnstr function locates the first occurrence of the null-terminated string Fa little in the string Fa big , where not more than Fa len characters…
strnlen – determine the length of a fixed-size string Synopsis #include <string.h> size_t strnlen(const char *s, size_t maxlen); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): strnlen(): Since glibc 2.10: _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _GNU_SOURCE Description The strnlen() function returns the number of bytes in the string pointed to by s, excluding the terminating null…
strneqvcmp – compare two strings with an equivalence mapping Synopsis #include <your-opts.h> cc[…] – o outfile infile.c – lopts[…] int strneqvcmp(char const *str1, char const *str2, int ct); Description Using a character mapping, two strings are compared for "equivalence". Each input character is mapped to a comparison character and the mapped-to characters are compared for…
strdup, strndup, strdupa, strndupa – duplicate a string Synopsis #include <string.h> char *strdup(const char *s); char *strndup(const char *s, size_t n); char *strdupa(const char *s); char *strndupa(const char *s, size_t n); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): strdup(): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE strndup(): Since glibc 2.10: _POSIX_C_SOURCE >= 200809L Before glibc 2.10:…
strdup, strndup, strdupa, strndupa – duplicate a string Synopsis #include <string.h> char *strdup(const char *s); char *strndup(const char *s, size_t n); char *strdupa(const char *s); char *strndupa(const char *s, size_t n); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): strdup(): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE strndup(): Since glibc 2.10: _POSIX_C_SOURCE >= 200809L Before glibc 2.10:…
strcpy, strncpy – copy a string Synopsis #include <string.h> char *strcpy(char *dest, const char *src); char *strncpy(char *dest, const char *src, size_t n); Description The strcpy() function copies the string pointed to by src, including the terminating null byte (‘